Data provided by the Weather Warehouse
T = Trace
N = Not Reported by the Government
.
TmaxF - High Temperature (degrees Fahrenheit)
TminF - Low Temperature (degrees Fahrenheit)
TmeanF - Mean Temperature (degrees Fahrenheit)
PrecipIn - Precipitation (inches)
SnowIn - Snow (inches)
CDD - Cooling Degree Days
HDD - Heating Degree Days
GDD - Growing Degree Days
1957, Dearborn, MI 48123
| Date | TmaxF | TminF | TmeanF | PrcpIn | SnowIn | CDD | HDD | GDD |
| 1/1/1957 | 26 | 13 | 19.5 | 0.00 | 0.00 | 0.0 | 45.5 | 0.0 |
| 1/2/1957 | 29 | 13 | 21.0 | 0.00 | 0.00 | 0.0 | 44.0 | 0.0 |
| 1/3/1957 | 34 | 15 | 24.5 | T | T | 0.0 | 40.5 | 0.0 |
| 1/4/1957 | 35 | N | N | T | T | N | N | N |
| 1/5/1957 | 35 | 22 | 28.5 | 0.00 | 0.00 | 0.0 | 36.5 | 0.0 |
| 1/6/1957 | 32 | 24 | 28.0 | 0.00 | 0.00 | 0.0 | 37.0 | 0.0 |
| 1/7/1957 | 35 | 26 | 30.5 | T | T | 0.0 | 34.5 | 0.0 |
| 1/8/1957 | 33 | 15 | 24.0 | 0.00 | 0.00 | 0.0 | 41.0 | 0.0 |
| 1/9/1957 | 35 | 29 | 32.0 | T | T | 0.0 | 33.0 | 0.0 |
| 1/10/1957 | 33 | 12 | 22.5 | 0.12 | 7.00 | 0.0 | 42.5 | 0.0 |
| 1/11/1957 | 19 | 3 | 11.0 | 0.00 | 0.00 | 0.0 | 54.0 | 0.0 |
| 1/12/1957 | 28 | 13 | 20.5 | 0.00 | 0.00 | 0.0 | 44.5 | 0.0 |
| 1/13/1957 | 28 | 7 | 17.5 | 0.03 | 0.40 | 0.0 | 47.5 | 0.0 |
| 1/14/1957 | 9 | 2 | 5.5 | 0.00 | 0.00 | 0.0 | 59.5 | 0.0 |
| 1/15/1957 | 17 | 4 | 10.5 | 0.00 | 0.00 | 0.0 | 54.5 | 0.0 |
| 1/16/1957 | 15 | 2 | 8.5 | 0.00 | 0.00 | 0.0 | 56.5 | 0.0 |
| 1/17/1957 | 11 | N | N | 0.00 | 0.00 | N | N | N |
| 1/18/1957 | 18 | 3 | 10.5 | T | T | 0.0 | 54.5 | 0.0 |
| 1/19/1957 | 31 | 6 | 18.5 | 0.00 | 0.00 | 0.0 | 46.5 | 0.0 |
| 1/20/1957 | 37 | 27 | 32.0 | T | 0.00 | 0.0 | 33.0 | 0.0 |
| 1/21/1957 | 44 | N | N | T | 0.00 | N | N | N |
| 1/22/1957 | 53 | 42 | 47.5 | 0.44 | N | 0.0 | 17.5 | 0.0 |
| 1/23/1957 | 43 | 11 | 27.0 | 0.20 | N | 0.0 | 38.0 | 0.0 |
| 1/24/1957 | 23 | 2 | 12.5 | 0.00 | 0.00 | 0.0 | 52.5 | 0.0 |
| 1/25/1957 | 25 | 18 | 21.5 | 0.03 | T | 0.0 | 43.5 | 0.0 |
| 1/26/1957 | 24 | 13 | 18.5 | 0.00 | 0.00 | 0.0 | 46.5 | 0.0 |
| 1/27/1957 | 23 | 11 | 17.0 | T | T | 0.0 | 48.0 | 0.0 |
| 1/28/1957 | 24 | 14 | 19.0 | T | T | 0.0 | 46.0 | 0.0 |
| 1/29/1957 | 28 | 15 | 21.5 | 0.22 | N | 0.0 | 43.5 | 0.0 |
| 1/30/1957 | 28 | 17 | 22.5 | T | 0.00 | 0.0 | 42.5 | 0.0 |
| 1/31/1957 | 28 | 11 | 19.5 | T | T | 0.0 | 45.5 | 0.0 |
| 2/1/1957 | 28 | 18 | 23.0 | 0.00 | N | 0.0 | 42.0 | 0.0 |
| 2/2/1957 | 32 | 17 | 24.5 | 0.00 | N | 0.0 | 40.5 | 0.0 |
| 2/3/1957 | 37 | 22 | 29.5 | 0.00 | N | 0.0 | 35.5 | 0.0 |
| 2/4/1957 | 38 | 29 | 33.5 | 0.00 | N | 0.0 | 31.5 | 0.0 |
| 2/5/1957 | 34 | 15 | 24.5 | 0.00 | N | 0.0 | 40.5 | 0.0 |
| 2/6/1957 | 42 | 14 | 28.0 | 0.00 | N | 0.0 | 37.0 | 0.0 |
| 2/7/1957 | 40 | 29 | 34.5 | 0.00 | N | 0.0 | 30.5 | 0.0 |
| 2/8/1957 | 38 | 27 | 32.5 | 0.00 | N | 0.0 | 32.5 | 0.0 |
| 2/9/1957 | 43 | 32 | 37.5 | N | N | 0.0 | 27.5 | 0.0 |
| 2/10/1957 | 42 | 29 | 35.5 | T | N | 0.0 | 29.5 | 0.0 |
| 2/11/1957 | 30 | 17 | 23.5 | 0.02 | N | 0.0 | 41.5 | 0.0 |
| 2/12/1957 | 31 | 18 | 24.5 | 0.06 | N | 0.0 | 40.5 | 0.0 |
| 2/13/1957 | 43 | 19 | 31.0 | T | N | 0.0 | 34.0 | 0.0 |
| 2/14/1957 | 42 | 20 | 31.0 | 0.28 | N | 0.0 | 34.0 | 0.0 |
| 2/15/1957 | 32 | 7 | 19.5 | 0.00 | N | 0.0 | 45.5 | 0.0 |
| 2/16/1957 | 33 | 26 | 29.5 | 0.00 | N | 0.0 | 35.5 | 0.0 |
| 2/17/1957 | 30 | 16 | 23.0 | 0.00 | N | 0.0 | 42.0 | 0.0 |
| 2/18/1957 | 42 | 12 | 27.0 | 0.04 | N | 0.0 | 38.0 | 0.0 |
| 2/19/1957 | 42 | 15 | 28.5 | 0.00 | N | 0.0 | 36.5 | 0.0 |
| 2/20/1957 | 33 | 10 | 21.5 | 0.00 | N | 0.0 | 43.5 | 0.0 |
| 2/21/1957 | 38 | 14 | 26.0 | 0.00 | N | 0.0 | 39.0 | 0.0 |
| 2/22/1957 | 45 | N | N | 0.00 | N | N | N | N |
| 2/23/1957 | 43 | 34 | 38.5 | 0.00 | N | 0.0 | 26.5 | 0.0 |
| 2/24/1957 | 41 | 28 | 34.5 | 0.00 | N | 0.0 | 30.5 | 0.0 |
| 2/25/1957 | 66 | 40 | 53.0 | 0.00 | N | 0.0 | 12.0 | 3.0 |
| 2/26/1957 | 65 | 35 | 50.0 | 0.48 | N | 0.0 | 15.0 | 0.0 |
| 2/27/1957 | 36 | 21 | 28.5 | 0.18 | N | 0.0 | 36.5 | 0.0 |
| 2/28/1957 | 35 | 19 | 27.0 | 0.00 | N | 0.0 | 38.0 | 0.0 |
| 3/1/1957 | 45 | 23 | 34.0 | 0.00 | 0.00 | 0.0 | 31.0 | 0.0 |
| 3/2/1957 | 44 | 21 | 32.5 | T | T | 0.0 | 32.5 | 0.0 |
| 3/3/1957 | 34 | 12 | 23.0 | T | T | 0.0 | 42.0 | 0.0 |
| 3/4/1957 | 33 | 13 | 23.0 | 0.00 | 0.00 | 0.0 | 42.0 | 0.0 |
| 3/5/1957 | 36 | 13 | 24.5 | 0.00 | 0.00 | 0.0 | 40.5 | 0.0 |
| 3/6/1957 | 40 | 18 | 29.0 | 0.00 | 0.00 | 0.0 | 36.0 | 0.0 |
| 3/7/1957 | 40 | 18 | 29.0 | 0.00 | 0.00 | 0.0 | 36.0 | 0.0 |
| 3/8/1957 | 39 | 25 | 32.0 | 0.00 | 0.00 | 0.0 | 33.0 | 0.0 |
| 3/9/1957 | 41 | 22 | 31.5 | 0.00 | 0.00 | 0.0 | 33.5 | 0.0 |
| 3/10/1957 | 42 | N | N | T | 0.00 | N | N | N |
| 3/11/1957 | 50 | N | N | 0.22 | 0.00 | N | N | N |
| 3/12/1957 | 57 | 41 | 49.0 | 0.00 | 0.00 | 0.0 | 16.0 | 0.0 |
| 3/13/1957 | 70 | 40 | 55.0 | 0.00 | 0.00 | 0.0 | 10.0 | 5.0 |
| 3/14/1957 | 71 | 40 | 55.5 | 0.00 | 0.00 | 0.0 | 9.5 | 5.5 |
| 3/15/1957 | 68 | 36 | 52.0 | 0.05 | 0.00 | 0.0 | 13.0 | 2.0 |
| 3/16/1957 | 46 | 32 | 39.0 | 0.00 | 0.00 | 0.0 | 26.0 | 0.0 |
| 3/17/1957 | 49 | 28 | 38.5 | 0.00 | 0.00 | 0.0 | 26.5 | 0.0 |
| 3/18/1957 | 49 | 28 | 38.5 | 0.00 | 0.00 | 0.0 | 26.5 | 0.0 |
| 3/19/1957 | 39 | 28 | 33.5 | 0.37 | 0.00 | 0.0 | 31.5 | 0.0 |
| 3/20/1957 | 37 | 29 | 33.0 | 0.02 | 0.10 | 0.0 | 32.0 | 0.0 |
| 3/21/1957 | 49 | 27 | 38.0 | 0.00 | 0.00 | 0.0 | 27.0 | 0.0 |
| 3/22/1957 | 51 | 33 | 42.0 | 0.00 | 0.00 | 0.0 | 23.0 | 0.0 |
| 3/23/1957 | 62 | 31 | 46.5 | 0.00 | 0.00 | 0.0 | 18.5 | 0.0 |
| 3/24/1957 | 55 | 30 | 42.5 | 0.00 | 0.00 | 0.0 | 22.5 | 0.0 |
| 3/25/1957 | 40 | 27 | 33.5 | 0.00 | 0.00 | 0.0 | 31.5 | 0.0 |
| 3/26/1957 | 37 | 28 | 32.5 | 0.03 | T | 0.0 | 32.5 | 0.0 |
| 3/27/1957 | 41 | 33 | 37.0 | T | 0.00 | 0.0 | 28.0 | 0.0 |
| 3/28/1957 | 48 | 26 | 37.0 | 0.00 | 0.00 | 0.0 | 28.0 | 0.0 |
| 3/29/1957 | 47 | 33 | 40.0 | 0.18 | 0.00 | 0.0 | 25.0 | 0.0 |
| 3/30/1957 | 49 | 28 | 38.5 | 0.00 | 0.00 | 0.0 | 26.5 | 0.0 |
| 3/31/1957 | 52 | 24 | 38.0 | 0.00 | 0.00 | 0.0 | 27.0 | 0.0 |
| 4/1/1957 | 54 | 35 | 44.5 | 0.04 | 0.00 | 0.0 | 20.5 | 0.0 |
| 4/2/1957 | 53 | 32 | 42.5 | 0.04 | 0.00 | 0.0 | 22.5 | 0.0 |
| 4/3/1957 | 43 | 26 | 34.5 | 0.00 | 0.00 | 0.0 | 30.5 | 0.0 |
| 4/4/1957 | 38 | 29 | 33.5 | 0.08 | 1.50 | 0.0 | 31.5 | 0.0 |
| 4/5/1957 | 55 | 37 | 46.0 | 0.24 | 0.00 | 0.0 | 19.0 | 0.0 |
| 4/6/1957 | 56 | 34 | 45.0 | 0.52 | 0.00 | 0.0 | 20.0 | 0.0 |
| 4/7/1957 | 40 | 32 | 36.0 | 0.05 | T | 0.0 | 29.0 | 0.0 |
| 4/8/1957 | 39 | 33 | 36.0 | T | T | 0.0 | 29.0 | 0.0 |
| 4/9/1957 | 40 | 26 | 33.0 | T | T | 0.0 | 32.0 | 0.0 |
| 4/10/1957 | 48 | 27 | 37.5 | 0.00 | 0.00 | 0.0 | 27.5 | 0.0 |
| 4/11/1957 | 53 | 37 | 45.0 | 0.00 | 0.00 | 0.0 | 20.0 | 0.0 |
| 4/12/1957 | 50 | 25 | 37.5 | T | T | 0.0 | 27.5 | 0.0 |
| 4/13/1957 | 39 | 26 | 32.5 | T | T | 0.0 | 32.5 | 0.0 |
| 4/14/1957 | 45 | 28 | 36.5 | 0.00 | 0.00 | 0.0 | 28.5 | 0.0 |
| 4/15/1957 | 51 | 27 | 39.0 | 0.00 | 0.00 | 0.0 | 26.0 | 0.0 |
| 4/16/1957 | 54 | 38 | 46.0 | 0.00 | 0.00 | 0.0 | 19.0 | 0.0 |
| 4/17/1957 | 53 | 41 | 47.0 | 0.18 | 0.00 | 0.0 | 18.0 | 0.0 |
| 4/18/1957 | 57 | 47 | 52.0 | 0.18 | 0.00 | 0.0 | 13.0 | 2.0 |
| 4/19/1957 | 75 | 48 | 61.5 | 0.00 | 0.00 | 0.0 | 3.5 | 11.5 |
| 4/20/1957 | 82 | 57 | 69.5 | 0.00 | 0.00 | 4.5 | 0.0 | 19.5 |
| 4/21/1957 | 79 | N | N | 0.00 | 0.00 | N | N | N |
| 4/22/1957 | 70 | 42 | 56.0 | 0.00 | 0.00 | 0.0 | 9.0 | 6.0 |
| 4/23/1957 | 79 | 53 | 66.0 | T | 0.00 | 1.0 | 0.0 | 16.0 |
| 4/24/1957 | 82 | 57 | 69.5 | 0.40 | 0.00 | 4.5 | 0.0 | 19.5 |
| 4/25/1957 | 81 | 56 | 68.5 | 0.63 | 0.00 | 3.5 | 0.0 | 18.5 |
| 4/26/1957 | 82 | 58 | 70.0 | T | 0.00 | 5.0 | 0.0 | 20.0 |
| 4/27/1957 | 82 | 60 | 71.0 | 0.96 | 0.00 | 6.0 | 0.0 | 21.0 |
| 4/28/1957 | 72 | 54 | 63.0 | 0.00 | 0.00 | 0.0 | 2.0 | 13.0 |
| 4/29/1957 | 75 | 41 | 58.0 | 0.00 | 0.00 | 0.0 | 7.0 | 8.0 |
| 4/30/1957 | 75 | 47 | 61.0 | 0.00 | 0.00 | 0.0 | 4.0 | 11.0 |
| 5/1/1957 | 83 | 48 | 65.5 | 0.00 | 0.00 | 0.5 | 0.0 | 15.5 |
| 5/2/1957 | 73 | 41 | 57.0 | 0.00 | 0.00 | 0.0 | 8.0 | 7.0 |
| 5/3/1957 | 53 | 34 | 43.5 | 0.00 | 0.00 | 0.0 | 21.5 | 0.0 |
| 5/4/1957 | 55 | 36 | 45.5 | 0.00 | 0.00 | 0.0 | 19.5 | 0.0 |
| 5/5/1957 | 60 | 35 | 47.5 | 0.00 | 0.00 | 0.0 | 17.5 | 0.0 |
| 5/6/1957 | 71 | 39 | 55.0 | 0.00 | 0.00 | 0.0 | 10.0 | 5.0 |
| 5/7/1957 | 78 | 47 | 62.5 | 0.00 | 0.00 | 0.0 | 2.5 | 12.5 |
| 5/8/1957 | 82 | 50 | 66.0 | 0.00 | 0.00 | 1.0 | 0.0 | 16.0 |
| 5/9/1957 | 80 | 59 | 69.5 | 0.03 | 0.00 | 4.5 | 0.0 | 19.5 |
| 5/10/1957 | 80 | 48 | 64.0 | 0.10 | 0.00 | 0.0 | 1.0 | 14.0 |
| 5/11/1957 | 64 | 48 | 56.0 | 0.12 | 0.00 | 0.0 | 9.0 | 6.0 |
| 5/12/1957 | 67 | 52 | 59.5 | 0.58 | 0.00 | 0.0 | 5.5 | 9.5 |
| 5/13/1957 | 75 | 55 | 65.0 | T | 0.00 | 0.0 | 0.0 | 15.0 |
| 5/14/1957 | 75 | 57 | 66.0 | 0.25 | 0.00 | 1.0 | 0.0 | 16.0 |
| 5/15/1957 | 74 | 55 | 64.5 | 0.00 | 0.00 | 0.0 | 0.5 | 14.5 |
| 5/16/1957 | 56 | 36 | 46.0 | 0.00 | 0.00 | 0.0 | 19.0 | 0.0 |
| 5/17/1957 | 55 | 37 | 46.0 | 0.08 | 0.00 | 0.0 | 19.0 | 0.0 |
| 5/18/1957 | 49 | 45 | 47.0 | 0.33 | 0.00 | 0.0 | 18.0 | 0.0 |
| 5/19/1957 | 50 | 45 | 47.5 | 0.89 | 0.00 | 0.0 | 17.5 | 0.0 |
| 5/20/1957 | 51 | 45 | 48.0 | 0.13 | 0.00 | 0.0 | 17.0 | 0.0 |
| 5/21/1957 | 57 | 46 | 51.5 | 0.00 | 0.00 | 0.0 | 13.5 | 1.5 |
| 5/22/1957 | 80 | 55 | 67.5 | 0.00 | 0.00 | 2.5 | 0.0 | 17.5 |
| 5/23/1957 | 79 | 60 | 69.5 | 0.19 | 0.00 | 4.5 | 0.0 | 19.5 |
| 5/24/1957 | 71 | 46 | 58.5 | 0.00 | 0.00 | 0.0 | 6.5 | 8.5 |
| 5/25/1957 | 71 | 50 | 60.5 | 0.00 | 0.00 | 0.0 | 4.5 | 10.5 |
| 5/26/1957 | 78 | 59 | 68.5 | 0.10 | 0.00 | 3.5 | 0.0 | 18.5 |
| 5/27/1957 | 77 | 52 | 64.5 | 0.00 | 0.00 | 0.0 | 0.5 | 14.5 |
| 5/28/1957 | 68 | 42 | 55.0 | 0.00 | 0.00 | 0.0 | 10.0 | 5.0 |
| 5/29/1957 | 71 | 47 | 59.0 | 0.00 | 0.00 | 0.0 | 6.0 | 9.0 |
| 5/30/1957 | 79 | 48 | 63.5 | 0.00 | 0.00 | 0.0 | 1.5 | 13.5 |
| 5/31/1957 | 78 | 57 | 67.5 | 0.00 | 0.00 | 2.5 | 0.0 | 17.5 |
| 6/1/1957 | 76 | 59 | 67.5 | T | 0.00 | 2.5 | 0.0 | 17.5 |
| 6/2/1957 | 65 | 48 | 56.5 | 0.00 | 0.00 | 0.0 | 8.5 | 6.5 |
| 6/3/1957 | 73 | 39 | 56.0 | 0.00 | 0.00 | 0.0 | 9.0 | 6.0 |
| 6/4/1957 | 80 | 48 | 64.0 | 0.00 | 0.00 | 0.0 | 1.0 | 14.0 |
| 6/5/1957 | 82 | 52 | 67.0 | 0.00 | 0.00 | 2.0 | 0.0 | 17.0 |
| 6/6/1957 | 82 | 55 | 68.5 | 0.04 | 0.00 | 3.5 | 0.0 | 18.5 |
| 6/7/1957 | 80 | 51 | 65.5 | T | 0.00 | 0.5 | 0.0 | 15.5 |
| 6/8/1957 | 70 | 44 | 57.0 | T | 0.00 | 0.0 | 8.0 | 7.0 |
| 6/9/1957 | 70 | 51 | 60.5 | 0.00 | 0.00 | 0.0 | 4.5 | 10.5 |
| 6/10/1957 | 82 | 53 | 67.5 | 0.00 | 0.00 | 2.5 | 0.0 | 17.5 |
| 6/11/1957 | 83 | 68 | 75.5 | 0.24 | 0.00 | 10.5 | 0.0 | 25.5 |
| 6/12/1957 | 77 | 65 | 71.0 | 0.00 | 0.00 | 6.0 | 0.0 | 21.0 |
| 6/13/1957 | 81 | 59 | 70.0 | 0.87 | 0.00 | 5.0 | 0.0 | 20.0 |
| 6/14/1957 | 85 | 66 | 75.5 | 0.29 | 0.00 | 10.5 | 0.0 | 25.5 |
| 6/15/1957 | 86 | 70 | 78.0 | 0.00 | 0.00 | 13.0 | 0.0 | 28.0 |
| 6/16/1957 | 92 | 68 | 80.0 | 0.02 | 0.00 | 15.0 | 0.0 | 30.0 |
| 6/17/1957 | 92 | 70 | 81.0 | 0.00 | 0.00 | 16.0 | 0.0 | 31.0 |
| 6/18/1957 | 90 | 73 | 81.5 | 0.17 | 0.00 | 16.5 | 0.0 | 31.5 |
| 6/19/1957 | 88 | 61 | 74.5 | T | 0.00 | 9.5 | 0.0 | 24.5 |
| 6/20/1957 | 86 | 57 | 71.5 | 0.00 | 0.00 | 6.5 | 0.0 | 21.5 |
| 6/21/1957 | 86 | 64 | 75.0 | 0.00 | 0.00 | 10.0 | 0.0 | 25.0 |
| 6/22/1957 | 90 | 68 | 79.0 | 0.00 | 0.00 | 14.0 | 0.0 | 29.0 |
| 6/23/1957 | 87 | 66 | 76.5 | 0.00 | 0.00 | 11.5 | 0.0 | 26.5 |
| 6/24/1957 | 89 | 57 | 73.0 | 0.30 | 0.00 | 8.0 | 0.0 | 23.0 |
| 6/25/1957 | 75 | 59 | 67.0 | T | 0.00 | 2.0 | 0.0 | 17.0 |
| 6/26/1957 | 88 | N | N | 0.00 | 0.00 | N | N | N |
| 6/27/1957 | 81 | 65 | 73.0 | 0.34 | 0.00 | 8.0 | 0.0 | 23.0 |
| 6/28/1957 | 74 | 65 | 69.5 | 0.40 | 0.00 | 4.5 | 0.0 | 19.5 |
| 6/29/1957 | 80 | 60 | 70.0 | 0.05 | 0.00 | 5.0 | 0.0 | 20.0 |
| 6/30/1957 | 80 | 61 | 70.5 | 0.00 | 0.00 | 5.5 | 0.0 | 20.5 |
| 7/1/1957 | 80 | 55 | 67.5 | 0.04 | 0.00 | 2.5 | 0.0 | 17.5 |
| 7/2/1957 | 83 | 54 | 68.5 | 0.00 | 0.00 | 3.5 | 0.0 | 18.5 |
| 7/3/1957 | 89 | 72 | 80.5 | 0.00 | 0.00 | 15.5 | 0.0 | 30.5 |
| 7/4/1957 | 86 | 69 | 77.5 | 0.00 | 0.00 | 12.5 | 0.0 | 27.5 |
| 7/5/1957 | 80 | 63 | 71.5 | 0.00 | 0.00 | 6.5 | 0.0 | 21.5 |
| 7/6/1957 | 81 | 57 | 69.0 | 0.30 | 0.00 | 4.0 | 0.0 | 19.0 |
| 7/7/1957 | 88 | 66 | 77.0 | 0.00 | 0.00 | 12.0 | 0.0 | 27.0 |
| 7/8/1957 | 85 | 68 | 76.5 | 3.98 | 0.00 | 11.5 | 0.0 | 26.5 |
| 7/9/1957 | 81 | 67 | 74.0 | 0.00 | 0.00 | 9.0 | 0.0 | 24.0 |
| 7/10/1957 | 80 | 53 | 66.5 | 0.00 | 0.00 | 1.5 | 0.0 | 16.5 |
| 7/11/1957 | 77 | 60 | 68.5 | 2.00 | 0.00 | 3.5 | 0.0 | 18.5 |
| 7/12/1957 | 85 | 61 | 73.0 | 0.15 | 0.00 | 8.0 | 0.0 | 23.0 |
| 7/13/1957 | 87 | 69 | 78.0 | 0.52 | 0.00 | 13.0 | 0.0 | 28.0 |
| 7/14/1957 | 88 | 62 | 75.0 | 0.00 | 0.00 | 10.0 | 0.0 | 25.0 |
| 7/15/1957 | 87 | 57 | 72.0 | 0.00 | 0.00 | 7.0 | 0.0 | 22.0 |
| 7/16/1957 | 88 | 51 | 69.5 | 0.00 | 0.00 | 4.5 | 0.0 | 19.5 |
| 7/17/1957 | 80 | 60 | 70.0 | 0.00 | 0.00 | 5.0 | 0.0 | 20.0 |
| 7/18/1957 | 84 | 58 | 71.0 | 0.00 | 0.00 | 6.0 | 0.0 | 21.0 |
| 7/19/1957 | 92 | 60 | 76.0 | 0.00 | 0.00 | 11.0 | 0.0 | 26.0 |
| 7/20/1957 | 94 | 66 | 80.0 | 0.00 | 0.00 | 15.0 | 0.0 | 30.0 |
| 7/21/1957 | 94 | 74 | 84.0 | 0.00 | 0.00 | 19.0 | 0.0 | 34.0 |
| 7/22/1957 | 93 | 70 | 81.5 | 0.55 | 0.00 | 16.5 | 0.0 | 31.5 |
| 7/23/1957 | 73 | 61 | 67.0 | 0.24 | 0.00 | 2.0 | 0.0 | 17.0 |
| 7/24/1957 | 76 | 55 | 65.5 | 0.00 | 0.00 | 0.5 | 0.0 | 15.5 |
| 7/25/1957 | 79 | 54 | 66.5 | 0.00 | 0.00 | 1.5 | 0.0 | 16.5 |
| 7/26/1957 | 78 | 63 | 70.5 | 0.00 | 0.00 | 5.5 | 0.0 | 20.5 |
| 7/27/1957 | 84 | 62 | 73.0 | 0.00 | 0.00 | 8.0 | 0.0 | 23.0 |
| 7/28/1957 | 88 | 63 | 75.5 | 0.00 | 0.00 | 10.5 | 0.0 | 25.5 |
| 7/29/1957 | 91 | 65 | 78.0 | 0.00 | 0.00 | 13.0 | 0.0 | 28.0 |
| 7/30/1957 | 92 | 72 | 82.0 | 0.00 | 0.00 | 17.0 | 0.0 | 32.0 |
| 7/31/1957 | 90 | 65 | 77.5 | 0.00 | 0.00 | 12.5 | 0.0 | 27.5 |
| 8/1/1957 | 85 | 62 | 73.5 | 0.00 | 0.00 | 8.5 | 0.0 | 23.5 |
| 8/2/1957 | 90 | 64 | 77.0 | 0.00 | 0.00 | 12.0 | 0.0 | 27.0 |
| 8/3/1957 | 91 | 73 | 82.0 | 0.37 | 0.00 | 17.0 | 0.0 | 32.0 |
| 8/4/1957 | 80 | 61 | 70.5 | 0.03 | 0.00 | 5.5 | 0.0 | 20.5 |
| 8/5/1957 | 75 | 50 | 62.5 | 0.00 | 0.00 | 0.0 | 2.5 | 12.5 |
| 8/6/1957 | 80 | 54 | 67.0 | 0.00 | 0.00 | 2.0 | 0.0 | 17.0 |
| 8/7/1957 | 83 | 56 | 69.5 | 0.00 | 0.00 | 4.5 | 0.0 | 19.5 |
| 8/8/1957 | 87 | 68 | 77.5 | 0.00 | 0.00 | 12.5 | 0.0 | 27.5 |
| 8/9/1957 | 90 | 72 | 81.0 | 0.00 | 0.00 | 16.0 | 0.0 | 31.0 |
| 8/10/1957 | 87 | 69 | 78.0 | 0.00 | 0.00 | 13.0 | 0.0 | 28.0 |
| 8/11/1957 | 91 | 65 | 78.0 | 0.00 | 0.00 | 13.0 | 0.0 | 28.0 |
| 8/12/1957 | 89 | 63 | 76.0 | 0.00 | 0.00 | 11.0 | 0.0 | 26.0 |
| 8/13/1957 | 77 | 60 | 68.5 | 0.00 | 0.00 | 3.5 | 0.0 | 18.5 |
| 8/14/1957 | 87 | 69 | 78.0 | 0.05 | 0.00 | 13.0 | 0.0 | 28.0 |
| 8/15/1957 | 88 | 65 | 76.5 | T | 0.00 | 11.5 | 0.0 | 26.5 |
| 8/16/1957 | 88 | 58 | 73.0 | 0.00 | 0.00 | 8.0 | 0.0 | 23.0 |
| 8/17/1957 | 79 | 55 | 67.0 | 0.00 | 0.00 | 2.0 | 0.0 | 17.0 |
| 8/18/1957 | 79 | 61 | 70.0 | 0.00 | 0.00 | 5.0 | 0.0 | 20.0 |
| 8/19/1957 | 80 | 46 | 63.0 | 0.00 | 0.00 | 0.0 | 2.0 | 13.0 |
| 8/20/1957 | 81 | 56 | 68.5 | 0.00 | 0.00 | 3.5 | 0.0 | 18.5 |
| 8/21/1957 | 81 | 57 | 69.0 | 0.00 | 0.00 | 4.0 | 0.0 | 19.0 |
| 8/22/1957 | 79 | 53 | 66.0 | T | 0.00 | 1.0 | 0.0 | 16.0 |
| 8/23/1957 | 84 | 51 | 67.5 | 0.00 | 0.00 | 2.5 | 0.0 | 17.5 |
| 8/24/1957 | 89 | 68 | 78.5 | 0.69 | 0.00 | 13.5 | 0.0 | 28.5 |
| 8/25/1957 | 74 | 60 | 67.0 | 0.00 | 0.00 | 2.0 | 0.0 | 17.0 |
| 8/26/1957 | 82 | 54 | 68.0 | 0.00 | 0.00 | 3.0 | 0.0 | 18.0 |
| 8/27/1957 | 82 | 56 | 69.0 | 0.00 | 0.00 | 4.0 | 0.0 | 19.0 |
| 8/28/1957 | 68 | 55 | 61.5 | 0.11 | 0.00 | 0.0 | 3.5 | 11.5 |
| 8/29/1957 | 78 | 58 | 68.0 | 0.48 | 0.00 | 3.0 | 0.0 | 18.0 |
| 8/30/1957 | 78 | 65 | 71.5 | 0.16 | 0.00 | 6.5 | 0.0 | 21.5 |
| 8/31/1957 | 75 | 64 | 69.5 | 0.02 | 0.00 | 4.5 | 0.0 | 19.5 |
| 9/1/1957 | 83 | 63 | 73.0 | 0.00 | 0.00 | 8.0 | 0.0 | 23.0 |
| 9/2/1957 | 87 | 67 | 77.0 | 0.00 | 0.00 | 12.0 | 0.0 | 27.0 |
| 9/3/1957 | 83 | 66 | 74.5 | 0.07 | 0.00 | 9.5 | 0.0 | 24.5 |
| 9/4/1957 | 82 | 56 | 69.0 | 0.05 | 0.00 | 4.0 | 0.0 | 19.0 |
| 9/5/1957 | 69 | 45 | 57.0 | 0.00 | 0.00 | 0.0 | 8.0 | 7.0 |
| 9/6/1957 | 72 | 47 | 59.5 | 0.00 | 0.00 | 0.0 | 5.5 | 9.5 |
| 9/7/1957 | 72 | 52 | 62.0 | 0.00 | 0.00 | 0.0 | 3.0 | 12.0 |
| 9/8/1957 | 74 | 47 | 60.5 | 0.00 | 0.00 | 0.0 | 4.5 | 10.5 |
| 9/9/1957 | 72 | 48 | 60.0 | 0.00 | 0.00 | 0.0 | 5.0 | 10.0 |
| 9/10/1957 | 71 | 62 | 66.5 | 0.54 | 0.00 | 1.5 | 0.0 | 16.5 |
| 9/11/1957 | 77 | 59 | 68.0 | T | 0.00 | 3.0 | 0.0 | 18.0 |
| 9/12/1957 | 77 | 65 | 71.0 | 0.15 | 0.00 | 6.0 | 0.0 | 21.0 |
| 9/13/1957 | 74 | 69 | 71.5 | 0.13 | 0.00 | 6.5 | 0.0 | 21.5 |
| 9/14/1957 | 75 | 53 | 64.0 | 0.00 | 0.00 | 0.0 | 1.0 | 14.0 |
| 9/15/1957 | 81 | 61 | 71.0 | 0.15 | 0.00 | 6.0 | 0.0 | 21.0 |
| 9/16/1957 | 75 | 60 | 67.5 | 1.03 | 0.00 | 2.5 | 0.0 | 17.5 |
| 9/17/1957 | 72 | 46 | 59.0 | 0.00 | 0.00 | 0.0 | 6.0 | 9.0 |
| 9/18/1957 | 77 | 49 | 63.0 | 0.00 | 0.00 | 0.0 | 2.0 | 13.0 |
| 9/19/1957 | 83 | 63 | 73.0 | 0.00 | 0.00 | 8.0 | 0.0 | 23.0 |
| 9/20/1957 | 80 | 64 | 72.0 | 1.03 | 0.00 | 7.0 | 0.0 | 22.0 |
| 9/21/1957 | 78 | 64 | 71.0 | 0.14 | 0.00 | 6.0 | 0.0 | 21.0 |
| 9/22/1957 | 77 | 58 | 67.5 | 0.22 | 0.00 | 2.5 | 0.0 | 17.5 |
| 9/23/1957 | 66 | 52 | 59.0 | 0.02 | 0.00 | 0.0 | 6.0 | 9.0 |
| 9/24/1957 | 65 | 39 | 52.0 | 0.00 | 0.00 | 0.0 | 13.0 | 2.0 |
| 9/25/1957 | 73 | 49 | 61.0 | 0.00 | 0.00 | 0.0 | 4.0 | 11.0 |
| 9/26/1957 | 73 | 47 | 60.0 | 0.00 | 0.00 | 0.0 | 5.0 | 10.0 |
| 9/27/1957 | 58 | 34 | 46.0 | 0.00 | 0.00 | 0.0 | 19.0 | 0.0 |
| 9/28/1957 | 60 | 34 | 47.0 | 0.00 | 0.00 | 0.0 | 18.0 | 0.0 |
| 9/29/1957 | 68 | 39 | 53.5 | 0.00 | 0.00 | 0.0 | 11.5 | 3.5 |
| 9/30/1957 | 74 | 38 | 56.0 | 0.00 | 0.00 | 0.0 | 9.0 | 6.0 |
| 10/1/1957 | 73 | 50 | 61.5 | 0.00 | 0.00 | 0.0 | 3.5 | 11.5 |
| 10/2/1957 | 70 | 43 | 56.5 | 0.00 | 0.00 | 0.0 | 8.5 | 6.5 |
| 10/3/1957 | 68 | 41 | 54.5 | 0.00 | 0.00 | 0.0 | 10.5 | 4.5 |
| 10/4/1957 | 62 | 39 | 50.5 | 0.00 | 0.00 | 0.0 | 14.5 | 0.5 |
| 10/5/1957 | 64 | 42 | 53.0 | 0.00 | 0.00 | 0.0 | 12.0 | 3.0 |
| 10/6/1957 | 66 | 43 | 54.5 | 0.00 | 0.00 | 0.0 | 10.5 | 4.5 |
| 10/7/1957 | 67 | 50 | 58.5 | 0.00 | 0.00 | 0.0 | 6.5 | 8.5 |
| 10/8/1957 | 72 | 48 | 60.0 | 0.00 | 0.00 | 0.0 | 5.0 | 10.0 |
| 10/9/1957 | 70 | 44 | 57.0 | 0.00 | 0.00 | 0.0 | 8.0 | 7.0 |
| 10/10/1957 | 66 | 41 | 53.5 | 0.00 | 0.00 | 0.0 | 11.5 | 3.5 |
| 10/11/1957 | 53 | 44 | 48.5 | 0.00 | 0.00 | 0.0 | 16.5 | 0.0 |
| 10/12/1957 | 59 | 32 | 45.5 | 0.00 | 0.00 | 0.0 | 19.5 | 0.0 |
| 10/13/1957 | 61 | 32 | 46.5 | 0.00 | 0.00 | 0.0 | 18.5 | 0.0 |
| 10/14/1957 | 65 | 34 | 49.5 | 0.00 | 0.00 | 0.0 | 15.5 | 0.0 |
| 10/15/1957 | 69 | 40 | 54.5 | 0.00 | 0.00 | 0.0 | 10.5 | 4.5 |
| 10/16/1957 | 66 | 57 | 61.5 | 0.36 | 0.00 | 0.0 | 3.5 | 11.5 |
| 10/17/1957 | 66 | 59 | 62.5 | 0.86 | 0.00 | 0.0 | 2.5 | 12.5 |
| 10/18/1957 | 63 | 44 | 53.5 | 0.00 | 0.00 | 0.0 | 11.5 | 3.5 |
| 10/19/1957 | 54 | 38 | 46.0 | 0.00 | 0.00 | 0.0 | 19.0 | 0.0 |
| 10/20/1957 | 63 | 37 | 50.0 | 0.00 | 0.00 | 0.0 | 15.0 | 0.0 |
| 10/21/1957 | 62 | 35 | 48.5 | 0.00 | 0.00 | 0.0 | 16.5 | 0.0 |
| 10/22/1957 | 60 | 48 | 54.0 | T | 0.00 | 0.0 | 11.0 | 4.0 |
| 10/23/1957 | 59 | 55 | 57.0 | 1.30 | 0.00 | 0.0 | 8.0 | 7.0 |
| 10/24/1957 | 60 | 41 | 50.5 | 0.89 | 0.00 | 0.0 | 14.5 | 0.5 |
| 10/25/1957 | 44 | 30 | 37.0 | 0.00 | 0.00 | 0.0 | 28.0 | 0.0 |
| 10/26/1957 | 42 | 29 | 35.5 | 0.00 | 0.00 | 0.0 | 29.5 | 0.0 |
| 10/27/1957 | 44 | 33 | 38.5 | 0.00 | 0.00 | 0.0 | 26.5 | 0.0 |
| 10/28/1957 | 58 | 31 | 44.5 | 0.00 | 0.00 | 0.0 | 20.5 | 0.0 |
| 10/29/1957 | 58 | 34 | 46.0 | 0.00 | 0.00 | 0.0 | 19.0 | 0.0 |
| 10/30/1957 | 54 | 43 | 48.5 | 0.03 | 0.00 | 0.0 | 16.5 | 0.0 |
| 10/31/1957 | 58 | 41 | 49.5 | 0.00 | 0.00 | 0.0 | 15.5 | 0.0 |
| 11/1/1957 | 58 | 37 | 47.5 | T | 0.00 | 0.0 | 17.5 | 0.0 |
| 11/2/1957 | 58 | 39 | 48.5 | 0.00 | 0.00 | 0.0 | 16.5 | 0.0 |
| 11/3/1957 | 59 | 41 | 50.0 | 0.00 | 0.00 | 0.0 | 15.0 | 0.0 |
| 11/4/1957 | 55 | 43 | 49.0 | 0.00 | 0.00 | 0.0 | 16.0 | 0.0 |
| 11/5/1957 | 49 | 41 | 45.0 | T | 0.00 | 0.0 | 20.0 | 0.0 |
| 11/6/1957 | 52 | 31 | 41.5 | 0.00 | 0.00 | 0.0 | 23.5 | 0.0 |
| 11/7/1957 | 51 | 33 | 42.0 | 0.00 | 0.00 | 0.0 | 23.0 | 0.0 |
| 11/8/1957 | 55 | 39 | 47.0 | 0.52 | 0.00 | 0.0 | 18.0 | 0.0 |
| 11/9/1957 | 45 | 27 | 36.0 | T | T | 0.0 | 29.0 | 0.0 |
| 11/10/1957 | 36 | 23 | 29.5 | 0.00 | 0.00 | 0.0 | 35.5 | 0.0 |
| 11/11/1957 | 46 | 25 | 35.5 | 0.00 | 0.00 | 0.0 | 29.5 | 0.0 |
| 11/12/1957 | 51 | 28 | 39.5 | 0.00 | 0.00 | 0.0 | 25.5 | 0.0 |
| 11/13/1957 | 48 | 40 | 44.0 | 0.11 | 0.00 | 0.0 | 21.0 | 0.0 |
| 11/14/1957 | 60 | 47 | 53.5 | 0.92 | 0.00 | 0.0 | 11.5 | 3.5 |
| 11/15/1957 | 54 | 46 | 50.0 | 0.00 | 0.00 | 0.0 | 15.0 | 0.0 |
| 11/16/1957 | 62 | 47 | 54.5 | 0.00 | 0.00 | 0.0 | 10.5 | 4.5 |
| 11/17/1957 | 58 | 39 | 48.5 | 0.00 | 0.00 | 0.0 | 16.5 | 0.0 |
| 11/18/1957 | 50 | 41 | 45.5 | 0.07 | 0.00 | 0.0 | 19.5 | 0.0 |
| 11/19/1957 | 60 | 34 | 47.0 | T | 0.00 | 0.0 | 18.0 | 0.0 |
| 11/20/1957 | 43 | 31 | 37.0 | 0.00 | 0.00 | 0.0 | 28.0 | 0.0 |
| 11/21/1957 | 42 | 32 | 37.0 | T | 0.00 | 0.0 | 28.0 | 0.0 |
| 11/22/1957 | 35 | 28 | 31.5 | 0.00 | 0.00 | 0.0 | 33.5 | 0.0 |
| 11/23/1957 | 41 | 24 | 32.5 | 0.00 | 0.00 | 0.0 | 32.5 | 0.0 |
| 11/24/1957 | 44 | 34 | 39.0 | 0.00 | 0.00 | 0.0 | 26.0 | 0.0 |
| 11/25/1957 | 35 | 20 | 27.5 | 0.00 | 0.00 | 0.0 | 37.5 | 0.0 |
| 11/26/1957 | 37 | 27 | 32.0 | T | 0.00 | 0.0 | 33.0 | 0.0 |
| 11/27/1957 | 58 | 28 | 43.0 | 0.00 | 0.00 | 0.0 | 22.0 | 0.0 |
| 11/28/1957 | 56 | 45 | 50.5 | 0.29 | 0.00 | 0.0 | 14.5 | 0.5 |
| 11/29/1957 | 47 | 38 | 42.5 | 0.00 | 0.00 | 0.0 | 22.5 | 0.0 |
| 11/30/1957 | 39 | 20 | 29.5 | T | T | 0.0 | 35.5 | 0.0 |
| 12/1/1957 | 44 | 20 | 32.0 | 0.00 | 0.00 | 0.0 | 33.0 | 0.0 |
| 12/2/1957 | 43 | 30 | 36.5 | 0.00 | 0.00 | 0.0 | 28.5 | 0.0 |
| 12/3/1957 | 35 | 22 | 28.5 | 0.00 | 0.00 | 0.0 | 36.5 | 0.0 |
| 12/4/1957 | 36 | 20 | 28.0 | 0.00 | 0.00 | 0.0 | 37.0 | 0.0 |
| 12/5/1957 | 34 | 22 | 28.0 | 0.00 | 0.00 | 0.0 | 37.0 | 0.0 |
| 12/6/1957 | 54 | 29 | 41.5 | 0.10 | 0.00 | 0.0 | 23.5 | 0.0 |
| 12/7/1957 | 53 | 29 | 41.0 | 0.40 | N | 0.0 | 24.0 | 0.0 |
| 12/8/1957 | 32 | 24 | 28.0 | 0.00 | 0.00 | 0.0 | 37.0 | 0.0 |
| 12/9/1957 | 31 | 17 | 24.0 | 0.00 | 0.00 | 0.0 | 41.0 | 0.0 |
| 12/10/1957 | 33 | 27 | 30.0 | T | T | 0.0 | 35.0 | 0.0 |
| 12/11/1957 | 30 | 10 | 20.0 | T | T | 0.0 | 45.0 | 0.0 |
| 12/12/1957 | 22 | 9 | 15.5 | 0.00 | 0.00 | 0.0 | 49.5 | 0.0 |
| 12/13/1957 | 38 | 17 | 27.5 | T | T | 0.0 | 37.5 | 0.0 |
| 12/14/1957 | 42 | 31 | 36.5 | 0.00 | 0.00 | 0.0 | 28.5 | 0.0 |
| 12/15/1957 | 40 | 21 | 30.5 | T | 0.00 | 0.0 | 34.5 | 0.0 |
| 12/16/1957 | 42 | 34 | 38.0 | 0.00 | 0.00 | 0.0 | 27.0 | 0.0 |
| 12/17/1957 | 39 | 25 | 32.0 | 0.00 | 0.00 | 0.0 | 33.0 | 0.0 |
| 12/18/1957 | 48 | 32 | 40.0 | 0.35 | 0.00 | 0.0 | 25.0 | 0.0 |
| 12/19/1957 | 57 | 42 | 49.5 | 0.08 | 0.00 | 0.0 | 15.5 | 0.0 |
| 12/20/1957 | 55 | 43 | 49.0 | 0.61 | 0.00 | 0.0 | 16.0 | 0.0 |
| 12/21/1957 | 55 | 36 | 45.5 | T | 0.00 | 0.0 | 19.5 | 0.0 |
| 12/22/1957 | 53 | 31 | 42.0 | 0.00 | 0.00 | 0.0 | 23.0 | 0.0 |
| 12/23/1957 | 55 | 38 | 46.5 | 0.00 | 0.00 | 0.0 | 18.5 | 0.0 |
| 12/24/1957 | 55 | 31 | 43.0 | 0.00 | 0.00 | 0.0 | 22.0 | 0.0 |
| 12/25/1957 | 38 | 36 | 37.0 | 0.02 | 0.00 | 0.0 | 28.0 | 0.0 |
| 12/26/1957 | 45 | 35 | 40.0 | 0.29 | 0.00 | 0.0 | 25.0 | 0.0 |
| 12/27/1957 | 42 | 25 | 33.5 | 0.00 | 0.00 | 0.0 | 31.5 | 0.0 |
| 12/28/1957 | 38 | 33 | 35.5 | 0.03 | 0.00 | 0.0 | 29.5 | 0.0 |
| 12/29/1957 | 38 | 25 | 31.5 | 0.00 | 0.00 | 0.0 | 33.5 | 0.0 |
| 12/30/1957 | 45 | 31 | 38.0 | 0.00 | N | 0.0 | 27.0 | 0.0 |
| 12/31/1957 | 42 | 28 | 35.0 | 0.21 | T | 0.0 | 30.0 | 0.0 |
Cooling Degree Days is an index used by the power industry to
reflect the need for
power for cooling or air conditioning. CDD are determined by the equations and logic as follows:
Avg_Temp(F)
= (Max_Temp(F) + Min_Temp(F)) / 2.0
If Avg_Temp(F) is greater than 65F, Then
CDD = Avg_Temp(F) – 65
Else
CDD = 0
CDD positive example:
If on a given day a weather station records a minimum temperature
of
60F and a maximum of 90F, then:
75(F) = (90F + 60F) / 2.0
If 75F is greater than 65F then
CDD = 75 – 65 = 10
CDD zero example:
If
on a given day a weather station records a minimum temperature
of
50F and a maximum of 70F, then:
60(F) = (70(F) + 50(F)) / 2.0
If 60(F) is greater than 65F then
CDD = Avg_Temp(F) – 65
Else
CDD = 0
CDD are computed for each day
where maximum and
minimum temperatures are recorded.
CDD are often summed over a month or
season. For example if a weather station averages
10 CDD per day, it
is not uncommon to hear statement such as: “The weather
station in
New York City reported a total of 300 CDD for the month of
June”
GDD (Growing Degree Days)
Growing
Degree Days are calculated in a similar fashion to Cooling
Degree Days, except the threshold
is set to 50F as opposed to 65F in
the Cooling Degree Day calculation. The purpose of GDDs is to
estimate
how much energy crops have received. The maturity of many crops can be
estimated by the
number of GDD that accumulate from the point in time
that they where planted. For example many
varieties of corn generally
ready for harvest after a period of time in which 1100 to 1200 GDD have
occurred. The use of 50F as the threshold for Growing Degrees Days is
the most commonly used
threshold, however other thresholds are often
used for specific crops. For example a threshold of 41F
is often used
for Alpha crops. The GDD provide by Weather Source is based on a
threshold of 50.
HDD
(Heating Degree Days)
Heating
Degree Days is an index used by the power industry to reflect
the need for energy in producing
heat for buildings. HDD are
essentially the opposite of CDD and are determined by the equations and
logic as follows:
Avg_Temp(F)
= (Max_Temp(F) + Min_Temp(F)) / 2.0
If Avg_Temp(F) is less than 65F, Then
HDD = 65 - Avg_Temp(F)
Else
HDD = 0
HDD positive example:
If
on a given day a weather station records a minimum temperature
of
35F and a maximum of 55F, then:
45(F) = (55F + 35F) / 2.0
If 45F is less than 65F then
HDD = 65 – 45 = 20
HDD zero example:
If on a given day a weather
station records a minimum temperature
of
60F and a maximum of 80F, then:
70(F) = (80(F) + 60(F)) / 2.0
If 70(F) is less than 65F then
CDD = 65F - Avg_Temp(F)
Else
CDD = 0
HDD are computed for each day
where maximum and
minimum temperatures are recorded.
HDD are often summed over a month or
season. For example if a weather station averages
10 HDD per day, it
is not uncommon to hear statement such as: “The weather
station in
New York City reported a total of 300 HDD for the month of
March”
Max
‘Max’ is short for
‘Maximum’ and is most often used to describe the
highest value that a weather
parameter reaches during a 24 hour day.
Usage of ‘Max’ with other time periods is typically
preceded by a reference to the time period, for example Monthly Max
Temperature would mean
the highest temperature that occurred during a
month.
Mean
In most cases,
‘Mean’ refers to
the arithmetic mean of a weather parameter. Specifically the sum
of all
parameter members divided by the number of members. For example the
Daily Mean Wind
Speed is the sum of the 24 hourly wind speed
observations divided by 24. The exception to
this is often applied to
temperature where the Daily Mean Temperature has an established
convention of being the mean of the max and min temperature as opposed
to all available
temperature observations. The reason for this
is that in the US there are nearly 10,000
cooperative weather
stations
that only record the daily max and min temperature (and total
daily
precipitation and snowfall). In order for daily mean temperature to be
consistent
across all stations, all stations must produce the mean
using the same method. Thus even though
a station may record 24 hourly
temperatures throughout the day, the Daily Mean Temperature
is still
computed as the mean of the max and min temperatures so as to be
consistent with
stations that ONLY record max and min
temperatures.
Note that any ‘special’ observations
are not
typically used to produce the mean.
Min
‘Min’ is short for
‘Minimum’ and is most often used to describe the
lowest value that a weather
parameter reach during a 24 hour day. Usage
of ‘Min’ with other time periods is typically
preceded
by a reference to the time period, for example Monthly Min
Temperature would mean the
lowest temperature that occurred during a
month.
Precipitation
Precipitation is any water based
particle falling
from the sky that reaches the ground including
drizzle, freezing
drizzle, rain, freezing rain, snow, snow grains, snow pellets
(graupel),
sleet, hail, ice pellets and ice crystals. Weather Source provides
Precipitation as
“inches of liquid water”. For
non-frozen precipitation (rain and drizzle), this is simply the direct
measurement of the precipitation. For frozen precipitation the
precipitation is melted and the
depth is measured and recorded. For the
most part, with the exception of hail, one can safely
assume that
precipitation that occurs when the temperature (at 2 meters above the
ground)
is 34F or above will be rain. It is possible for snow to occur
and accumulate when the 2 meter
temperatures are slightly above
freezing (32F) when the air aloft is cold enough to support snow.
Also,
one can safely assume that precipitation that occurs when the 2 meter
temperature is below
30F will be of a frozen variety. For 2 meter
temperatures in between 30 and 34 degrees Fahrenheit,
one often has to
reference other weather information, to determine what type of
precipitation occurred.
Snowfall
Snowfall is the occurrence of
accumulating snow.
Weather Source provides observation of
Snowfall in units of inches.
Temperature
Unless otherwise noted, Weather Source
uses the
term ‘Temperature’ to refer to the temperature
at a
height of 2 meters above the ground. This is the standard height at
which temperature at
weather stations is observed. Weather Source
provides Temperature in units of degrees Fahrenheit.