BOULDER, COLORADO

Monthly Total Growing Degree Days

(050848)

Base Temperature = 50 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 125.00 15.50 1.03 a 141.53
1894 6.00 l 0.00 j 19.50 100.34 a 0.00 z 0.00 z 590.66 c 540.50 0.00 z 0.00 z 0.00 z 0.00 1251.01
1895 0.00 d 0.00 b 25.66 b 93.50 211.12 b 333.00 144.50 u 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 663.28
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 320.00 439.50 637.50 591.00 508.50 165.00 63.50 4.50 2729.50
1898 2.00 3.00 2.00 85.00 153.50 502.50 685.50 713.00 394.50 90.00 12.00 0.00 2643.00
1899 0.00 0.00 9.00 110.50 239.50 477.00 590.50 631.50 474.00 119.50 43.50 4.00 2699.00
1900 1.50 0.00 40.50 57.50 311.00 585.50 642.50 690.00 368.50 246.00 43.50 7.50 2994.00
1901 5.50 5.00 32.00 123.62 a 299.00 478.00 783.00 661.00 357.00 133.00 45.00 a 5.50 2927.62
1902 10.00 4.00 2.50 94.00 285.00 504.50 611.22 a 677.00 335.00 192.72 a 33.62 a 9.00 2758.55
1903 10.33 d 0.00 10.69 b 81.72 a 164.82 a 325.71 b 652.50 638.00 356.50 175.00 27.00 4.00 2446.28
1904 0.00 a 40.91 a 9.50 84.00 197.00 336.50 553.00 626.50 426.50 183.50 55.00 15.50 2527.91
1905 0.00 c 0.50 27.00 82.50 136.00 478.50 556.00 695.00 480.50 142.50 21.21 a 0.00 d 2619.71
1906 8.50 7.50 4.00 86.00 242.50 371.50 528.50 589.52 a 365.50 164.50 30.50 6.50 2405.02
1907 1.50 12.00 104.50 86.00 151.00 405.00 629.00 637.50 428.50 149.50 16.67 c 4.50 g 2621.17
1908 0.00 7.50 81.50 166.00 191.50 420.50 604.50 551.50 504.50 112.00 54.50 0.00 2694.00
1909 11.50 0.00 0.00 46.50 152.00 444.50 656.00 693.00 368.50 173.00 61.00 0.00 2606.00
1910 0.50 0.00 191.50 196.00 234.50 505.50 0.00 z 0.00 z 394.14 a 208.00 40.50 0.00 a 1770.64
1911 23.00 0.00 23.50 74.50 282.00 567.00 582.00 595.00 432.00 100.00 4.00 0.00 z 2683.00
1912 0.00 z 0.00 z 0.00 h 35.00 244.42 e 371.11 c 567.00 606.00 210.00 88.00 13.45 a 0.00 2134.98
1913 0.00 0.50 8.00 98.00 232.00 461.50 610.00 670.63 a 323.00 89.00 23.00 0.00 2515.63
1914 0.00 a 0.00 a 17.00 f 55.34 a 248.00 554.50 651.00 628.27 a 473.50 163.00 50.00 0.00 2823.61
1915 0.00 2.00 0.00 108.00 203.00 393.50 563.50 472.50 347.07 a 179.00 80.00 5.34 b 2353.91
1916 0.00 1.50 108.00 115.00 322.92 a 578.00 822.00 596.00 410.00 97.50 40.96 d 0.00 3091.88
1917 0.00 4.50 15.50 a 58.00 120.00 557.50 830.00 661.50 456.00 152.50 42.50 28.00 2926.00
1918 8.50 24.00 68.00 18.00 355.00 631.00 765.00 789.00 347.00 205.12 a 17.50 5.50 3233.62
1919 0.00 0.00 c 18.50 111.00 268.50 564.50 834.00 819.00 551.00 80.00 i 5.00 j 12.50 l 3166.50
1920 0.00 0.00 1.50 15.50 214.50 407.78 c 641.50 550.25 a 358.33 c 158.74 b 13.45 a 2.14 b 2363.69
1921 4.50 4.00 56.50 75.00 a 211.66 b 484.50 669.00 633.50 429.31 a 240.50 25.86 a 19.00 2853.33
1922 0.00 0.00 c 11.00 34.00 253.00 615.50 681.50 702.15 a 502.78 c 161.00 1.00 5.50 2967.43
1923 3.00 0.00 a 0.50 45.50 192.50 415.50 631.50 522.87 a 314.50 33.50 4.00 0.00 2163.37
1924 0.50 26.00 0.00 88.00 160.00 554.50 682.00 744.50 235.00 87.00 28.50 5.50 2611.50
1925 0.00 5.00 37.50 103.50 274.50 476.50 726.95 a 567.50 397.00 50.00 0.00 0.00 2638.45
1926 0.00 4.50 8.00 70.00 260.50 463.50 628.50 654.50 365.00 207.00 7.50 13.00 2682.00
1927 13.50 0.00 1.00 108.00 296.50 407.50 599.50 477.50 341.50 173.00 33.10 a 0.00 a 2451.10
1928 8.00 0.00 9.50 58.00 247.00 316.50 593.50 589.50 387.50 144.50 5.00 2.00 2361.00
1929 0.00 0.00 8.00 69.00 206.00 520.50 733.00 691.00 293.00 170.50 0.50 3.50 2695.00
1930 0.00 6.50 5.00 186.00 216.50 576.50 715.00 606.50 389.50 88.50 7.00 0.00 2797.00
1931 1.00 0.00 2.00 92.50 222.50 607.00 764.15 a 672.00 501.00 177.50 49.00 1.00 3089.65
1932 0.00 25.50 10.85 a 103.00 285.50 444.50 708.50 659.50 398.50 124.00 14.48 a 0.00 2774.33
1933 0.00 2.00 29.00 47.50 213.00 652.50 789.39 c 603.00 510.00 253.17 a 38.00 24.50 3162.06
1934 0.00 18.50 33.00 128.50 448.00 603.00 821.00 704.00 338.00 220.00 65.50 2.00 3381.50
1935 5.50 9.50 35.00 39.00 75.50 131.00 s 721.00 660.50 416.00 159.50 0.00 0.00 2121.50
1936 0.50 1.00 7.00 150.00 331.00 574.00 781.00 683.50 439.50 116.50 0.00 z 0.00 3084.00
1937 0.00 0.00 2.00 72.00 269.00 414.50 694.00 740.50 454.00 147.00 12.00 8.50 2813.50
1938 5.00 0.00 18.50 122.00 171.00 472.00 660.50 698.50 432.00 169.50 0.00 0.00 2749.00
1939 1.50 0.00 34.00 127.50 308.00 489.50 728.50 576.50 410.50 119.50 2.50 32.00 2830.00
1940 0.00 11.50 35.00 53.50 254.50 548.00 667.50 563.50 338.00 138.50 8.00 4.00 2622.00
1941 0.00 0.00 a 10.33 a 0.50 244.50 364.50 597.00 532.17 a 263.50 48.50 14.50 9.50 2085.00
1942 0.00 0.00 0.00 71.00 184.00 427.24 a 689.50 612.00 321.00 129.00 25.50 3.50 2462.74
1943 8.50 5.50 40.00 150.50 171.00 461.50 732.50 711.00 342.50 125.50 14.50 0.00 2763.00
1944 0.00 0.00 0.00 3.00 248.50 423.00 587.00 639.00 345.00 139.00 11.50 0.00 2396.00
1945 0.00 1.00 11.50 55.00 220.50 313.50 644.00 634.50 316.00 184.00 33.00 0.00 2413.00
1946 0.00 0.00 50.50 192.50 116.50 527.50 669.50 637.80 d 372.50 79.50 8.00 8.00 2662.30
1947 0.00 b 0.50 4.50 46.50 202.00 395.00 638.50 g 803.50 580.50 299.00 0.50 10.50 2342.50
1948 5.00 6.50 18.50 150.50 327.00 546.00 783.27 a 776.50 0.00 z 0.00 z 0.00 z 0.00 v 2613.27
1949 0.00 2.50 10.00 194.00 329.12 a 530.50 773.50 734.50 493.50 130.00 118.00 3.00 3318.62
1950 7.00 14.00 29.00 92.50 225.00 584.00 663.00 679.50 359.00 374.00 38.00 10.00 3075.00
1951 6.50 18.50 7.00 52.50 298.50 394.00 772.50 681.00 407.50 140.50 7.50 6.50 2792.50
1952 1.50 2.50 4.00 118.00 285.50 739.00 802.00 695.95 a 556.50 247.50 34.50 6.50 3493.45
1953 36.00 11.50 43.50 82.00 229.00 654.50 798.00 731.50 592.50 265.00 72.00 0.00 3515.50
1954 12.00 58.00 12.50 209.00 305.50 645.50 877.00 774.00 542.50 208.14 c 57.50 15.50 3717.14
1955 0.00 0.00 12.50 151.00 334.80 a 452.00 824.00 773.00 506.00 247.00 26.50 37.00 3363.80
1956 5.50 0.00 62.50 70.50 380.50 748.50 749.00 682.00 579.50 283.00 42.50 12.00 3615.50
1957 0.00 7.00 0.00 36.00 197.00 536.00 799.50 731.50 403.50 150.50 15.50 20.00 2896.50
1958 0.00 14.00 0.00 65.00 444.00 606.50 671.00 768.50 481.50 256.50 16.00 5.00 3328.00
1959 0.00 0.00 2.50 116.00 240.50 618.50 676.50 713.00 350.50 92.50 10.50 2.00 2822.50
1960 0.00 0.00 53.00 149.00 309.50 630.50 761.00 739.50 490.00 197.00 27.50 1.50 3358.50
1961 0.00 19.50 8.50 90.50 279.00 530.00 710.00 699.00 255.50 167.50 3.50 0.00 2763.00
1962 0.50 30.00 14.50 165.50 356.50 494.50 683.00 714.50 408.00 243.00 34.50 6.50 3151.00
1963 0.50 31.50 53.00 97.50 387.00 597.00 836.48 a 649.50 549.00 331.00 11.50 6.00 3549.98
1964 5.50 0.00 6.00 73.00 353.00 492.50 836.50 664.50 431.00 207.00 26.50 16.50 3112.00
1965 4.00 1.00 5.50 113.00 278.50 493.50 712.50 642.50 256.00 249.50 26.00 16.50 2798.50
1966 4.50 0.00 71.50 83.00 432.50 524.50 856.00 667.50 434.00 165.50 29.00 4.00 3272.00
1967 5.00 8.00 67.50 98.00 224.00 366.50 712.00 638.00 414.50 199.50 29.00 0.00 2762.00
1968 8.50 0.00 40.50 52.00 187.50 589.00 699.50 619.50 397.00 184.50 6.50 2.50 2787.00
1969 0.00 0.00 7.50 148.00 358.50 375.00 784.00 754.00 485.00 41.00 2.00 1.00 2956.00
1970 5.00 8.50 10.50 45.50 347.50 478.50 723.00 727.50 349.00 87.00 18.50 1.50 2802.00
1971 11.50 2.00 31.50 54.00 166.50 571.50 666.50 686.50 320.00 115.50 24.00 2.50 2652.00
1972 0.00 17.50 89.50 84.00 231.50 542.00 616.00 589.00 360.50 159.00 0.00 5.50 2694.50
1973 4.50 0.00 0.00 23.50 212.50 535.00 618.00 703.50 293.50 190.00 22.00 3.50 2606.00
1974 11.00 1.50 39.00 76.00 348.00 540.50 721.00 578.00 321.00 164.00 6.50 0.00 2806.50
1975 0.00 1.00 20.50 57.50 181.50 434.00 686.00 656.50 326.50 208.50 47.00 17.50 2636.50
1976 0.00 8.50 18.50 58.00 210.50 487.00 718.00 611.00 328.50 102.00 17.50 0.00 2559.50
1977 0.00 9.00 8.00 98.50 296.50 635.50 733.00 577.00 466.00 147.00 16.00 14.00 3000.50
1978 0.00 0.00 56.50 51.00 255.23 a 494.00 734.00 603.50 458.00 154.00 44.00 0.00 z 2850.23
1979 0.00 13.44 c 14.50 109.00 0.00 z 0.00 z 717.00 556.97 a 0.00 z 229.40 a 0.00 13.50 1653.81
1980 3.00 3.50 5.50 101.00 188.50 651.00 0.00 z 679.50 470.50 162.00 81.50 59.50 2405.50
1981 3.50 28.00 5.00 223.00 182.00 571.50 670.50 580.50 434.50 110.50 41.38 a 15.00 2865.38
1982 3.50 25.50 18.50 105.50 208.00 367.50 675.00 702.00 345.00 95.00 0.00 z 3.00 2548.50
1983 0.00 z 0.00 k 12.00 43.00 151.00 378.00 695.50 766.00 469.50 132.27 a 30.00 0.00 2677.27
1984 0.00 0.00 1.00 17.50 325.50 465.50 728.50 665.50 365.00 67.68 a 4.50 0.00 2640.68
1985 0.00 0.00 12.00 137.00 307.50 557.50 687.00 688.72 a 323.04 b 105.40 a 12.50 0.00 2830.65
1986 7.48 b 23.50 88.00 85.00 230.50 576.50 669.50 641.00 280.00 73.00 4.50 0.00 2678.98
1987 7.00 6.50 10.50 176.00 285.50 557.50 705.00 587.50 350.00 144.50 16.50 3.50 2850.00
1988 3.00 3.50 30.00 129.00 306.00 627.50 705.50 677.00 375.50 167.50 24.50 0.00 3049.00
1989 4.00 2.50 77.00 168.50 294.50 428.00 719.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1694.00
1990 0.00 z 0.00 z 0.00 z 59.50 179.50 598.50 577.50 582.00 441.00 178.50 72.00 6.50 2695.00
1991 0.00 0.00 13.00 65.50 274.50 497.00 634.50 594.00 353.00 214.50 9.00 0.00 2655.00
1992 0.00 8.50 4.00 166.00 288.50 387.00 567.50 505.00 432.50 181.50 0.50 0.00 2541.00
1993 0.00 0.00 22.50 60.00 248.50 436.00 603.50 0.00 z 265.50 94.00 0.00 0.00 1730.00
1994 0.00 0.00 41.00 105.50 340.00 593.50 650.00 646.50 439.50 85.77 a 12.00 0.00 2913.77
1995 0.00 16.50 52.50 48.00 77.00 370.00 635.00 743.00 350.00 121.50 48.50 23.50 2485.50
1996 2.50 19.50 5.00 106.00 289.50 508.00 665.00 604.00 346.50 182.00 21.50 9.00 2758.50
1997 26.50 4.00 60.50 41.00 241.00 493.50 663.50 579.50 423.00 167.50 0.00 z 0.00 z 2700.00
1998 5.50 0.00 41.00 51.00 274.50 393.50 705.50 0.00 z 511.00 77.50 0.00 z 0.00 z 2059.50
1999 0.00 z 0.00 z 0.00 z 0.00 z 204.50 443.50 723.50 598.50 277.50 138.47 a 72.41 a 3.50 2461.88
2000 0.00 0.00 8.00 109.82 b 366.00 519.31 a 755.00 714.00 430.00 75.00 0.00 0.00 2977.13
2001 0.00 0.00 4.00 104.00 308.50 555.50 775.00 677.50 450.00 165.00 35.00 0.00 3074.50
2002 8.50 10.50 13.00 155.00 220.00 615.50 831.00 660.50 422.00 61.50 8.50 0.50 3006.50
2003 11.00 8.50 34.50 109.50 254.50 385.00 800.50 709.00 319.00 273.50 22.50 0.50 2928.00
2004 0.00 4.50 85.00 90.00 328.00 381.50 594.00 508.50 387.50 90.00 17.50 2.00 2488.50
2005 18.50 0.00 19.00 62.00 271.00 462.50 776.50 611.00 485.50 145.00 56.50 4.50 2912.00
2006 11.50 14.00 13.00 166.00 357.50 647.00 755.50 668.50 258.50 141.00 57.50 9.00 3099.00
2007 0.00 3.50 75.00 68.00 260.50 529.50 767.50 730.50 433.00 195.00 73.00 6.00 3141.50
2008 0.00 0.00 10.50 77.50 239.00 480.50 775.50 608.50 327.00 144.50 65.50 5.00 2733.50
2009 23.00 4.00 67.50 71.50 0.00 z 388.00 605.50 604.00 400.50 33.50 35.00 0.00 2232.50
2010 0.00 0.00 26.50 43.50 185.50 509.00 696.00 695.00 496.50 179.00 26.00 0.00 2857.00
2011 0.50 5.00 37.00 62.07 a 164.50 527.00 728.50 779.00 399.50 167.50 14.50 0.00 2885.07
2012 5.50 0.00 135.00 164.50 331.50 724.00 768.50 719.00 478.00 136.50 31.55 a 10.00 3504.05
2013 0.50 0.00 a 26.87 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 27.37
Period of Record Statistics
MEAN 3.66 6.30 27.50 92.31 254.41 502.03 697.59 654.76 400.52 156.49 27.11 5.83 2842.06
S.D. 6.07 9.81 31.44 46.39 72.64 95.29 77.95 71.63 80.62 62.43 22.71 8.94 326.38
SKEW 2.63 2.39 2.16 0.60 0.16 0.15 0.08 -0.14 0.14 0.57 1.10 2.97 0.48
MAX 36.00 58.00 191.50 223.00 448.00 748.50 877.00 819.00 592.50 374.00 118.00 59.50 3717.14
MIN 0.00 0.00 0.00 0.50 75.50 313.50 528.50 472.50 210.00 33.50 0.00 0.00 2085.00
NO YRS 113 113 114 116 115 115 114 113 113 114 110 110 93