BOULDER, COLORADO

Monthly Total Cooling Degree Days

(050848)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
Months with 5 missing days or less use mean for missing day(s)
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.
YEAR(S JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
1893 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2.50 0.00 0.00 a 2.50
1894 0.00 l 0.00 j 0.00 0.00 a 0.00 z 0.00 z 133.96 c 96.50 0.00 z 0.00 z 0.00 z 0.00 230.46
1895 0.00 d 0.00 b 0.00 b 0.00 6.41 b 14.00 15.00 u 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 20.41
1896 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1897 0.00 z 0.00 z 0.00 z 0.00 z 9.00 78.50 200.50 135.50 106.00 5.50 0.00 0.00 535.00
1898 0.00 0.00 0.00 0.00 4.00 129.00 234.50 251.00 69.00 0.00 0.00 0.00 687.50
1899 0.00 0.00 0.00 0.00 5.00 102.00 142.00 170.50 99.00 9.00 0.00 0.00 527.50
1900 0.00 0.00 0.00 0.00 23.50 156.50 191.50 227.50 61.50 4.00 0.00 0.00 664.50
1901 0.00 0.00 0.00 3.10 a 4.00 108.50 318.00 196.00 30.00 1.50 0.00 a 0.00 661.10
1902 0.00 0.00 0.00 2.50 7.50 109.50 174.63 a 219.00 48.50 6.72 a 0.00 a 0.00 568.35
1903 0.00 d 0.00 0.00 b 0.00 a 0.00 a 45.54 b 210.50 175.50 62.50 4.50 0.00 0.00 498.54
1904 0.00 a 0.00 a 0.00 0.00 5.50 16.00 118.50 172.00 72.50 5.00 0.00 0.00 389.50
1905 0.00 c 0.00 0.00 0.00 1.50 63.00 110.00 230.00 85.50 10.50 0.00 a 0.00 d 500.50
1906 0.00 0.00 0.00 2.00 5.00 41.00 102.50 137.95 a 56.50 15.50 0.00 0.00 360.45
1907 0.00 0.00 3.50 1.50 7.00 45.00 168.50 182.00 76.00 3.50 0.00 c 0.00 g 487.00
1908 0.00 0.00 0.00 5.00 12.00 52.50 168.50 114.50 123.50 3.50 0.00 0.00 479.50
1909 0.00 0.00 0.00 0.00 4.50 76.50 193.50 228.00 28.00 3.50 0.00 0.00 534.00
1910 0.00 0.00 11.50 19.00 20.00 97.50 0.00 z 0.00 z 40.86 a 6.50 0.00 0.00 a 195.36
1911 0.00 0.00 0.00 0.00 20.50 133.00 134.00 150.50 66.00 0.00 0.00 0.00 z 504.00
1912 0.00 z 0.00 z 0.00 h 0.00 3.58 e 41.11 c 118.50 146.00 24.00 0.00 0.00 a 0.00 333.19
1913 0.00 0.00 0.00 0.00 18.00 74.00 166.50 207.18 a 40.50 0.00 0.00 0.00 506.18
1914 0.00 a 0.00 a 0.00 f 0.00 a 9.00 133.00 190.00 167.92 a 70.00 0.50 0.00 0.00 570.42
1915 0.00 0.00 0.00 0.00 15.00 36.50 128.50 51.00 23.79 a 0.50 0.00 0.00 b 255.29
1916 0.00 0.00 0.00 1.00 62.00 a 140.00 357.00 145.50 61.00 0.50 0.00 d 0.00 767.00
1917 0.00 0.00 0.00 a 0.00 6.00 179.50 365.00 196.50 44.50 10.00 0.00 0.00 801.50
1918 0.00 0.00 0.00 0.00 22.50 201.50 300.00 324.00 24.00 7.23 a 0.00 0.00 879.23
1919 0.00 0.00 c 0.00 2.00 7.50 177.50 369.00 354.00 140.50 3.00 i 0.00 j 0.00 l 1050.50
1920 0.00 0.00 0.00 0.00 5.00 51.67 c 176.50 121.42 a 48.33 c 1.60 b 0.00 a 0.00 b 404.52
1921 0.00 0.00 0.00 0.00 a 1.07 b 89.00 207.00 169.50 40.86 a 9.00 0.00 a 0.00 516.43
1922 0.00 0.00 c 0.00 0.00 4.00 200.00 222.50 237.15 a 89.44 c 7.00 0.00 0.00 760.09
1923 0.00 0.00 a 0.00 0.00 2.00 43.50 166.50 74.92 a 24.00 0.00 0.00 0.00 310.92
1924 0.00 0.00 0.00 0.00 5.00 141.00 223.50 280.50 23.00 0.00 0.00 0.00 673.00
1925 0.00 0.00 0.00 0.00 32.50 90.00 268.67 a 119.00 58.00 1.00 0.00 0.00 569.17
1926 0.00 0.00 0.00 0.00 7.50 75.50 169.00 190.50 41.00 0.00 0.00 0.00 483.50
1927 0.00 0.00 0.00 1.50 14.50 82.00 142.50 38.50 48.50 0.50 0.00 a 0.00 a 328.00
1928 0.00 0.00 0.00 0.00 16.00 26.50 139.00 145.00 42.50 6.00 0.00 0.00 375.00
1929 0.00 0.00 0.00 0.00 6.50 110.00 271.50 226.00 32.00 5.50 0.00 0.00 651.50
1930 0.00 0.00 0.00 4.00 11.50 151.50 260.50 147.00 20.00 0.00 0.00 0.00 594.50
1931 0.00 0.00 0.00 0.00 23.00 175.00 301.73 a 207.00 115.00 0.00 0.00 0.00 821.73
1932 0.00 0.00 0.00 a 0.00 11.50 57.50 243.50 207.00 52.50 2.00 0.00 a 0.00 574.00
1933 0.00 0.00 0.00 0.00 10.00 208.50 324.39 c 156.00 106.00 1.55 a 0.00 0.00 806.44
1934 0.00 0.00 0.00 0.00 83.50 173.00 356.00 244.00 38.50 3.50 0.00 0.00 898.50
1935 0.00 0.00 0.00 0.00 0.00 14.00 s 256.00 200.50 74.50 0.00 0.00 0.00 531.00
1936 0.00 0.00 0.00 0.00 15.50 183.50 316.00 228.50 75.50 0.50 0.00 z 0.00 819.50
1937 0.00 0.00 0.00 0.00 9.00 96.50 229.00 279.00 70.00 0.00 0.00 0.00 683.50
1938 0.00 0.00 0.00 0.00 6.50 70.50 199.00 237.50 52.50 2.00 0.00 0.00 568.00
1939 0.00 0.00 0.00 2.00 15.00 84.00 263.50 159.00 62.50 0.00 0.00 0.00 586.00
1940 0.00 0.00 0.00 0.00 21.50 153.00 217.00 118.00 36.00 0.00 0.00 0.00 545.50
1941 0.00 0.00 a 0.00 a 0.00 21.00 53.50 147.50 102.82 a 17.50 0.00 0.00 0.00 342.32
1942 0.00 0.00 0.00 0.00 14.00 45.52 a 227.50 153.50 29.50 2.50 0.00 0.00 472.52
1943 0.00 0.00 0.00 0.00 8.50 103.50 267.50 246.00 24.00 0.00 0.00 0.00 649.50
1944 0.00 0.00 0.00 0.00 14.50 64.50 132.50 192.00 22.50 0.00 0.00 0.00 426.00
1945 0.00 0.00 0.00 0.00 1.00 33.50 190.50 180.00 65.00 0.00 0.50 0.00 470.50
1946 0.00 0.00 0.00 0.00 0.00 150.00 204.50 176.24 d 52.00 1.50 0.00 0.00 584.24
1947 0.00 b 0.00 0.00 0.00 21.50 47.00 278.50 g 341.50 176.50 31.00 0.00 0.00 617.50
1948 0.00 0.00 0.00 3.50 37.00 130.00 318.27 a 314.50 0.00 z 0.00 z 0.00 z 0.00 v 803.27
1949 0.00 0.00 0.00 8.50 21.70 a 141.00 308.50 269.50 88.00 0.00 0.00 0.00 837.20
1950 0.00 0.00 0.00 4.00 18.50 168.00 198.00 216.50 59.50 45.00 0.00 0.00 709.50
1951 0.00 0.00 0.00 0.00 28.50 56.00 325.00 227.50 69.50 5.50 0.00 0.00 712.00
1952 0.00 0.00 0.00 1.50 16.00 289.50 353.00 231.47 a 143.50 6.00 0.00 0.00 1040.97
1953 0.00 0.00 0.00 5.50 9.00 226.50 334.00 266.50 166.00 27.00 0.00 0.00 1034.50
1954 0.00 0.00 0.00 2.00 32.00 227.50 412.00 309.00 138.00 15.50 c 0.00 0.00 1136.00
1955 0.00 0.00 0.00 2.50 29.45 a 98.00 359.00 308.00 153.50 9.00 0.00 1.00 960.45
1956 0.00 0.00 0.00 0.00 37.00 298.50 285.50 232.50 165.50 23.50 0.00 0.00 1042.50
1957 0.00 0.00 0.00 0.00 2.50 138.50 334.50 266.50 73.50 4.50 0.00 0.00 820.00
1958 0.00 0.00 0.00 1.50 73.50 177.50 212.00 308.00 115.00 27.50 0.00 0.00 915.00
1959 0.00 0.00 0.00 3.00 4.00 184.50 211.50 248.00 65.00 0.00 0.00 0.00 716.00
1960 0.00 0.00 0.00 4.00 27.00 193.50 299.00 284.00 109.00 8.50 0.00 0.00 925.00
1961 0.00 0.00 0.00 1.00 32.00 139.00 250.00 234.00 31.50 2.50 0.00 0.00 690.00
1962 0.00 0.00 0.00 9.50 42.00 106.50 218.00 261.50 53.50 10.50 0.00 0.00 701.50
1963 0.00 0.00 0.00 0.00 28.50 182.00 371.48 a 187.00 113.50 43.50 0.00 0.00 925.98
1964 0.00 0.00 0.00 0.00 81.00 102.50 371.50 210.00 78.50 8.00 0.00 0.00 851.50
1965 0.00 0.00 0.00 6.00 21.50 83.00 251.00 188.00 19.00 18.50 0.00 0.00 587.00
1966 0.00 0.00 1.50 2.50 79.50 132.50 391.00 209.50 58.50 1.50 0.00 0.00 876.50
1967 0.00 0.00 1.50 0.00 35.50 30.00 247.00 190.00 53.50 18.00 0.00 0.00 575.50
1968 0.00 0.00 0.00 0.00 9.50 165.00 244.50 166.50 53.50 7.00 0.00 0.00 646.00
1969 0.00 0.00 0.00 0.00 48.00 67.00 320.00 289.00 70.50 0.00 0.00 0.00 794.50
1970 0.00 0.00 0.00 0.00 29.50 104.50 258.00 262.50 60.00 0.50 0.00 0.00 715.00
1971 0.00 0.00 0.00 0.00 0.00 151.50 210.50 221.50 65.50 0.00 0.00 0.00 649.00
1972 0.00 0.00 0.00 0.00 2.50 99.50 184.50 152.00 31.00 1.50 0.00 0.00 471.00
1973 0.00 0.00 0.00 0.00 12.00 134.00 183.00 239.00 11.50 0.00 0.00 0.00 579.50
1974 0.00 0.00 0.00 1.50 28.00 157.50 256.00 128.00 42.00 2.50 0.00 0.00 615.50
1975 0.00 0.00 0.00 3.50 4.50 70.50 221.50 200.00 46.50 4.00 0.00 0.00 550.50
1976 0.00 0.00 0.00 0.00 7.50 81.00 253.00 148.50 46.00 2.00 0.00 0.00 538.00
1977 0.00 0.00 0.00 0.00 4.50 186.00 268.00 126.50 65.50 0.00 0.00 0.00 650.50
1978 0.00 0.00 0.00 0.00 20.15 a 129.50 269.00 144.00 87.50 0.50 0.00 0.00 z 650.65
1979 0.00 0.00 c 0.00 0.00 0.00 z 0.00 z 252.00 137.95 a 0.00 z 11.37 a 0.00 0.00 401.32
1980 0.00 0.00 0.00 1.00 1.00 210.00 0.00 z 216.00 84.50 3.00 1.00 0.50 517.00
1981 0.00 0.00 0.00 9.00 7.00 150.50 209.50 130.50 24.00 0.00 0.00 a 0.00 530.50
1982 0.00 0.00 0.00 0.00 2.50 29.00 213.00 237.00 44.50 0.00 0.00 z 0.00 526.00
1983 0.00 z 0.00 k 0.00 0.00 16.00 50.50 234.00 301.00 96.00 0.00 a 0.00 0.00 697.50
1984 0.00 0.00 0.00 0.00 30.00 78.00 263.50 201.50 54.50 0.00 a 0.00 0.00 627.50
1985 0.00 0.00 0.00 0.50 18.50 148.50 222.00 223.72 a 43.39 b 0.00 a 0.00 0.00 656.61
1986 0.00 b 0.00 0.00 0.00 3.00 145.00 206.00 176.00 9.00 0.00 0.00 0.00 539.00
1987 0.00 0.00 0.00 5.00 10.00 119.00 248.00 157.00 27.00 1.00 0.00 0.00 567.00
1988 0.00 0.00 0.00 0.00 29.50 192.50 241.50 216.00 46.50 0.00 0.00 0.00 726.00
1989 0.00 0.00 0.00 19.50 32.00 71.50 255.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 378.50
1990 0.00 z 0.00 z 0.00 z 0.00 1.50 171.50 147.00 131.50 74.50 2.00 0.00 0.00 528.00
1991 0.00 0.00 0.00 1.00 7.50 94.00 187.00 136.50 25.50 17.50 0.00 0.00 469.00
1992 0.00 0.00 0.00 6.00 13.50 32.00 124.00 98.50 56.00 5.00 0.00 0.00 335.00
1993 0.00 0.00 0.00 0.00 3.50 79.00 143.50 0.00 z 21.00 4.50 0.00 0.00 251.50
1994 0.00 0.00 0.00 1.00 20.00 154.50 190.00 182.00 66.50 0.00 a 0.00 0.00 614.00
1995 0.00 0.00 0.00 0.00 0.00 43.50 188.00 279.00 66.50 2.50 0.00 0.00 579.50
1996 0.00 0.00 0.00 3.50 35.50 89.00 200.00 143.00 45.00 8.50 0.00 0.00 524.50
1997 0.00 0.00 0.00 0.00 6.50 89.50 202.50 134.50 68.00 10.00 0.00 z 0.00 z 511.00
1998 0.00 0.00 0.00 0.00 11.50 73.00 242.50 0.00 z 107.50 0.00 0.00 z 0.00 z 434.50
1999 0.00 z 0.00 z 0.00 z 0.00 z 0.00 68.00 258.50 140.00 14.50 1.03 a 0.00 a 0.00 482.03
2000 0.00 0.00 0.00 0.00 b 61.50 135.52 a 290.00 251.00 90.00 4.50 0.00 0.00 832.52
2001 0.00 0.00 0.00 0.00 21.50 152.00 310.00 213.50 70.00 6.50 0.00 0.00 773.50
2002 0.00 0.00 0.00 4.50 17.50 186.50 366.00 201.00 75.00 0.00 0.00 0.00 850.50
2003 0.00 0.00 0.00 0.50 26.00 25.50 335.50 252.50 18.50 13.00 0.00 0.00 671.50
2004 0.00 0.00 0.00 0.00 25.50 41.00 148.50 81.50 52.50 0.00 0.00 0.00 349.00
2005 0.00 0.00 0.00 0.00 30.50 89.00 317.00 155.50 99.00 12.50 0.00 0.00 703.50
2006 0.00 0.00 0.00 1.00 59.50 205.50 296.00 215.00 11.50 8.50 3.50 0.00 800.50
2007 0.00 0.00 0.00 1.00 2.00 127.50 302.50 265.50 72.50 6.00 1.00 0.00 778.00
2008 0.00 0.00 0.00 0.00 8.50 78.00 310.50 175.00 11.50 0.00 0.00 0.00 583.50
2009 0.00 0.00 0.00 0.00 0.00 z 37.50 164.00 150.00 52.00 0.00 0.00 0.00 403.50
2010 0.00 0.00 0.00 0.00 18.00 103.50 238.50 230.00 79.50 0.00 0.00 0.00 669.50
2011 0.00 0.00 0.00 0.00 a 8.00 105.50 263.50 314.00 48.50 3.50 0.00 0.00 743.00
2012 0.00 0.00 0.00 7.50 25.50 277.50 303.50 254.50 92.00 4.00 0.00 a 0.00 964.50
2013 0.00 0.00 a 0.00 a 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
Period of Record Statistics
MEAN 0.00 0.00 0.16 1.42 17.70 114.04 239.57 199.09 62.58 5.20 0.05 0.01 648.72
S.D. 0.00 0.00 1.14 3.14 17.69 60.91 71.81 63.40 35.65 8.13 0.36 0.11 183.93
SKEW 0.00 0.00 9.07 3.69 1.84 0.61 0.22 0.07 1.02 2.77 8.39 8.27 0.27
MAX 0.00 0.00 11.50 19.50 83.50 298.50 412.00 354.00 176.50 45.00 3.50 1.00 1136.00
MIN 0.00 0.00 0.00 0.00 0.00 14.00 102.50 38.50 9.00 0.00 0.00 0.00 255.29
NO YRS 113 113 114 116 115 115 114 113 113 114 110 110 93