| Monthly Cooling Degree Day Records | |||||||||||||
| The following table lists the monthly cooling degree Day's at Brookhaven National Laboratory since 1949. | |||||||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
| 1949 | 0.0 | 0.0 | 0.0 | 0.0 | 14.0 | 154.0 | 281.0 | 216.0 | 32.0 | 30.0 | 0.0 | 0.0 | 727.0 |
| 1950 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 72.0 | 165.0 | 103.0 | 39.0 | 1.0 | 1.0 | 0.0 | 381.0 |
| 1951 | 0.0 | 0.0 | 0.0 | 0.0 | 12.0 | 60.0 | 184.0 | 140.0 | 50.0 | 7.0 | 0.0 | 0.0 | 453.0 |
| 1952 | 0.0 | 0.0 | 0.0 | 4.0 | 2.0 | 112.0 | 293.0 | 183.0 | 54.0 | 2.0 | 0.0 | 0.0 | 650.0 |
| 1953 | 0.0 | 0.0 | 0.0 | 0.0 | 10.0 | 110.0 | 206.0 | 154.0 | 100.0 | 0.0 | 0.0 | 0.0 | 580.0 |
| 1954 | 0.0 | 0.0 | 0.0 | 0.0 | 2.0 | 92.0 | 158.0 | 91.0 | 31.0 | 57.0 | 0.0 | 0.0 | 431.0 |
| 1955 | 0.0 | 0.0 | 0.0 | 0.0 | 28.0 | 43.0 | 315.0 | 246.0 | 24.0 | 4.0 | 0.0 | 0.0 | 660.0 |
| 1956 | 0.0 | 0.0 | 0.0 | 0.0 | 14.0 | 94.0 | 136.0 | 160.0 | 51.0 | 0.0 | 0.0 | 0.0 | 455.0 |
| 1957 | 0.0 | 0.0 | 0.0 | 4.0 | 24.0 | 184.0 | 211.0 | 103.0 | 87.0 | 0.0 | 0.0 | 0.0 | 613.0 |
| 1958 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 36.0 | 232.0 | 130.0 | 37.0 | 0.0 | 0.0 | 0.0 | 435.0 |
| 1959 | 0.0 | 0.0 | 0.0 | 0.0 | 42.0 | 76.0 | 174.0 | 234.0 | 128.0 | 30.0 | 0.0 | 0.0 | 684.0 |
| 1960 | 0.0 | 0.0 | 0.0 | 0.0 | 9.0 | 84.0 | 120.0 | 144.0 | 30.0 | 3.0 | 0.0 | 0.0 | 390.0 |
| 1961 | 0.0 | 0.0 | 0.0 | 0.0 | 2.0 | 91.0 | 188.0 | 192.0 | 188.0 | 0.0 | 0.0 | 0.0 | 661.0 |
| 1962 | 0.0 | 0.0 | 0.0 | 0.0 | 28.0 | 72.0 | 100.0 | 106.0 | 26.0 | 3.0 | 0.0 | 0.0 | 335.0 |
| 1963 | 0.0 | 0.0 | 0.0 | 0.0 | 11.0 | 96.0 | 180.0 | 104.0 | 18.0 | 6.0 | 0.0 | 0.0 | 415.0 |
| 1964 | 0.0 | 0.0 | 0.0 | 0.0 | 41.0 | 70.0 | 204.0 | 101.0 | 55.0 | 0.0 | 0.0 | 0.0 | 471.0 |
| 1965 | 0.0 | 0.0 | 0.0 | 0.0 | 44.0 | 90.0 | 127.0 | 146.0 | 77.0 | 0.0 | 0.0 | 0.0 | 484.0 |
| 1966 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 94.0 | 236.0 | 162.0 | 26.0 | 0.0 | 0.0 | 0.0 | 518.0 |
| 1967 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 64.0 | 199.0 | 145.0 | 19.0 | 10.0 | 0.0 | 0.0 | 437.0 |
| 1968 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 55.0 | 212.0 | 176.0 | 52.0 | 8.0 | 0.0 | 0.0 | 503.0 |
| 1969 | 0.0 | 0.0 | 0.0 | 0.0 | 21.0 | 58.0 | 130.0 | 210.0 | 80.0 | 6.0 | 0.0 | 0.0 | 505.0 |
| 1970 | 0.0 | 0.0 | 0.0 | 0.0 | 18.0 | 89.0 | 226.0 | 202.0 | 104.0 | 9.0 | 0.0 | 0.0 | 648.0 |
| 1971 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 96.0 | 145.0 | 146.0 | 116.0 | 6.0 | 0.0 | 0.0 | 509.0 |
| 1972 | 0.0 | 0.0 | 0.0 | 0.0 | 7.0 | 53.0 | 254.0 | 156.0 | 80.0 | 0.0 | 0.0 | 0.0 | 550.0 |
| 1973 | 0.0 | 0.0 | 0.0 | 4.0 | 14.0 | 164.0 | 236.0 | 276.0 | 82.0 | 2.0 | 0.0 | 0.0 | 778.0 |
| 1974 | 0.0 | 0.0 | 0.0 | 4.0 | 14.0 | 70.0 | 230.0 | 213.0 | 60.0 | 0.0 | 0.0 | 0.0 | 591.0 |
| 1975 | 0.0 | 0.0 | 0.0 | 0.0 | 42.0 | 100.0 | 260.0 | 204.0 | 25.0 | 2.0 | 0.0 | 0.0 | 633.0 |
| 1976 | 0.0 | 0.0 | 0.0 | 12.0 | 10.0 | 164.0 | 157.0 | 176.0 | 42.0 | 1.0 | 0.0 | 0.0 | 562.0 |
| 1977 | 0.0 | 0.0 | 0.0 | 0.0 | 38.0 | 72.0 | 237.0 | 232.0 | 98.0 | 0.0 | 1.0 | 0.0 | 678.0 |
| 1978 | 0.0 | 0.0 | 0.0 | 0.0 | 34.0 | 60.0 | 128.0 | 198.0 | 12.0 | 0.0 | 0.0 | 0.0 | 432.0 |
| 1979 | 0.0 | 0.0 | 0.0 | 0.0 | 12.0 | 41.0 | 257.0 | 216.0 | 64.0 | 10.0 | 0.0 | 0.0 | 600.0 |
| 1980 | 0.0 | 0.0 | 0.0 | 0.0 | 18.0 | 80.0 | 252.0 | 276.0 | 107.0 | 3.0 | 0.0 | 0.0 | 736.0 |
| 1981 | 0.0 | 0.0 | 0.0 | 0.0 | 24.0 | 120.0 | 293.0 | 187.0 | 39.0 | 0.0 | 0.0 | 0.0 | 663.0 |
| 1982 | 0.0 | 0.0 | 0.0 | 0.0 | 10.0 | 38.0 | 231.0 | 126.0 | 47.0 | 8.0 | 3.0 | 0.0 | 463.0 |
| 1983 | 0.0 | 0.0 | 0.0 | 3.0 | 4.0 | 101.0 | 261.0 | 217.0 | 141.0 | 19.0 | 0.0 | 0.0 | 746.0 |
| 1984 | 0.0 | 0.0 | 0.0 | 7.0 | 2.0 | 144.0 | 176.0 | 213.0 | 39.0 | 4.0 | 0.0 | 0.0 | 585.0 |
| 1985 | 0.0 | 0.0 | 0.0 | 0.0 | 25.0 | 36.0 | 204.0 | 147.0 | 98.0 | 4.0 | 0.0 | 0.0 | 514.0 |
| 1986 | 0.0 | 0.0 | 0.0 | 0.0 | 49.0 | 78.0 | 211.0 | 134.0 | 34.0 | 17.0 | 0.0 | 0.0 | 523.0 |
| 1987 | 0.0 | 0.0 | 0.0 | 0.0 | 49.0 | 135.0 | 259.0 | 133.0 | 39.0 | 0.0 | 0.0 | 0.0 | 615.0 |
| 1988 | 0.0 | 0.0 | 0.0 | 0.0 | 24.0 | 117.0 | 285.0 | 282.0 | 21.0 | 2.0 | 0.0 | 0.0 | 731.0 |
| 1989 | 0.0 | 0.0 | 0.0 | 0.0 | 11.0 | 125.0 | 199.0 | 214.0 | 90.0 | 0.0 | 0.0 | 0.0 | 639.0 |
| 1990 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 98.0 | 240.0 | 224.0 | 62.0 | 45.0 | 0.0 | 0.0 | 669.0 |
| 1991 | 0.0 | 0.0 | 0.0 | 8.0 | 86.0 | 135.0 | 248.0 | 247.0 | 68.0 | 10.0 | 0.0 | 0.0 | 802.0 |
| 1992 | 0.0 | 0.0 | 0.0 | 0.0 | 7.0 | 46.0 | 144.6 | 116.7 | 68.7 | 0.0 | 0.0 | 0.0 | 383.0 |
| 1993 | 0.0 | 0.0 | 0.0 | 0.0 | 19.0 | 134.0 | 279.0 | 208.0 | 94.0 | 0.0 | 1.0 | 0.0 | 735.0 |
| 1994 | 0.0 | 0.0 | 0.0 | 0.0 | 7.0 | 183.0 | 368.0 | 152.0 | 33.0 | 0.0 | 0.0 | 0.0 | 743.0 |
| 1995 | 0.0 | 0.0 | 0.0 | 0.0 | 7.0 | 96.5 | 290.9 | 222.4 | 52.9 | 9.7 | 0.0 | 0.0 | 679.4 |
| 1996 | 0.0 | 0.0 | 0.0 | 16.0 | 39.0 | 95.5 | 154.2 | 172.4 | 85.7 | 0.0 | 0.0 | 0.0 | 562.8 |
| 1997 | 0.0 | 0.0 | 0.0 | 0.0 | 1.5 | 116.9 | 225.1 | 168.8 | 41.9 | 10.4 | 0.0 | 0.0 | 564.6 |
| 1998 | 0.0 | 0.0 | 0.0 | 0.0 | 22.0 | 101.1 | 228.7 | 230.0 | 87.2 | 0.0 | 0.0 | 0.0 | 669.0 |
| 1999 | 0.0 | 0.0 | 0.0 | 0.0 | 10.5 | 160.0 | 351.0 | 211.8 | 79.0 | 0.0 | 0.0 | 0.0 | 812.3 |
| 2000 | 0.0 | 0.0 | 0.0 | 0.0 | 41.0 | 123.5 | 128.6 | 182.0 | 83.0 | 0.0 | 0.0 | 0.0 | 558.1 |
| 2001 | 0.0 | 0.0 | 0.0 | 0.0 | 36.8 | 174.3 | 144.5 | 290.3 | 60.0 | 10.3 | 0.0 | 0.0 | 716.2 |
| 2001 | 0.0 | 0.0 | 0.0 | 0.0 | 36.8 | 174.3 | 144.5 | 290.3 | 60.0 | 10.3 | 0.0 | 0.0 | 716.2 |
| 2003 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 104.0 | 244.0 | 298.0 | 63.0 | 1.0 | 2.0 | 0.0 | 713.0 |
| 2004 | 0.0 | 0.0 | 0.0 | 0.0 | 32.8 | 100.5 | 210.0 | 195.0 | 79.0 | 0.0 | 0.0 | 0.0 | 617.3 |
| 2005 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 165.0 | 278.0 | 348.0 | 144.0 | 21.0 | 0.0 | 0.0 | 957.0 |
| 2006 | 0.0 | 0.0 | 0.0 | 0.0 | 21.0 | 135.0 | 308.0 | 228.0 | 42.0 | 2.0 | 0.0 | 0.0 | 736.0 |
| 2007 | 0.0 | 0.0 | 0.0 | 0.0 | 44.0 | 110.0 | 232.0 | 227.0 | 87.0 | 66.0 | 0.0 | 0.0 | 766.0 |
| 2008 | 0.0 | 0.0 | 0.0 | 0.8 | 2.0 | 180.5 | 288.4 | nan | 52.9 | 0.3 | 0.0 | 0.0 | 524.9 |
| 2009 | 0.0 | 0.0 | 0.0 | 14.9 | 4.9 | 67.5 | 166.8 | 266.7 | 29.0 | 2.3 | 0.0 | 0.0 | 552.1 |
| 2010 | 0.0 | 0.0 | 0.0 | 2.9 | 36.9 | 188.8 | 362.3 | 237.2 | 112.5 | 2.0 | 0.0 | 0.0 | 942.6 |
| 2011 | 0.0 | 0.0 | 0.0 | 0.0 | 51.6 | 130.2 | 312.1 | 225.5 | 131.3 | 3.8 | 0.0 | 0.0 | 854.5 |
| 2012 | 0.0 | 0.0 | 0.0 | 2.8 | 47.0 | 109.7 | 292.7 | 244.7 | 76.7 | 12.7 | 0.0 | 0.0 | 786.3 |
| 2013 | 0.0 | 0.0 | 0.0 | 0.0 | 30.9 | 129.5 | 353.9 | 161.3 | 70.7 | 17.2 | 0.0 | 0.0 | 763.5 |
| 2014 | 0.0 | 0.0 | 0.0 | 0.0 | 13.0 | 77.3 | 215.9 | 123.8 | 71.6 | 12.0 | 0.0 | 0.0 | 513.6 |
| 2015 | 0.0 | 0.0 | 0.0 | 0.0 | 35.6 | 106.5 | 266.3 | 258.6 | 140.7 | 0.0 | 0.0 | 0.0 | 807.7 |
| 2016 | 0.0 | 0.0 | 0.0 | 0.0 | 34.9 | 78.3 | 288.8 | 297.7 | 106.4 | 11.1 | 0.0 | 0.0 | 817.2 |
| 2017 | 0.0 | 0.0 | 0.0 | 9.6 | 25.2 | 110.1 | 219.2 | 147.9 | 96.2 | 35.0 | 0.2 | 0.0 | 643.4 |
| 2018 | 0.0 | 0.0 | 0.0 | 0.0 | 33.2 | 82.6 | 257.1 | 296.8 | 124.3 | 26.8 | 0.0 | 0.0 | 820.8 |
| 2019 | 0.0 | 0.0 | 0.0 | 0.0 | 14.6 | 94.9 | 312.9 | 202.3 | 45.8 | 17.3 | 0.0 | 0.0 | 687.8 |
| 2020 | 0.0 | 0.0 | 0.0 | 0.0 | 13.8 | 142.4 | 329.8 | 253.7 | 69.1 | 1.5 | 0.0 | 0.0 | 810.3 |
| 2021 | 0.0 | 0.0 | 0.0 | 0.0 | 22.6 | 150.2 | 256.6 | 284.5 | 109.8 | 5.3 | 0.0 | 0.0 | 829.0 |
| 2022 | 0.0 | 0.0 | 0.0 | 0.0 | 46.1 | 83.5 | 305.4 | 325.7 | 83.3 | 5.2 | 5.8 | 0.0 | 855.0 |
| 2023 | 0.0 | 0.0 | 0.0 | 8.6 | 5.6 | 75.3 | 307.4 | 175.3 | 128.3 | 10.6 | 0.0 | 0.0 | 711.1 |
| 2024 | 0.0 | 0.0 | 0.0 | 2.1 | 21.9 | 156.0 | 304.8 | 210.9 | 39.7 | 2.9 | 4.0 | 0.0 | 742.3 |
| 2025 | 0.0 | 0.0 | 0.0 | 0.0 | |||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
| Average | 0.0 | 0.0 | 0.0 | 1.4 | 20.5 | 103.3 | 230.8 | 198.7 | 70.4 | 8.0 | 0.2 | 0.0 | 630.7 |
| Maximum | 0.0 | 0.0 | 0.0 | 16.0 | 86.0 | 188.8 | 368.0 | 348.0 | 188.0 | 66.0 | 5.8 | 0.0 | 957.0 |
| Minimum | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 36.0 | 100.0 | 91.0 | 12.0 | 0.0 | 0.0 | 0.0 | 335.0 |
| nan = incomplete data to calculate value, missing data. | |||||||||||||