BOULDER, COLORADO

Monthly Total Growing Degree Days

(050848)

Base Temperature = 40 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 1086.50 893.50 471.00 112.00 45.50 2608.50
1949 10.50 66.50 128.00 430.50 633.43 a 830.00 1083.50 1044.50 793.50 371.50 392.00 75.50 5859.43
1950 63.50 138.00 145.00 316.50 480.00 877.00 973.00 989.50 658.50 680.00 180.00 104.00 5605.00
1951 48.50 68.00 76.50 226.50 599.50 674.00 1082.50 991.00 704.00 374.00 124.00 40.00 5008.50
1952 61.00 71.50 64.50 342.50 579.50 1039.00 1112.00 1005.95 a 856.50 534.50 132.00 35.00 5833.95
1953 176.00 79.00 222.00 227.00 479.50 954.50 1108.00 1041.50 892.50 547.00 244.00 31.50 6002.50
1954 112.00 236.50 99.00 484.00 584.50 945.50 1187.00 1084.00 839.50 441.20 c 265.50 99.50 6378.20
1955 6.00 27.50 122.50 393.00 643.77 a 752.00 1134.00 1083.00 797.00 528.00 123.50 114.00 5724.27
1956 80.00 24.50 211.50 281.00 682.50 1048.50 1059.00 992.00 879.50 571.00 157.00 111.00 6097.50
1957 8.00 105.00 93.00 181.50 471.50 836.00 1109.50 1041.50 701.00 420.50 104.00 167.00 5238.50
1958 38.00 110.00 41.50 225.00 753.50 906.50 981.00 1078.50 774.00 510.50 170.50 63.50 5652.50
1959 46.00 10.00 96.50 313.00 527.50 918.50 986.50 1023.00 623.00 326.00 138.00 65.00 5073.00
1960 41.50 22.00 194.50 374.50 605.50 930.50 1071.00 1049.50 790.00 450.50 164.50 51.50 5745.50
1961 66.50 91.50 106.00 275.00 584.00 830.00 1020.00 1009.00 523.00 410.50 79.50 26.50 5021.50
1962 34.00 125.00 72.50 398.50 666.50 794.50 993.00 1024.50 706.00 543.00 214.00 77.00 5648.50
1963 25.50 117.50 163.50 354.50 695.50 897.00 1146.48 a 959.50 849.00 622.50 140.50 53.50 6024.98
1964 60.50 14.00 62.00 286.00 652.00 792.50 1146.50 974.50 731.00 489.50 142.50 75.50 5426.50
1965 64.50 61.50 43.00 360.50 573.00 793.50 1022.50 952.50 487.50 553.50 190.50 111.50 5214.00
1966 32.50 4.50 256.50 290.50 729.50 824.50 1166.00 977.50 733.50 422.00 153.50 57.50 5648.00
1967 74.50 62.00 265.00 330.00 478.50 666.00 1022.00 948.00 714.50 481.50 154.50 17.00 5213.50
1968 36.50 35.00 209.00 203.00 483.50 889.00 1009.50 929.50 697.00 471.50 78.50 47.50 5089.50
1969 70.00 27.00 81.50 418.50 660.00 666.50 1094.00 1064.00 785.00 161.00 121.50 80.00 5229.00
1970 63.50 70.00 66.50 183.50 647.00 778.50 1033.00 1037.50 625.50 264.00 129.00 48.00 4946.00
1971 91.50 46.50 138.00 257.00 449.00 871.50 976.50 996.50 577.00 362.00 116.00 33.50 4915.00
1972 52.50 116.00 286.00 289.00 522.50 842.00 926.00 899.00 660.00 396.00 19.00 58.00 5066.00
1973 52.00 24.00 45.50 156.00 497.50 835.00 928.00 1013.50 580.00 462.00 126.00 65.50 4785.00
1974 64.50 45.00 197.50 254.50 658.00 840.00 1031.00 888.00 605.50 440.50 90.50 25.50 5140.50
1975 40.50 42.50 117.00 212.00 458.50 727.00 996.00 966.50 622.00 485.00 166.00 99.00 4932.00
1976 48.00 140.00 110.50 278.50 508.00 787.00 1028.00 921.00 622.50 303.50 128.50 64.00 4939.50
1977 3.00 77.00 116.00 310.50 606.00 935.50 1043.00 887.00 766.00 431.00 143.00 108.00 5426.00
1978 4.00 10.00 201.50 284.50 509.95 a 786.00 1044.00 913.50 748.50 435.00 134.00 0.00 z 5070.95
1979 1.50 61.60 c 139.00 333.50 0.00 z 0.00 z 1027.00 866.97 a 0.00 z 504.78 a 40.50 108.00 3082.85
1980 38.00 64.00 66.00 271.00 482.50 951.00 0.00 z 989.50 770.50 400.50 229.00 222.50 4484.50
1981 69.00 150.00 105.00 502.00 467.50 871.50 980.50 890.50 734.50 333.50 228.10 a 103.50 5435.60
1982 41.00 133.00 164.00 317.50 492.50 667.50 985.00 1012.00 642.50 323.50 0.00 z 54.50 4833.00
1983 0.00 z 42.50 k 104.50 202.00 411.00 676.50 1005.50 1076.00 761.50 422.12 a 148.50 1.50 4809.12
1984 25.50 17.50 65.00 147.50 631.00 765.50 1038.50 975.50 630.50 242.83 a 82.50 30.50 4652.33
1985 5.50 21.50 121.50 366.50 611.50 857.50 997.00 998.72 a 579.11 b 374.07 a 69.00 26.00 5027.89
1986 118.66 b 139.50 286.00 325.00 523.50 876.50 979.50 951.00 578.50 331.00 115.50 5.50 5230.16
1987 60.00 78.00 111.50 390.50 588.00 857.50 1015.00 897.50 650.00 400.00 139.50 67.00 5254.50
1988 45.50 68.00 154.00 369.00 596.50 927.50 1015.50 987.00 668.00 457.50 144.50 36.00 5469.00
1989 69.50 25.50 258.00 377.00 595.00 727.50 1029.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 3082.00
1990 0.00 z 0.00 z 0.00 z 263.50 452.00 898.50 887.50 892.00 741.00 432.00 243.50 55.50 4865.50
1991 15.00 78.50 138.50 249.50 565.00 797.00 944.50 904.00 649.50 443.50 79.00 28.50 4892.50
1992 29.50 73.00 139.50 430.00 591.00 687.00 877.50 815.00 732.50 442.00 35.50 5.50 4858.00
1993 19.00 12.50 145.00 233.50 542.00 735.00 913.50 0.00 z 561.50 308.50 58.00 55.00 3583.50
1994 45.50 24.00 194.00 281.00 645.00 893.50 960.00 956.50 735.00 335.32 a 67.00 51.00 5187.82
1995 42.00 124.00 196.00 190.50 337.00 670.00 945.00 1053.00 617.50 357.50 219.50 89.00 4841.00
1996 57.50 157.00 80.00 316.50 584.00 808.00 975.00 914.00 624.00 417.00 119.00 91.00 5143.00
1997 93.50 36.00 242.00 183.50 540.50 793.50 973.50 889.50 720.50 415.00 0.00 z 0.00 z 4887.50
1998 43.00 21.00 131.50 210.00 581.50 680.50 1015.50 0.00 z 811.00 323.00 0.00 z 0.00 z 3817.00
1999 0.00 z 0.00 z 0.00 z 0.00 z 483.00 743.50 1033.50 908.50 555.50 370.97 a 287.59 a 53.50 4436.05
2000 40.00 101.00 131.00 350.89 b 659.00 819.31 a 1065.00 1024.00 703.00 304.00 6.50 10.00 5213.70
2001 31.50 13.00 94.00 326.00 580.00 855.50 1085.00 987.50 750.00 429.00 209.00 24.00 5384.50
2002 64.00 55.50 103.00 396.00 501.00 915.50 1141.00 970.50 722.00 253.50 118.00 55.00 5295.00
2003 102.50 29.50 192.50 335.00 538.00 685.00 1110.50 1019.00 615.00 553.50 93.00 46.00 5319.50
2004 42.00 41.00 277.00 299.50 622.00 681.00 904.00 818.50 685.50 367.50 113.50 49.00 4900.50
2005 83.00 49.50 120.50 278.50 552.00 762.50 1086.50 921.00 785.50 409.00 212.00 79.00 5339.00
2006 100.00 63.00 113.50 425.50 669.60 a 948.89 c 667.00 k 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2320.49
Period of Record Statistics
MEAN 51.95 67.36 141.15 303.65 565.99 821.42 1026.84 974.36 701.07 419.49 142.45 62.92 5311.49
S.D. 32.82 48.14 66.25 81.84 83.75 97.19 71.53 67.76 95.66 96.72 70.39 40.09 388.14
SKEW 1.06 1.04 0.64 0.20 -0.14 0.08 0.13 -0.29 0.04 0.05 0.87 1.40 0.72
MAX 176.00 236.50 286.00 502.00 753.50 1048.50 1187.00 1086.50 893.50 680.00 392.00 222.50 6378.20
MIN 1.50 4.50 41.50 147.50 337.00 666.00 877.50 815.00 487.50 161.00 6.50 1.50 4652.33
NO YRS 55 55 56 57 57 57 56 55 56 57 54 54 46