BLACKFOOT, IDAHO

Monthly Total Growing Degree Days

(100915)

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
1895 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 6.21 a 0.00 6.21
1896 4.50 10.50 75.71 e 133.00 290.88 a 692.50 923.00 850.00 510.50 204.00 41.00 2.21 c 3737.81
1897 1.00 0.00 2.00 192.50 642.00 705.50 847.50 887.12 a 570.50 205.50 76.50 0.00 4130.12
1898 0.00 19.50 6.50 278.00 436.00 732.50 928.50 920.00 494.00 48.00 g 22.50 0.00 3837.50
1899 0.00 0.00 10.50 143.50 338.00 659.00 737.00 f 708.50 521.50 118.50 40.50 0.00 2540.00
1900 0.00 0.50 93.50 173.50 530.00 890.50 834.00 800.00 496.00 75.50 t 32.50 0.00 3850.50
1901 1.50 2.50 17.00 178.50 662.00 687.50 1063.00 984.00 472.50 351.33 a 24.00 8.50 4452.33
1902 0.00 15.50 2.00 163.00 514.00 753.50 869.00 1042.50 0.00 z 29.00 u 26.00 2.00 3387.50
1903 0.00 0.00 57.00 137.00 379.00 780.00 903.00 0.00 z 0.00 z 92.00 q 12.50 0.00 2268.50
1904 0.00 1.74 d 15.00 202.50 345.00 772.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 g 1336.74
1905 0.00 5.50 81.00 238.50 376.50 609.00 904.50 896.50 574.00 154.50 10.00 0.00 3850.00
1906 0.00 6.00 12.00 203.50 390.50 485.50 871.50 806.50 558.00 283.00 73.50 8.00 3698.00
1907 0.00 13.00 50.50 181.50 364.50 474.00 813.00 704.00 497.00 337.00 11.00 1.00 3446.50
1908 0.00 6.50 59.79 c 266.00 270.00 473.50 880.50 751.50 530.50 164.50 14.00 0.00 3416.79
1909 3.50 0.00 16.50 101.00 288.50 640.00 825.50 887.00 542.00 242.50 67.00 0.00 a 3613.50
1910 0.00 0.00 126.00 323.00 446.92 a 652.00 902.50 699.50 530.50 263.50 45.00 0.00 3988.92
1911 1.50 0.00 56.66 b 137.50 374.50 664.00 775.00 700.00 467.50 121.50 3.00 0.00 b 3301.16
1912 0.00 0.00 a 4.00 116.50 332.00 611.90 a 647.00 620.50 276.92 d 89.00 21.50 0.00 2719.32
1913 0.00 0.00 15.50 167.07 a 469.13 a 633.50 785.50 845.50 489.50 132.50 26.00 0.00 3564.20
1914 0.00 0.00 30.00 235.00 512.50 591.00 888.00 808.00 418.00 246.50 44.50 1.50 3775.00
1915 0.00 0.00 74.00 343.50 341.00 503.50 787.50 877.50 488.00 281.50 63.50 9.00 3769.00
1916 0.00 0.00 68.00 207.50 251.50 545.50 894.50 800.00 521.50 102.50 l 11.50 0.00 a 3300.00
1917 0.00 0.00 13.29 c 136.00 340.00 525.50 948.50 767.50 592.24 a 251.50 58.50 43.50 3676.53
1918 0.00 0.00 67.50 119.00 312.00 839.00 862.00 702.50 481.00 143.50 2.88 d 1.00 3530.38
1919 0.00 0.00 34.00 226.50 476.50 736.00 965.00 912.00 564.00 84.00 16.50 0.00 4014.50
1920 1.50 0.00 12.00 90.50 368.00 601.00 915.00 830.00 512.00 178.00 27.00 0.00 3535.00
1921 6.00 0.00 39.30 c 113.28 a 428.50 712.00 883.50 828.50 425.50 310.00 a 54.50 0.50 3801.58
1922 0.00 0.00 7.00 57.50 350.50 759.00 865.00 898.00 618.00 311.00 1.50 0.00 3867.50
1923 0.00 0.00 14.43 b 139.50 431.50 505.00 949.12 a 800.00 559.50 117.00 13.00 0.00 3529.05
1924 0.00 1.00 4.50 158.50 487.50 600.50 866.00 777.50 487.50 196.50 32.50 0.00 3612.00
1925 0.00 a 11.00 74.00 236.00 503.00 603.50 952.96 d 747.62 a 332.00 68.95 b 8.00 2.00 3539.03
1926 0.00 6.00 47.00 315.52 a 457.50 733.50 924.00 875.00 381.50 224.50 29.00 18.71 b 4012.22
1927 0.00 0.00 10.50 142.50 320.50 676.00 924.00 776.00 414.00 252.00 74.00 4.00 3593.50
1928 0.00 0.00 52.00 144.00 558.50 534.50 903.00 745.00 523.00 190.00 20.50 0.00 c 3670.50
1929 0.00 0.00 1.55 a 63.00 291.00 517.00 868.00 864.38 a 318.50 162.00 0.00 20.00 3105.43
1930 0.00 6.09 e 31.00 326.00 357.50 582.00 919.00 848.50 515.00 127.50 2.00 0.00 3714.59
1931 0.00 0.00 21.00 179.50 401.00 727.00 951.00 833.50 500.00 213.50 49.50 0.00 3876.00
1932 0.00 c 0.00 8.27 a 152.50 386.00 582.00 864.00 813.00 466.00 128.00 18.50 0.00 3418.27
1933 0.00 0.00 7.50 141.50 259.00 743.00 939.50 754.00 470.17 a 0.00 z 10.50 9.50 3334.67
1934 2.00 8.00 134.00 341.38 a 605.00 624.31 a 981.50 896.00 489.50 292.00 74.50 0.00 4448.19
1935 0.00 0.00 15.50 156.00 368.00 615.50 668.00 i 843.00 608.00 215.50 0.00 0.00 2821.50
1936 0.00 0.50 7.00 358.00 612.00 747.50 1053.00 903.50 497.50 259.50 3.00 0.00 4441.50
1937 0.00 0.00 0.50 85.50 418.00 539.50 931.00 846.50 647.50 315.50 40.50 14.50 3839.00
1938 0.00 4.50 10.50 250.00 385.50 716.50 844.00 841.00 731.50 336.50 0.00 1.00 4121.00
1939 0.00 0.00 99.50 296.50 553.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 949.50
1940 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 3.00 3.00
1941 0.00 0.00 96.00 195.50 552.50 694.00 1003.50 905.50 480.00 265.50 89.48 a 19.50 4301.48
1942 0.00 0.00 5.00 297.50 311.00 f 368.50 o 1045.50 940.73 e 643.89 c 376.65 a 35.50 0.50 3345.27
1943 13.00 1.00 77.50 431.50 449.50 583.85 d 1009.57 a 974.50 718.50 403.00 51.50 2.00 4715.41
1944 0.00 4.00 17.50 192.00 531.28 b 603.00 944.00 911.50 634.00 432.50 40.50 0.00 4310.28
1945 2.00 1.50 59.50 177.50 522.50 583.50 1022.50 976.00 561.50 422.50 47.00 17.05 a 4393.05
1946 0.00 4.00 90.00 395.00 480.50 780.50 1091.50 971.00 582.00 187.50 23.50 39.50 4645.00
1947 3.50 2.00 i 95.50 159.00 540.50 519.00 943.50 835.00 498.00 0.00 z 5.50 0.00 3599.50
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 951.00 648.00 314.00 33.50 0.00 1946.50
1949 0.00 a 0.00 31.00 a 372.00 592.50 725.00 998.00 1004.00 675.50 177.00 100.50 0.00 4675.50
1950 4.50 23.69 b 33.50 215.69 a 410.50 674.50 921.50 890.00 603.00 418.50 74.50 0.00 4269.88
1951 0.00 16.50 19.50 258.62 a 541.00 578.00 995.00 847.00 572.50 214.00 27.00 0.50 4069.62
1952 0.00 0.00 0.00 278.50 542.50 720.00 910.00 938.50 670.50 390.00 15.00 0.00 4465.00
1953 22.00 25.00 77.00 184.50 316.50 662.00 1055.00 939.00 685.50 337.50 98.50 0.00 4402.50
1954 2.50 8.00 27.00 267.41 a 566.50 651.50 1066.00 901.50 635.50 241.50 f 86.00 0.00 4211.91
1955 0.00 0.00 12.50 128.00 462.00 705.50 966.50 1017.50 599.00 374.21 c 43.50 31.50 4340.21
1956 0.50 1.00 91.00 280.50 605.50 782.00 1013.00 872.50 640.50 305.50 12.00 1.50 4605.50
1957 0.00 20.00 55.50 185.00 533.00 763.50 1033.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2590.00
1958 0.00 z 0.00 z 0.00 z 0.00 z 687.37 e 410.50 n 486.50 l 590.00 j 340.00 j 202.50 h 0.00 z 0.50 m 687.37
1959 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 62.00 u 271.52 b 34.82 b 0.00 306.34
1960 0.00 a 0.00 145.70 a 291.72 a 440.72 a 752.50 1030.00 812.00 655.00 250.50 35.00 10.50 4423.64
1961 3.00 6.00 41.00 196.03 a 507.00 815.50 995.50 984.00 403.50 210.50 8.50 2.00 4172.53
1962 0.00 4.50 16.00 296.00 391.00 704.50 875.00 813.00 570.00 320.50 38.00 0.00 4028.50
1963 0.00 35.00 66.50 130.50 520.00 579.00 935.00 868.50 683.00 424.00 39.00 0.00 4280.50
1964 0.00 a 0.00 0.00 z 135.00 461.00 0.00 z 0.00 z 812.50 473.28 a 292.78 d 20.50 2.00 2197.05
1965 3.62 a 3.11 a 22.22 a 226.50 355.00 636.50 0.00 z 785.00 0.00 z 317.00 91.07 b 0.00 2440.02
1966 0.00 0.00 68.00 187.50 551.50 681.50 1009.00 888.00 691.55 a 221.00 64.00 1.00 4363.05
1967 6.50 5.50 78.02 a 117.00 461.00 637.50 971.85 a 915.57 b 650.50 267.00 65.00 0.00 4175.44
1968 0.00 10.00 69.50 140.00 405.00 658.00 944.47 a 506.00 j 503.08 d 236.50 20.00 0.00 2986.54
1969 15.00 0.00 31.50 247.00 575.50 633.50 918.00 937.00 653.00 130.50 35.50 8.50 4185.00
1970 12.50 9.50 28.00 64.50 435.00 647.50 855.00 861.00 347.50 152.50 29.00 1.00 3443.00
1971 10.00 0.00 36.00 139.00 451.00 613.50 875.00 899.50 406.50 177.50 16.50 2.58 a 3627.08
1972 0.00 11.50 136.00 147.00 428.50 660.00 800.00 804.00 434.50 274.00 22.24 a 4.50 3722.24
1973 0.00 0.00 2.00 132.50 479.00 662.00 884.50 858.50 523.50 278.48 a 55.00 3.00 3878.48
1974 13.00 2.00 59.93 a 185.50 421.00 783.50 922.50 778.50 533.50 243.00 27.00 1.50 3970.93
1975 0.00 0.00 a 13.50 33.50 318.00 612.50 980.63 a 746.30 d 529.14 a 256.02 b 24.64 b 6.64 c 3520.87
1976 0.00 d 0.00 g 11.07 c 134.44 c 495.40 e 571.07 b 920.04 c 746.30 d 612.93 a 183.33 b 43.45 a 0.00 b 3718.03
1977 0.00 c 0.00 0.00 z 0.00 z 367.50 815.00 890.50 831.00 536.50 289.50 39.00 12.00 3781.00
1978 0.00 1.50 142.00 196.00 362.00 617.50 872.50 779.50 527.00 0.00 z 0.00 z 0.00 z 3498.00
1979 0.00 0.00 32.00 187.80 e 460.87 a 690.00 0.00 z 0.00 z 0.00 z 0.00 z 10.50 1.11 c 1382.27
1980 0.55 c 22.27 a 15.50 322.78 c 404.50 635.50 909.85 a 805.50 576.43 b 284.50 0.00 z 24.36 c 4001.73
1981 3.10 a 13.50 38.50 252.00 408.00 0.00 z 875.00 928.50 606.72 a 198.50 68.89 c 0.00 z 3392.71
1982 0.00 a 11.00 26.00 127.00 372.50 631.03 a 847.50 908.50 508.50 149.00 0.00 z 0.00 i 3581.03
1983 2.00 9.50 59.50 102.50 354.95 a 583.97 a 807.50 948.50 226.50 p 136.00 l 47.50 l 1.55 a 2869.97
1984 0.00 e 0.00 b 2.50 136.00 481.00 593.50 932.00 927.00 502.50 188.50 15.50 0.00 b 3778.50
1985 0.00 u 0.00 0.00 293.00 521.00 721.50 1013.00 793.00 446.00 211.50 20.00 0.00 4019.00
1986 0.00 43.50 178.50 194.50 429.50 796.55 a 802.50 912.78 d 326.00 j 197.37 a 9.44 c 0.00 3564.64
1987 0.00 a 3.00 37.00 322.24 a 503.00 0.00 z 819.00 768.00 0.00 z 297.50 0.00 z 12.50 2762.24
1988 0.00 3.50 37.50 307.50 467.58 a 857.50 967.50 872.00 524.50 442.00 36.50 0.00 4516.08
1989 0.00 0.00 43.00 255.00 419.50 660.50 966.00 789.50 589.50 248.50 51.60 e 0.00 z 4023.10
1990 2.50 3.50 10.50 q 116.50 p 284.50 i 446.50 i 891.00 856.50 715.50 178.50 f 0.00 z 0.00 2469.00
1991 0.00 22.50 36.00 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 58.50
1992 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 685.50 748.00 833.50 493.50 302.00 5.00 0.00 3067.50
1993 0.00 0.00 52.50 103.50 471.00 518.50 315.00 o 690.50 481.50 219.00 5.00 0.00 2541.50
1994 0.00 0.00 59.50 244.00 515.50 656.00 849.00 881.50 612.50 194.50 4.00 0.00 z 4016.50
1995 3.00 0.00 z 56.50 126.00 326.00 520.86 a 755.00 802.90 a 535.00 184.50 85.34 a 11.50 3406.61
1996 0.00 7.00 50.50 168.00 326.50 662.50 857.00 802.00 459.50 249.00 17.59 a 4.50 3604.09
1997 6.00 0.00 58.50 k 141.00 459.50 663.62 a 776.00 867.50 632.00 217.50 21.00 0.00 3784.12
1998 1.00 0.00 53.00 134.00 403.00 0.00 z 0.00 z 911.00 700.00 207.00 0.00 z 6.72 a 2415.72
1999 0.00 c 6.46 b 84.39 d 0.00 z 0.00 z 609.83 a 853.07 d 869.19 e 360.50 i 216.00 h 95.00 f 1.03 a 2423.98
2000 0.00 f 13.96 b 20.50 x 340.56 c 464.48 a 688.20 e 921.98 b 933.21 b 0.00 z 191.50 h 0.00 e 0.00 3362.39
2001 0.00 z 0.00 z 1.00 z 193.50 f 405.00 g 703.45 a 837.00 f 1036.12 e 727.22 c 0.00 z 0.00 z 0.00 z 2466.79
2002 0.00 z 0.00 z 0.00 z 0.00 z 365.50 i 495.00 l 1088.00 843.00 643.00 168.00 0.00 r 6.50 2748.50
2003 11.00 14.50 99.50 230.50 430.50 h 583.50 g 1142.23 e 1012.27 e 613.00 402.50 9.50 4.65 a 3539.65
2004 0.00 2.00 174.67 e 280.00 465.50 702.00 980.50 877.00 559.50 299.50 19.50 3.00 4363.17
2005 0.00 0.00 z 52.50 192.00 455.00 612.50 1012.00 926.00 553.50 265.50 37.50 0.00 4106.50
2006 0.00 0.00 z 26.00 238.00 537.50 813.00 1134.50 907.00 372.50 i 241.00 80.00 2.50 3979.50
2007 0.00 b 6.00 152.13 d 242.50 548.46 e 0.00 z 1180.38 e 567.00 n 598.00 184.50 70.80 e 2.38 e 2985.16
2008 0.00 d 0.00 p 7.50 g 135.00 e 303.00 j 667.50 824.50 f 944.50 566.00 262.00 63.50 0.00 2638.50
2009 0.00 0.00 14.50 f 171.00 486.00 625.50 0.00 z 887.50 739.00 144.00 41.00 0.00 3094.00
2010 0.00 0.00 40.09 b 186.50 281.50 662.00 926.00 901.00 610.00 355.50 60.00 0.00 4022.59
2011 0.00 6.50 17.71 c 113.50 327.57 a 615.52 a 990.00 997.96 e 694.66 a 312.07 a 17.00 4.00 4096.48
2012 0.00 0.00 164.50 303.50 472.50 726.96 b 1060.50 1031.50 660.54 b 261.50 97.50 14.00 4793.00
2013 0.00 a 0.00 59.00 20.50 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 59.00
Period of Record Statistics
MEAN 1.49 4.76 47.97 200.17 441.40 658.70 924.55 859.92 550.22 246.60 34.77 3.90 3954.05
S.D. 3.65 7.86 42.16 81.15 94.32 88.29 91.34 84.33 95.69 85.07 26.48 7.81 425.64
SKEW 3.28 2.38 1.20 0.52 0.18 0.12 0.14 -0.13 -0.24 0.29 0.73 3.01 -0.15
MAX 22.00 43.50 178.50 431.50 687.37 890.50 1180.38 1042.50 739.00 442.00 100.50 43.50 4793.00
MIN 0.00 0.00 0.00 33.50 251.50 473.50 647.00 620.50 276.92 68.95 0.00 0.00 2719.32
NO YRS 109 105 104 106 105 102 100 106 100 96 102 107 66