BOULDER, COLORADO

Monthly Total Growing Degree Days

(050848)

Base Temperature = 40 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 363.50 126.00 73.88 a 563.38
1894 46.00 l 1.50 j 143.00 325.86 a 0.00 z 0.00 z 900.66 c 850.50 0.00 z 0.00 z 0.00 z 29.00 2249.02
1895 2.87 d 16.69 b 95.67 b 349.50 514.17 b 633.00 244.50 u 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1611.91
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 628.00 739.50 947.50 901.00 803.50 409.50 191.00 43.50 4663.50
1898 32.50 68.00 44.50 307.50 398.50 799.50 995.50 1023.00 664.50 290.00 85.50 12.00 4721.00
1899 10.50 4.50 61.00 304.00 529.50 777.00 900.50 941.50 774.00 334.50 242.50 47.00 4926.50
1900 61.50 31.00 176.50 218.00 614.50 885.50 952.50 1000.00 648.00 534.00 187.00 101.50 5410.00
1901 66.00 38.50 136.50 276.72 a 604.00 778.00 1093.00 971.00 651.50 431.50 240.00 a 76.00 5362.72
1902 90.50 78.00 67.00 285.00 592.00 804.50 921.22 a 987.00 626.50 465.52 a 131.38 a 61.00 5109.61
1903 49.94 d 1.50 88.19 b 278.28 a 462.42 a 621.43 b 962.50 948.00 633.00 453.50 165.00 92.00 4755.75
1904 26.35 a 153.29 a 163.00 291.00 478.00 636.50 863.00 936.50 726.50 460.00 282.00 83.00 5099.14
1905 18.82 c 60.00 173.50 236.00 407.50 778.50 866.00 1005.00 780.50 312.00 169.14 a 43.63 d 4850.59
1906 98.50 80.50 59.50 323.50 541.00 671.50 838.50 899.52 a 663.50 412.00 157.50 123.50 4869.02
1907 55.00 170.00 268.00 264.50 352.00 705.00 939.00 947.50 718.50 439.50 132.78 c 71.00 g 4991.78
1908 57.50 70.50 226.00 398.00 468.00 720.50 914.50 861.50 786.00 319.50 194.50 30.00 5046.50
1909 101.50 30.50 22.50 157.50 433.50 744.50 966.00 1003.00 664.00 433.50 216.50 8.00 4781.00
1910 56.00 36.00 448.50 452.00 496.50 805.50 0.00 z 0.00 z 694.14 a 471.00 209.50 26.87 a 3696.00
1911 126.00 34.00 202.50 298.50 561.00 867.00 892.00 905.00 732.00 289.00 76.00 0.00 z 4983.00
1912 0.00 z 0.00 z 21.00 h 220.50 527.00 e 667.22 c 877.00 916.00 463.00 324.00 127.24 a 11.00 4132.96
1913 19.00 22.00 82.00 304.00 508.50 761.50 920.00 980.63 a 597.50 280.00 183.50 0.00 4658.63
1914 31.52 a 23.85 a 118.00 f 264.83 a 537.50 854.50 961.00 938.27 a 773.50 444.00 257.50 0.00 5086.46
1915 10.50 37.00 20.50 363.00 454.00 689.00 873.50 782.50 647.07 a 464.50 199.50 45.97 b 4587.03
1916 34.50 90.00 312.00 343.00 597.78 a 878.00 1132.00 906.00 705.00 329.00 150.00 d 34.00 5511.28
1917 28.50 40.00 69.75 a 224.00 342.00 849.50 1140.00 971.50 756.00 362.50 242.50 138.50 5164.75
1918 54.00 111.50 277.50 176.00 665.00 931.00 1075.00 1099.00 643.50 458.28 a 109.00 58.50 5658.28
1919 42.00 8.96 c 119.50 324.50 571.50 856.50 1144.00 1129.00 850.50 265.00 i 63.00 j 90.50 l 5046.46
1920 66.50 22.50 80.50 113.50 486.50 707.78 c 951.50 860.25 a 658.33 c 391.78 b 60.00 a 41.16 b 4440.29
1921 42.00 101.50 209.50 241.55 a 515.24 b 784.50 979.00 943.50 729.31 a 532.50 178.45 a 86.00 5343.05
1922 9.00 25.20 c 120.00 206.00 545.00 912.50 991.50 1012.15 a 802.78 c 393.00 43.50 55.00 5115.63
1923 65.00 12.44 a 47.00 226.00 478.00 715.50 941.50 832.87 a 607.50 193.00 100.00 16.50 4235.31
1924 34.50 116.00 10.50 268.00 438.00 854.50 992.00 1054.50 520.50 373.00 166.50 53.00 4881.00
1925 29.00 88.00 200.00 344.50 579.50 776.50 1036.95 a 877.50 697.00 161.00 75.50 35.00 4900.45
1926 15.00 67.00 86.00 245.00 551.50 763.50 938.50 964.50 635.00 487.50 138.50 68.00 4960.00
1927 67.50 63.00 73.00 310.50 596.00 704.50 909.50 787.50 628.50 445.50 176.90 a 4.13 a 4766.53
1928 74.50 17.00 109.50 223.50 524.00 614.00 903.50 899.50 687.50 366.00 86.00 23.50 4528.50
1929 3.50 0.00 102.00 235.00 485.50 820.50 1043.00 1001.00 564.50 424.00 43.00 113.00 4835.00
1930 4.50 116.50 72.50 468.50 478.50 876.50 1025.00 916.50 689.50 313.50 119.00 17.00 5097.50
1931 43.00 29.50 96.00 293.50 485.00 907.00 1074.15 a 982.00 799.00 446.00 163.00 43.50 5361.65
1932 13.50 128.50 82.67 a 327.00 594.00 744.50 1018.50 969.50 698.50 327.00 160.86 a 26.00 5090.53
1933 34.00 41.00 159.50 230.00 463.00 952.50 1099.39 c 913.00 810.00 560.07 a 232.50 164.50 5659.46
1934 40.50 92.50 202.50 370.00 750.00 903.00 1131.00 1014.00 620.00 530.00 216.00 48.50 5918.00
1935 100.00 90.00 157.00 199.50 299.50 241.00 s 1031.00 970.50 702.00 388.50 37.00 9.50 3984.50
1936 34.00 39.00 146.00 376.50 616.50 874.00 1091.00 993.50 718.00 324.50 0.00 z 42.50 5255.50
1937 0.00 16.00 79.50 254.50 563.00 706.50 1004.00 1050.50 748.50 407.50 123.50 48.50 5002.00
1938 41.00 68.50 135.50 322.50 427.00 772.00 970.50 1008.50 732.00 434.00 55.00 24.50 4991.00
1939 26.50 7.00 166.50 324.00 608.00 789.50 1038.50 886.50 704.00 368.00 121.00 155.00 5194.50
1940 8.00 60.00 159.00 216.50 554.50 848.00 977.50 873.50 635.00 399.00 72.00 37.50 4840.50
1941 8.00 18.15 a 63.03 a 104.00 548.50 664.00 907.00 842.17 a 519.50 256.00 144.50 71.50 4146.35
1942 12.00 4.00 34.50 291.00 450.50 725.17 a 999.50 922.00 599.00 334.00 147.00 44.50 4563.17
1943 66.00 102.00 147.50 429.50 398.00 760.00 1042.50 1021.00 642.00 394.50 127.00 9.00 5139.00
1944 22.00 29.50 24.50 119.00 523.00 723.00 897.00 949.00 644.00 416.00 131.50 17.50 4496.00
1945 46.00 26.00 139.50 168.00 496.50 608.50 954.00 944.50 580.00 452.50 168.50 24.00 4608.00
1946 15.50 56.00 201.00 453.50 367.50 824.50 979.50 947.80 d 657.00 266.50 79.50 117.00 4965.30
1947 35.81 b 41.50 82.50 221.50 475.00 676.50 878.50 g 1113.50 880.50 558.50 34.50 69.00 4188.81
1948 43.00 53.50 107.50 397.00 616.00 846.00 1093.27 a 1086.50 0.00 z 0.00 z 0.00 z 0.00 v 4242.77
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 63.00 113.50 425.50 649.50 947.00 1065.50 978.50 552.00 360.50 184.50 67.50 5507.00
2007 9.00 44.00 283.50 275.00 558.00 829.50 1077.50 1040.50 733.00 471.50 231.00 30.00 5582.50
2008 35.00 30.50 108.50 247.00 528.00 780.50 1085.50 918.50 627.00 371.00 209.00 47.50 4988.00
2009 125.50 83.00 218.00 256.50 0.00 z 688.00 915.50 914.00 693.00 191.50 171.50 16.50 4273.00
2010 16.00 0.00 126.50 264.00 435.50 808.00 1006.00 1005.00 796.50 462.50 118.00 65.00 5103.00
2011 46.50 54.50 191.50 270.00 a 424.00 827.00 1038.50 1089.00 699.50 419.50 135.50 33.00 5228.50
2012 93.50 9.50 365.00 434.50 624.50 1024.00 1078.50 1029.00 778.00 364.50 218.79 a 63.50 6083.29
2013 44.50 20.22 a 146.22 a 6.50 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 210.94
Period of Record Statistics
MEAN 46.91 59.15 139.43 293.28 539.20 800.74 1007.59 964.76 691.66 404.43 146.59 57.08 5165.71
S.D. 31.98 44.56 77.05 82.35 88.17 96.27 77.95 71.63 88.29 93.09 65.77 39.47 420.66
SKEW 0.99 1.06 1.05 0.18 -0.11 0.14 0.08 -0.14 -0.04 -0.08 0.46 1.24 0.38
MAX 176.00 236.50 448.50 502.00 753.50 1048.50 1187.00 1129.00 892.50 680.00 392.00 222.50 6378.20
MIN 0.00 0.00 10.50 104.00 299.50 608.50 838.50 782.50 463.00 161.00 6.50 0.00 4146.35
NO YRS 113 113 114 116 115 115 114 113 113 114 110 110 93