BOULDER, COLORADO

Monthly Total Heating Degree Days

(050848)

Base Temperature = 65 F

File last updated on Jul 24, 2006
*** Note *** Provisional Data *** After Year/Month 200603
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
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 3.00 32.00 319.00 755.50 983.50 2093.00
1949 1336.50 866.50 709.50 360.00 163.27 a 61.00 0.00 0.00 44.50 425.00 358.00 868.00 5192.27
1950 994.00 640.00 738.00 460.00 314.00 41.00 0.00 2.00 151.00 140.00 675.50 769.00 4924.50
1951 1038.50 758.50 855.00 550.00 204.00 135.50 17.50 11.50 115.50 421.00 731.50 1031.00 5869.50
1952 901.50 780.50 891.50 423.50 212.50 0.50 16.00 0.52 a 37.00 246.50 835.00 886.50 5231.52
1953 667.50 790.00 585.00 599.50 310.50 22.00 1.00 0.00 23.50 257.50 566.50 915.50 4738.50
1954 782.50 487.50 862.50 277.00 241.00 32.00 0.00 0.00 48.50 366.46 c 524.50 784.50 4406.46
1955 1054.50 984.00 826.00 369.50 160.68 a 96.00 0.00 0.00 106.50 258.50 783.50 871.50 5510.68
1956 858.00 990.50 690.50 474.50 129.50 0.00 1.50 15.50 36.00 227.50 711.50 782.00 4917.00
1957 1159.50 641.50 754.00 641.00 312.00 52.50 0.00 0.00 122.50 360.00 743.00 648.00 5434.00
1958 868.50 709.00 978.00 561.00 95.00 21.00 6.00 4.50 91.00 300.00 674.00 858.50 5166.50
1959 1006.00 935.00 761.50 545.50 251.50 16.00 0.00 0.00 203.50 477.00 733.00 805.50 5734.50
1960 1045.00 1062.00 767.00 386.50 196.50 13.00 3.00 9.50 69.00 334.00 635.50 916.00 5437.00
1961 871.50 702.50 775.50 506.00 223.00 59.00 5.00 0.00 258.50 381.00 812.50 1076.50 5671.00
1962 1232.00 848.50 865.50 377.00 150.50 62.00 0.00 12.00 97.50 242.50 575.50 842.00 5305.00
1963 1289.00 676.00 740.00 395.50 108.00 35.00 0.00 a 2.50 14.50 196.00 627.50 983.50 5067.50
1964 917.00 957.50 892.50 488.50 204.00 60.00 0.00 10.50 97.50 294.50 695.50 889.00 5506.50
1965 826.00 904.50 1060.50 396.00 223.50 39.50 3.50 10.50 292.50 240.00 578.50 821.50 5396.50
1966 1041.50 944.50 582.50 497.50 128.00 58.00 0.00 7.00 75.00 356.50 656.50 958.00 5305.00
1967 881.50 759.00 578.50 422.50 332.50 114.00 0.00 17.00 89.00 311.50 706.50 1142.00 5354.00
1968 972.00 824.50 634.50 577.50 301.00 26.00 10.00 12.00 106.50 311.00 796.50 1002.50 5574.00
1969 891.50 794.50 939.50 333.00 163.00 150.50 1.00 0.00 35.50 720.00 697.50 888.50 5614.50
1970 965.00 675.00 876.00 597.50 158.00 76.00 0.00 0.00 184.50 540.00 703.50 910.50 5686.00
1971 937.00 900.50 768.50 513.50 326.00 30.00 9.00 0.00 248.00 443.00 715.00 997.50 5888.00
1972 1004.00 720.00 543.00 463.00 255.00 7.50 33.50 28.00 121.00 419.00 932.50 1150.50 5677.00
1973 1111.00 846.00 810.00 657.00 296.00 49.00 30.00 0.50 181.50 314.50 764.00 923.50 5983.00
1974 1128.00 775.00 653.50 523.00 145.00 67.50 0.00 15.00 186.50 337.00 754.50 1001.50 5586.50
1975 992.00 901.50 799.00 615.00 321.00 93.50 0.50 8.50 174.50 312.50 772.50 836.00 5826.50
1976 1008.50 685.00 823.50 474.00 274.50 44.00 0.00 2.50 173.50 485.50 770.00 880.50 5621.50
1977 1143.50 729.50 791.50 465.50 173.50 0.50 0.00 14.50 49.50 347.50 703.50 836.00 5255.00
1978 1173.00 987.00 673.50 474.00 291.92 a 93.50 0.00 5.50 89.00 340.50 744.50 0.00 z 4872.42
1979 1314.00 815.92 c 696.00 449.50 0.00 z 0.00 z 0.00 45.98 a 0.00 z 286.75 a 898.00 808.50 5314.65
1980 1102.00 827.00 810.00 521.00 293.50 9.00 0.00 z 1.50 64.00 389.50 637.00 649.50 5304.00
1981 808.50 720.50 708.00 259.00 314.50 29.00 4.00 15.00 39.50 444.50 571.03 a 872.50 4786.03
1982 970.00 827.50 655.50 447.00 285.00 111.50 3.00 0.00 152.00 452.00 0.00 z 916.50 4820.00
1983 0.00 z 400.50 k 817.00 647.00 385.00 124.00 3.50 0.00 84.50 352.88 a 734.00 1374.50 4522.38
1984 1091.50 847.50 772.00 637.50 174.00 62.50 0.00 1.00 176.50 597.27 a 725.50 964.00 6049.27
1985 1186.50 994.00 726.50 393.00 182.00 41.00 0.00 0.00 a 243.21 b 410.23 a 1017.00 1029.50 6222.95
1986 716.74 b 769.00 504.50 430.50 254.50 18.50 1.50 0.00 180.50 457.50 731.00 976.50 5040.74
1987 953.50 785.00 782.00 380.00 197.00 11.50 8.00 34.50 127.00 380.00 720.50 1060.00 5439.00
1988 1118.50 848.50 748.50 403.50 208.00 15.00 1.00 4.00 128.50 318.00 702.50 1000.00 5496.00
1989 885.00 1146.50 623.50 432.50 212.00 94.00 1.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 3394.50
1990 0.00 z 0.00 z 0.00 z 510.50 328.00 23.00 34.50 14.50 83.50 352.50 595.50 1165.00 3107.00
1991 1088.00 676.00 689.50 518.50 217.50 47.00 17.50 7.50 126.00 418.50 847.00 919.50 5572.50
1992 902.00 708.00 672.50 329.00 197.50 95.00 21.50 58.50 73.50 345.50 927.00 1110.50 5440.50
1993 1136.50 963.50 702.50 523.00 236.50 94.00 5.00 0.00 z 209.50 512.00 881.50 918.00 6182.00
1994 914.00 926.50 656.50 522.50 150.00 11.00 5.00 0.50 81.50 443.82 a 849.00 896.50 5456.82
1995 957.00 745.00 709.50 596.50 438.50 123.50 18.00 1.00 205.00 421.00 603.00 891.50 5709.50
1996 1094.00 792.50 838.00 441.00 226.50 31.00 0.00 4.00 172.00 380.00 732.50 884.50 5596.00
1997 1046.50 904.50 604.00 665.50 241.00 46.00 4.00 20.00 97.50 392.50 0.00 z 0.00 z 4021.50
1998 883.50 801.00 817.00 555.00 205.00 142.50 2.00 0.00 z 46.50 455.00 0.00 z 0.00 z 3907.50
1999 0.00 z 0.00 z 0.00 z 0.00 z 292.00 74.50 0.00 6.50 210.00 422.63 a 513.62 a 870.50 2389.75
2000 889.50 694.00 686.50 418.39 b 177.50 66.21 a 0.00 2.00 144.50 488.50 1010.50 1047.00 5624.60
2001 994.00 915.00 751.50 429.50 226.00 46.50 0.00 1.00 70.00 352.50 634.50 930.50 5351.00
2002 988.50 812.50 851.50 368.50 291.50 21.00 0.00 5.50 103.00 591.50 742.00 881.00 5656.50
2003 768.50 935.50 661.50 432.50 263.00 90.50 0.00 8.50 153.50 249.00 782.50 888.00 5233.00
2004 917.50 909.50 522.50 474.50 181.50 110.00 19.50 38.00 117.00 407.50 760.00 885.00 5342.50
2005 916.50 759.50 714.00 498.00 259.00 76.50 5.50 9.50 63.50 381.50 602.00 980.50 5266.00
2006 754.50 877.00 794.00 334.50 166.88 a 9.44 c 5.50 k 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2936.33
Period of Record Statistics
MEAN 990.78 823.23 745.37 474.42 232.78 55.78 5.21 8.57 119.77 375.92 721.31 929.23 5438.32
S.D. 146.48 120.94 112.10 96.50 71.05 39.92 8.74 12.15 66.61 103.55 121.48 124.16 351.42
SKEW 0.23 0.07 0.16 0.08 0.40 0.58 2.02 2.26 0.54 0.61 -0.01 0.75 -0.49
MAX 1336.50 1146.50 1060.50 665.50 438.50 150.50 34.50 58.50 292.50 720.00 1017.00 1374.50 6222.95
MIN 667.50 487.50 504.50 259.00 95.00 0.00 0.00 0.00 14.50 140.00 358.00 648.00 4406.46
NO YRS 55 55 56 57 57 57 56 55 56 57 54 54 46