LEWISTOWN FAA AP, MONTANA

Monthly Total Growing Degree Days

(244985)

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
1896 3.50 g 19.00 28.50 69.00 191.50 595.50 786.50 631.50 271.00 152.00 8.00 h 29.40 b 2773.90
1897 6.00 0.00 20.00 149.50 0.00 z 474.50 673.50 0.00 z 0.00 z 189.50 44.50 9.50 1567.00
1898 0.00 9.50 2.00 164.00 295.50 508.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 979.50
1899 1.50 f 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
1900 0.00 z 6.22 a 56.00 210.50 468.00 741.00 778.00 656.00 385.50 164.50 35.50 10.50 3511.72
1901 1.11 c 13.00 24.50 153.50 468.00 407.00 870.50 797.50 286.50 300.50 72.00 0.00 j 3394.11
1902 2.50 o 0.00 z 390.50 84.50 0.00 z 460.00 652.00 651.00 325.50 244.50 0.50 5.00 2813.50
1903 0.00 0.00 a 40.50 110.00 265.50 616.50 634.50 687.50 344.50 275.00 82.50 6.50 3063.00
1904 5.50 0.00 5.50 194.50 307.50 523.50 692.50 722.50 442.50 269.50 124.00 6.50 3294.00
1905 1.00 34.00 74.00 153.00 277.50 477.00 770.00 838.50 559.14 a 169.50 109.00 0.00 3462.64
1906 32.50 26.00 47.00 225.50 309.50 498.10 a 812.50 746.00 544.50 249.50 44.50 g 8.00 3499.10
1907 0.50 28.00 40.00 57.00 229.00 485.00 692.50 617.50 399.00 302.50 40.00 29.21 e 2920.21
1908 1.66 c 7.50 32.00 225.00 280.50 476.00 932.00 712.50 589.50 160.00 144.00 0.00 3560.66
1909 6.00 4.50 10.00 h 8.00 277.50 572.00 734.50 770.00 480.00 a 155.00 f 79.00 0.00 2931.50
1910 10.00 0.00 156.00 326.00 301.50 577.50 825.50 609.50 417.00 334.11 d 40.50 0.50 3598.11
1911 0.00 0.00 50.00 90.00 287.50 637.76 a 679.50 564.00 367.00 152.42 a 0.00 3.50 2831.68
1912 0.50 0.00 0.00 d 166.50 0.00 z 167.50 r 609.50 612.00 226.55 a 119.50 46.55 a 2.07 a 1783.17
1913 0.00 a 6.22 a 0.00 a 170.17 a 296.64 b 632.07 a 663.40 a 718.34 b 446.38 a 105.40 a 43.45 a 1.03 a 3083.11
1914 14.98 a 0.00 a 52.70 a 134.48 a 370.93 b 465.52 a 866.97 a 677.35 a 447.93 a 221.65 a 108.21 b 0.00 a 3360.73
1915 2.58 a 0.00 a 18.60 a 298.45 a 263.50 a 378.10 a 604.50 a 533.50 l 158.50 g 212.35 a 18.62 a 17.05 a 1813.76
1916 0.00 a 10.50 f 86.50 h 122.59 a 197.88 a 456.21 a 788.43 a 701.08 e 361.55 a 74.40 a 34.66 a 1.60 b 2738.40
1917 0.00 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 0.00 z 0.00 z 0.00
1918 0.00 z 11.50 114.00 67.78 c 303.00 747.41 a 763.50 689.50 453.50 282.50 24.50 31.00 3488.19
1919 30.00 0.00 33.00 194.50 452.50 753.50 920.00 862.00 498.50 87.50 36.50 26.50 3894.50
1920 9.50 0.50 18.00 18.50 287.00 504.50 832.50 768.00 504.00 211.50 43.00 13.00 3210.00
1921 2.50 55.50 55.00 122.00 314.00 675.00 781.50 807.00 324.00 324.00 68.00 0.00 3528.50
1922 0.00 0.00 a 0.00 89.00 324.50 687.50 771.00 886.50 652.50 331.50 35.50 6.00 3784.00
1923 3.00 0.00 10.00 135.50 349.50 590.50 879.00 769.00 487.50 117.50 j 0.00 z 0.00 z 3224.00
1924 0.00 z 5.50 10.50 0.00 z 335.83 d 482.07 a 799.50 546.00 f 484.00 299.00 52.50 30.00 2498.90
1925 0.50 15.00 59.00 218.50 444.50 622.50 921.22 a 842.00 456.21 a 83.00 20.50 25.50 3708.42
1926 0.00 13.50 42.00 261.50 451.00 591.50 853.00 718.50 249.50 198.00 45.50 7.00 3431.00
1927 4.50 4.00 23.00 124.00 170.00 534.50 767.00 653.00 424.00 284.17 a 13.00 0.00 3001.17
1928 5.50 0.00 a 64.50 104.00 501.50 417.50 859.00 625.00 423.00 153.00 28.00 0.00 3181.00
1929 0.00 0.00 6.95 b 56.50 261.00 507.50 798.00 841.50 270.00 216.00 6.50 11.00 2974.95
1930 0.00 22.50 0.50 255.52 a 310.00 580.00 902.50 897.50 513.00 122.50 67.00 4.50 3675.52
1931 23.50 6.00 35.00 198.00 415.00 692.00 850.00 807.50 500.00 288.50 82.00 9.50 3907.00
1932 0.00 68.50 14.50 150.00 417.00 592.50 837.00 752.50 431.00 157.50 52.00 6.50 3479.00
1933 2.00 0.00 26.50 114.00 319.00 740.50 890.00 715.50 429.00 254.00 69.50 24.00 3584.00
1934 11.50 25.00 52.50 237.00 581.50 573.00 832.50 754.50 362.50 292.00 131.00 0.50 3853.50
1935 29.50 25.50 13.50 85.00 246.00 515.50 845.50 718.00 489.00 261.50 13.00 0.00 3242.00
1936 2.50 0.00 14.50 201.00 580.00 706.00 1008.50 816.50 479.50 232.50 69.50 8.50 4119.00
1937 0.00 a 0.00 8.00 140.00 460.00 607.50 882.00 743.50 530.00 272.50 33.00 2.00 3678.50
1938 3.00 13.50 39.50 170.50 310.50 615.50 802.50 731.00 657.50 255.00 9.83 a 12.50 3620.83
1939 13.50 0.00 81.00 229.00 480.00 467.50 846.50 757.50 517.50 206.00 96.50 98.00 3793.00
1940 0.00 0.00 18.50 75.50 403.52 a 615.00 881.95 a 827.50 611.00 292.43 a 3.50 18.00 3746.90
1941 26.50 11.50 29.50 105.52 a 416.00 556.15 d 822.05 c 781.50 310.50 180.50 66.00 41.50 3347.22
1942 1.00 0.00 1.00 120.50 j 270.00 446.00 800.50 729.50 454.50 284.00 35.00 o 0.00 z 2986.50
1943 0.00 z 0.00 z 37.50 o 221.00 265.50 437.50 777.00 711.50 471.00 312.00 37.00 11.00 3243.50
1944 12.50 0.00 0.50 92.00 393.50 431.50 698.50 657.50 458.50 377.50 16.55 a 6.00 3144.55
1945 0.00 2.00 41.50 53.00 221.00 387.50 810.00 783.00 347.50 259.00 33.00 1.00 2938.50
1946 0.00 6.00 65.00 205.00 224.50 501.00 812.50 702.50 374.50 66.50 9.50 9.50 2976.50
1947 0.00 11.50 5.00 124.50 325.50 418.50 886.00 753.50 427.00 282.50 18.00 9.00 3261.00
1948 7.50 0.50 1.00 149.50 336.50 509.50 685.50 754.50 499.50 238.50 1.50 0.00 3184.00
1949 0.00 0.00 0.00 a 202.00 404.00 489.50 740.50 831.00 406.50 96.50 159.00 2.67 b 3331.67
1950 0.00 14.00 19.50 74.50 236.50 448.00 681.00 648.00 386.50 257.50 41.50 18.00 2825.00
1951 0.00 a 5.00 0.00 81.21 a 341.50 337.50 814.50 662.50 312.41 a 164.00 2.00 3.00 2723.62
1952 0.00 0.00 0.00 241.00 344.00 573.00 732.50 744.00 558.10 a 259.50 30.00 3.00 3485.10
1953 37.00 2.50 38.00 82.00 204.50 494.00 799.50 815.30 a 518.50 346.50 118.00 1.00 3456.80
1954 5.00 39.00 11.50 65.00 331.00 417.93 a 850.00 714.00 450.00 183.00 126.00 18.00 3210.43
1955 0.00 0.00 10.00 61.00 246.50 483.50 782.00 866.00 430.50 297.60 a 27.50 5.50 3210.10
1956 2.00 0.00 56.50 68.50 397.00 656.00 807.00 691.50 480.00 243.50 48.00 37.50 3487.50
1957 0.00 6.50 14.50 83.50 359.50 534.50 881.00 754.50 457.50 149.00 23.50 12.00 3276.00
1958 12.00 10.00 4.00 95.50 561.00 452.50 636.00 847.00 471.00 291.50 30.00 12.00 3422.50
1959 9.50 0.00 8.50 121.00 178.00 575.50 797.00 750.00 397.00 147.00 23.00 16.50 3023.00
1960 1.00 0.00 78.00 99.00 307.50 529.50 934.00 707.00 491.00 252.50 26.00 16.50 3442.00
1961 16.50 34.00 48.00 61.50 365.00 769.00 871.50 941.50 263.00 207.50 27.00 1.50 3606.00
1962 16.50 29.00 11.50 200.50 283.00 562.50 667.50 694.00 384.00 244.00 66.00 24.50 3183.00
1963 4.50 26.00 68.00 110.50 310.00 543.50 823.00 826.00 665.00 405.00 44.00 14.00 3839.50
1964 6.00 3.50 13.00 76.50 338.00 530.00 868.50 664.00 341.50 266.00 29.50 0.00 3136.50
1965 0.50 1.00 0.00 92.50 211.00 465.00 745.50 715.50 144.00 319.00 42.00 14.50 2750.50
1966 2.00 0.00 57.00 68.00 394.50 464.00 855.50 706.00 614.50 223.00 39.50 20.50 3444.50
1967 0.00 4.50 7.50 31.50 299.50 461.00 818.50 871.00 596.50 243.50 54.00 2.50 3390.00
1968 8.00 11.50 57.00 84.00 195.50 441.00 721.50 646.00 392.00 179.00 23.00 4.00 2762.50
1969 0.00 0.00 8.00 203.50 347.50 459.00 734.00 866.00 527.00 77.50 48.00 12.00 3282.50
1970 0.00 2.00 4.00 40.50 313.50 629.00 849.00 856.00 363.50 127.50 24.00 12.50 3221.50
1971 1.50 0.00 13.00 97.50 337.50 534.50 710.50 1002.00 364.50 209.00 52.00 0.00 3322.00
1972 1.50 3.00 119.50 81.50 330.50 619.50 638.50 806.50 354.50 169.00 15.00 23.50 3162.50
1973 45.50 13.00 21.00 60.50 356.50 561.00 790.00 868.50 461.00 251.00 47.50 34.50 3510.00
1974 25.00 1.00 38.00 185.00 215.50 647.00 857.00 612.00 397.00 283.50 45.50 5.00 3311.50
1975 0.00 0.00 0.00 17.50 228.50 448.00 836.00 660.50 426.00 209.00 112.50 19.50 2957.50
1976 21.00 22.50 31.00 136.00 377.00 458.00 809.00 769.00 531.00 189.50 47.00 6.00 3397.00
1977 0.00 1.50 5.00 211.00 317.50 611.00 707.00 572.50 388.50 188.50 20.50 4.00 3027.00
1978 0.00 0.00 35.00 103.50 273.50 507.00 648.50 618.00 461.50 174.00 52.00 0.00 2873.00
1979 0.00 0.00 0.00 52.00 233.00 554.50 783.00 777.50 590.50 255.00 19.50 44.50 3309.50
1980 3.50 9.00 4.50 272.00 402.00 528.50 817.50 608.50 471.00 248.50 85.00 60.50 3510.50
1981 24.00 38.50 23.00 157.50 311.00 425.00 758.50 837.00 540.50 158.50 118.00 13.00 3404.50
1982 0.00 36.50 10.50 90.00 232.50 515.00 742.50 815.00 432.50 206.50 16.50 10.00 3107.50
1983 22.00 46.00 61.00 125.50 290.50 530.00 776.50 939.50 375.50 245.50 61.00 0.00 3473.00
1984 0.00 z 11.00 11.50 127.00 313.00 520.50 860.00 898.00 350.50 189.00 27.00 2.50 3310.00
1985 0.00 0.00 4.50 234.00 486.00 553.00 903.00 611.50 263.00 149.50 26.50 0.00 3231.00
1986 22.00 33.50 105.00 110.50 327.00 701.50 661.50 789.50 264.50 221.00 23.50 0.00 3259.50
1987 16.00 32.50 50.00 275.00 439.00 625.50 737.00 591.50 505.50 211.50 66.00 20.00 3569.50
1988 10.50 20.50 38.50 181.00 438.50 824.50 849.00 781.50 432.50 295.50 45.00 22.50 3939.50
1989 6.50 0.00 31.50 121.00 313.50 557.00 886.00 737.00 458.50 212.50 57.50 0.00 z 3381.00
1990 0.00 z 0.00 z 0.00 z 0.00 z 286.00 585.50 807.50 856.50 648.00 214.00 116.50 41.50 3555.50
1991 2.50 60.50 35.50 118.00 377.50 581.00 827.00 956.50 577.50 246.00 20.00 2.00 3804.00
1992 25.00 50.50 73.00 196.50 417.50 619.50 600.50 677.00 403.50 253.00 13.50 0.00 3329.50
1993 0.00 0.00 55.50 88.50 429.50 473.50 517.00 588.50 339.50 191.50 5.00 8.00 2696.50
1994 1.00 2.50 62.00 166.00 398.50 579.50 772.00 823.50 567.50 134.00 5.00 14.50 3526.00
1995 15.50 50.00 62.50 35.00 237.00 497.50 677.50 718.50 418.00 125.00 63.00 2.00 2901.50
1996 10.00 18.50 14.50 108.50 197.50 601.00 763.00 821.50 388.00 196.50 8.04 b 4.00 3131.04
1997 10.50 10.50 60.00 66.00 309.50 549.00 684.00 733.00 555.00 166.00 35.00 1.00 3179.50
1998 3.50 0.00 29.00 144.00 370.50 385.50 872.50 846.00 648.50 186.50 41.00 14.00 3541.00
1999 1.00 19.00 76.50 88.00 268.00 480.00 676.00 793.50 337.00 208.50 164.50 1.00 3113.00
2000 0.00 13.50 29.00 159.00 344.62 a 496.50 840.00 819.50 483.00 152.50 0.00 z 0.00 3337.62
2001 2.00 0.00 7.50 132.50 425.00 550.50 846.00 923.00 581.50 165.00 112.00 3.00 3748.00
2002 16.00 0.50 0.00 64.00 275.00 558.00 904.00 643.00 468.00 77.00 59.50 8.00 3073.00
2003 16.00 0.00 63.50 190.00 324.00 553.00 956.00 963.00 433.50 329.00 15.50 6.00 3849.50
2004 0.00 0.00 95.50 149.50 238.50 435.50 794.50 732.50 415.50 168.00 70.00 13.00 3112.50
2005 47.00 24.50 40.50 127.00 289.00 506.00 828.00 711.50 484.00 241.00 61.00 8.50 3368.00
2006 28.00 14.00 19.00 167.50 169.50 q 138.50 w 153.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 228.50
Period of Record Statistics
MEAN 7.53 11.17 35.83 133.88 329.87 541.83 789.06 752.78 442.38 218.11 48.86 11.51 3337.35
S.D. 10.65 15.38 46.14 67.03 87.54 93.44 88.98 95.71 102.49 70.48 36.95 14.54 314.22
SKEW 1.71 1.65 4.65 0.52 0.62 0.58 -0.43 0.23 -0.07 -0.03 1.15 2.81 0.11
MAX 47.00 68.50 390.50 326.00 581.50 824.50 1008.50 1002.00 665.00 405.00 164.50 98.00 4119.00
MIN 0.00 0.00 0.00 8.00 170.00 337.50 517.00 564.00 144.00 66.50 0.00 0.00 2696.50
NO YRS 102 105 105 106 105 107 107 104 105 105 102 103 88