LEWISTOWN FAA AP, MONTANA

Monthly Total Growing Degree Days

(244985)

Base Temperature = 50 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 0.00 g 0.00 0.00 1.00 24.50 295.50 481.50 321.50 79.50 22.50 0.00 h 0.00 b 1226.00
1897 0.00 0.00 0.00 19.00 0.00 z 182.50 364.00 0.00 z 0.00 z 24.00 11.00 0.00 600.50
1898 0.00 0.00 0.00 35.50 54.00 226.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 316.00
1899 0.00 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 0.00 a 4.00 26.50 179.50 441.00 468.00 346.00 147.00 20.50 4.00 0.00 1636.50
1901 0.00 c 0.00 0.00 29.00 191.50 130.50 560.50 487.50 86.00 56.50 0.00 0.00 j 1541.50
1902 0.00 o 0.00 z 148.50 6.00 0.00 z 181.00 342.00 342.00 84.00 43.50 0.00 0.00 1147.00
1903 0.00 0.00 a 0.00 14.00 85.00 316.50 331.00 377.50 109.50 50.00 16.00 0.00 1299.50
1904 0.00 0.00 0.00 33.50 84.00 230.50 384.50 413.50 173.00 48.00 1.50 0.00 1368.50
1905 0.00 0.00 3.50 24.00 72.00 202.50 460.00 528.50 266.38 a 65.50 14.50 0.00 1636.88
1906 0.00 0.00 3.50 63.50 98.00 207.41 a 502.50 437.00 265.00 67.50 0.00 g 0.00 1644.41
1907 0.00 0.00 1.00 1.50 41.00 186.50 382.50 310.50 138.00 58.50 0.00 0.00 e 1119.50
1908 0.00 c 0.00 0.00 67.00 57.50 181.50 622.00 403.50 331.50 47.50 41.00 0.00 1751.50
1909 0.00 0.00 0.00 h 0.00 74.50 286.50 424.50 460.00 211.03 a 30.00 f 3.50 0.00 1460.03
1910 0.00 0.00 23.00 117.50 67.50 297.00 515.50 311.00 176.50 102.76 d 0.00 0.00 1610.76
1911 0.00 0.00 2.50 6.00 73.00 337.76 a 369.50 258.50 126.50 35.65 a 0.00 0.00 1209.41
1912 0.00 0.00 0.00 d 18.50 0.00 z 51.50 r 301.50 307.50 58.97 a 16.50 1.55 a 0.00 a 704.52
1913 0.00 a 0.00 a 0.00 a 35.69 a 111.17 b 332.07 a 353.92 a 413.16 b 199.66 a 27.90 a 1.03 a 0.00 a 1474.59
1914 0.00 a 0.00 a 12.92 a 16.03 a 121.86 b 193.45 a 556.97 a 374.58 a 187.76 a 54.77 a 5.36 b 0.00 a 1523.69
1915 0.00 a 0.00 a 0.00 a 94.14 a 71.82 a 113.28 a 297.60 a 343.50 l 29.00 g 38.23 a 0.00 a 3.10 a 618.16
1916 0.00 a 0.00 f 1.50 h 21.21 a 39.78 a 197.07 a 478.43 a 395.25 e 125.17 a 3.10 a 1.03 a 0.00 b 1261.05
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 0.00 8.00 6.11 c 82.50 450.52 a 460.50 379.50 171.00 82.00 0.00 0.00 1640.13
1919 0.00 0.00 1.00 29.50 221.50 459.50 610.00 552.00 233.00 7.00 0.00 0.00 2113.50
1920 0.00 0.00 0.00 0.00 59.00 221.00 522.50 462.50 226.50 73.00 1.50 0.00 1566.00
1921 0.00 2.00 3.50 19.50 88.50 378.00 478.50 497.00 93.50 78.00 6.00 0.00 1644.50
1922 0.00 0.00 a 0.00 9.00 91.50 387.50 461.00 576.50 353.00 112.50 1.00 0.00 1992.00
1923 0.00 0.00 0.00 28.00 105.50 290.50 569.00 459.00 204.50 17.00 j 0.00 z 0.00 z 1656.50
1924 0.00 z 0.00 0.50 0.00 z 87.83 d 203.28 a 489.50 296.00 f 222.50 75.00 0.00 7.50 1086.11
1925 0.00 0.00 3.00 42.50 191.00 334.50 612.25 a 532.00 216.21 a 6.50 0.00 0.00 1937.96
1926 0.00 0.00 0.00 77.50 160.50 294.50 543.00 408.50 52.50 29.00 2.50 0.00 1568.00
1927 0.00 0.00 0.00 34.50 36.50 238.50 457.00 343.50 165.00 94.03 a 0.00 0.00 1369.03
1928 0.00 0.00 a 10.50 27.50 228.50 144.00 549.00 318.50 155.50 28.50 0.00 0.00 1462.00
1929 0.00 0.00 0.00 b 0.50 85.00 215.00 488.00 531.50 89.00 42.50 0.00 1.00 1452.50
1930 0.00 0.00 0.00 28.45 a 99.00 291.00 592.50 587.50 232.00 7.00 2.00 0.00 1839.45
1931 0.00 0.00 0.00 31.50 176.50 392.00 540.00 497.50 235.00 82.50 20.50 0.00 1975.50
1932 0.00 14.00 0.00 24.00 155.50 300.50 527.00 447.50 150.00 33.50 0.00 0.00 1652.00
1933 0.00 0.00 0.00 9.50 80.50 440.50 580.00 410.00 168.50 64.50 0.00 0.00 1753.50
1934 0.00 0.00 0.00 40.00 285.50 278.50 522.50 446.00 142.50 87.50 18.50 0.00 1821.00
1935 0.00 0.00 0.00 5.50 45.50 219.50 535.50 408.00 211.00 64.50 0.00 0.00 1489.50
1936 0.00 0.00 0.00 49.50 284.00 407.50 698.50 506.50 217.00 53.50 6.50 0.00 2223.00
1937 0.00 a 0.00 0.00 16.00 158.00 312.50 572.00 433.50 274.50 62.50 0.50 0.00 1829.50
1938 0.00 0.00 0.00 25.00 88.50 324.00 492.50 421.00 357.50 66.00 0.00 a 0.00 1774.50
1939 0.00 0.00 7.50 68.50 186.00 175.50 536.50 448.50 236.50 28.00 4.50 8.00 1699.50
1940 0.00 0.00 0.00 8.00 136.40 a 318.50 571.95 a 517.50 312.50 75.43 a 0.00 0.00 1940.28
1941 0.00 0.00 0.50 2.59 a 135.50 258.46 d 512.05 c 472.50 101.00 14.00 0.00 1.00 1497.60
1942 0.00 0.00 0.00 35.00 j 79.50 158.00 490.50 419.50 196.00 96.50 1.50 o 0.00 z 1440.00
1943 0.00 z 0.00 z 7.00 o 43.00 82.00 177.50 467.00 401.50 199.00 127.50 0.00 0.00 1497.50
1944 0.00 0.00 0.00 3.50 151.00 162.00 388.50 347.50 194.50 105.00 0.00 a 0.00 1352.00
1945 0.00 0.00 0.00 4.00 42.50 137.00 500.00 474.50 149.00 65.50 6.00 0.00 1378.50
1946 0.00 0.00 10.50 48.00 42.00 203.00 502.50 392.50 147.00 9.00 0.00 0.00 1354.50
1947 0.00 0.00 0.00 17.50 72.00 134.50 576.00 443.50 183.00 82.50 5.50 0.00 1514.50
1948 0.00 0.00 0.00 32.50 119.50 219.00 375.50 444.50 231.50 66.50 0.00 0.00 1489.00
1949 0.00 0.00 0.00 a 35.00 163.50 208.50 430.50 521.00 141.00 10.00 18.00 0.00 b 1527.50
1950 0.00 0.00 0.00 5.50 64.00 182.50 374.00 338.00 182.50 57.50 8.50 0.00 1212.50
1951 0.00 a 0.00 0.00 11.38 a 89.00 92.00 504.50 352.50 90.52 a 34.00 0.00 0.00 1173.90
1952 0.00 0.00 0.00 86.00 75.50 274.50 422.50 442.00 263.79 a 59.50 0.00 0.00 1623.79
1953 1.00 0.00 4.00 16.00 43.00 209.50 489.50 505.30 a 238.00 113.00 15.00 0.00 1634.30
1954 0.00 0.00 0.00 6.50 96.50 155.17 a 540.00 404.00 187.50 50.00 9.00 0.00 1448.67
1955 0.00 0.00 0.00 0.00 44.50 199.50 472.00 556.00 210.00 91.97 a 0.00 0.00 1573.97
1956 0.00 0.00 6.50 4.00 170.00 358.50 497.00 387.50 211.50 69.00 7.00 0.00 1711.00
1957 0.00 0.00 0.00 20.00 117.50 237.00 571.00 444.50 197.00 55.00 0.00 0.00 1642.00
1958 0.00 0.00 0.00 6.50 259.50 163.00 327.00 537.00 219.00 106.00 0.00 0.00 1618.00
1959 0.00 0.00 0.00 20.00 30.00 281.50 488.50 440.00 174.00 22.50 1.00 0.00 1457.50
1960 0.00 0.00 8.00 14.00 88.50 238.50 624.00 397.00 228.00 76.00 0.00 1.00 1675.00
1961 0.00 1.00 0.00 0.00 135.00 469.00 561.50 631.50 96.00 68.50 2.50 0.00 1965.00
1962 0.00 1.00 0.00 54.50 34.00 279.00 357.50 391.50 134.50 45.00 2.00 0.00 1299.00
1963 0.00 0.00 2.50 17.50 97.00 244.50 513.00 516.00 368.00 164.00 0.00 0.00 1922.50
1964 0.00 0.00 0.00 10.50 101.00 236.00 558.50 358.50 90.50 67.50 0.00 0.00 1422.50
1965 0.00 0.00 0.00 14.00 46.50 175.00 435.50 414.00 28.00 81.50 5.50 0.00 1200.00
1966 0.00 0.00 5.50 2.00 177.00 178.50 545.50 398.00 324.50 68.50 0.00 0.00 1699.50
1967 0.00 0.00 0.00 0.00 99.50 179.00 508.50 561.00 305.00 42.00 0.00 0.00 1695.00
1968 0.00 0.00 0.00 20.50 21.00 160.50 414.00 339.50 148.50 41.00 0.00 0.00 1145.00
1969 0.00 0.00 0.00 35.50 115.00 192.50 424.00 556.00 233.00 7.00 0.50 0.00 1563.50
1970 0.00 0.00 0.00 4.00 77.00 333.00 539.00 546.00 137.00 30.00 0.00 0.00 1666.00
1971 0.00 0.00 0.00 1.00 93.00 237.50 400.50 692.00 156.50 60.50 8.00 0.00 1649.00
1972 0.00 0.00 16.00 6.00 107.00 319.50 340.50 496.50 127.50 38.00 0.00 0.00 1451.00
1973 2.00 0.00 0.00 0.00 112.50 280.50 480.00 558.50 197.00 66.00 7.50 0.00 1704.00
1974 2.50 0.00 0.00 32.00 39.50 351.00 547.00 303.00 145.50 77.50 4.50 0.00 1502.50
1975 0.00 0.00 0.00 0.00 47.00 157.50 526.00 350.50 158.50 56.00 27.50 1.50 1324.50
1976 0.00 0.00 0.50 19.50 97.50 172.50 499.00 459.00 243.50 66.50 0.00 0.00 1558.00
1977 0.00 0.00 0.00 46.50 96.50 311.00 397.00 265.00 127.00 28.00 0.00 0.00 1271.00
1978 0.00 0.00 3.50 9.50 59.00 219.50 338.50 316.50 219.50 22.00 4.50 0.00 1192.50
1979 0.00 0.00 0.00 5.50 64.00 269.00 473.00 467.50 293.00 77.00 0.00 0.50 1649.50
1980 0.00 0.00 0.00 95.00 126.50 235.00 507.50 298.50 199.50 91.50 16.00 3.50 1573.00
1981 3.00 1.00 0.00 21.50 87.50 152.50 448.50 527.00 266.50 38.00 15.00 0.00 1560.50
1982 0.00 1.00 0.00 6.00 52.00 227.00 432.50 505.00 203.50 46.00 0.00 0.00 1473.00
1983 1.50 0.00 9.00 27.50 89.00 231.00 467.00 629.50 150.50 43.00 7.00 0.00 1655.00
1984 0.00 z 0.00 0.00 23.00 99.50 228.50 550.00 588.00 150.50 65.00 0.00 0.00 1704.50
1985 0.00 0.00 0.00 76.50 208.00 259.50 593.00 309.50 82.00 22.50 2.00 0.00 1553.00
1986 0.00 2.00 19.50 21.00 148.00 401.50 351.50 479.50 61.50 33.00 0.00 0.00 1517.50
1987 0.00 0.00 6.50 83.00 164.50 329.50 427.00 281.50 213.50 57.50 3.00 0.00 1566.00
1988 0.00 0.00 1.00 38.00 169.00 524.50 539.00 471.50 181.00 74.00 4.00 0.00 2002.00
1989 0.00 0.00 0.00 35.00 72.50 260.00 576.00 427.00 194.50 47.50 9.50 0.00 z 1622.00
1990 0.00 z 0.00 z 0.00 z 0.00 z 84.50 294.50 497.50 546.50 350.00 62.50 30.50 3.00 1869.00
1991 0.00 0.00 0.00 20.00 129.50 281.00 517.00 646.50 290.50 103.50 0.00 0.00 1988.00
1992 0.50 2.00 0.00 50.50 146.50 325.00 294.00 397.50 146.50 89.00 0.00 0.00 1451.50
1993 0.00 0.00 6.50 0.00 151.50 192.00 208.50 290.50 93.00 47.00 0.00 0.00 989.00
1994 0.00 0.00 2.00 39.50 118.50 293.00 462.00 514.00 275.50 27.50 0.00 0.00 1732.00
1995 0.00 6.00 5.50 4.00 41.00 223.50 367.50 408.50 176.00 24.00 0.00 0.00 1256.00
1996 0.00 0.00 0.00 23.00 33.00 301.50 453.00 511.50 162.50 65.00 0.00 b 0.00 1549.50
1997 0.00 0.00 12.00 5.00 79.00 250.50 379.50 423.50 261.50 51.00 3.00 0.00 1465.00
1998 0.00 0.00 0.00 30.50 91.00 128.00 562.50 536.00 363.50 27.00 0.00 0.00 1738.50
1999 0.00 0.00 2.50 6.50 72.50 185.00 369.50 483.50 110.00 32.00 44.50 0.00 1306.00
2000 0.00 0.00 0.00 25.50 104.88 a 205.00 530.00 509.50 221.00 23.50 0.00 z 0.00 1619.38
2001 0.00 0.00 0.00 39.00 171.00 265.50 536.00 613.00 283.50 24.00 6.00 0.00 1938.00
2002 1.50 0.00 0.00 7.50 106.00 281.00 594.00 333.00 212.00 4.00 0.50 0.00 1539.50
2003 0.00 0.00 7.50 40.00 133.50 265.50 646.00 653.00 187.00 125.00 0.00 0.00 2057.50
2004 0.00 0.00 10.00 14.00 43.50 154.00 484.50 422.50 150.00 30.00 9.50 0.00 1318.00
2005 5.00 0.50 1.00 13.50 59.50 218.50 518.00 405.00 213.00 59.50 6.00 0.00 1499.50
2006 0.00 0.00 0.00 12.50 65.00 q 68.50 w 103.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 12.50
Period of Record Statistics
MEAN 0.17 0.29 3.56 24.74 104.25 253.67 479.70 444.46 190.10 54.91 4.44 0.29 1574.88
S.D. 0.68 1.52 14.92 23.83 55.67 85.51 88.27 94.29 73.72 30.57 8.15 1.20 244.53
SKEW 4.97 7.68 8.90 1.53 1.06 0.77 -0.42 0.24 0.33 0.61 2.85 5.13 0.24
MAX 5.00 14.00 148.50 117.50 285.50 524.50 698.50 692.00 368.00 164.00 44.50 8.00 2223.00
MIN 0.00 0.00 0.00 0.00 21.00 92.00 208.50 258.50 28.00 3.10 0.00 0.00 989.00
NO YRS 102 105 105 106 105 107 107 104 105 105 102 103 88