WEST YELLOWSTONE, MONTANA

Monthly Total Growing Degree Days

(248857)

Base Temperature = 40 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201212
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
1924 0.00 a 0.00 0.00 8.50 99.00 263.50 482.00 413.00 231.35 d 4.98 c 1.11 c 0.00 b 1503.44
1925 0.00 c 0.00 d 3.00 f 7.50 l 122.50 f 242.50 p 587.50 439.00 247.24 a 12.50 0.00 b 0.00 b 1286.24
1926 0.00 e 0.00 d 0.00 b 49.00 f 252.00 403.93 b 608.00 506.50 99.11 b 59.50 0.00 0.00 g 1929.04
1927 0.00 e 0.00 i 0.00 f 8.00 k 94.66 c 402.00 590.00 420.57 a 237.50 40.30 a 0.00 0.00 c 1785.03
1928 0.00 g 0.00 l 1.00 6.35 d 260.50 236.38 a 574.03 b 382.50 228.75 b 42.76 b 0.00 a 0.00 1732.27
1929 0.00 k 0.00 c 0.00 d 1.11 c 75.20 d 301.50 568.00 611.00 87.50 g 1.07 b 0.00 0.00 1557.88
1930 0.00 0.00 f 0.00 f 13.85 d 0.00 z 213.00 558.50 545.50 221.50 29.00 0.00 0.00 e 1581.35
1931 0.00 c 0.00 c 0.00 j 17.00 55.50 o 0.00 z 600.88 a 517.50 117.00 n 19.78 b 12.00 0.00 1167.16
1932 0.00 0.00 0.00 a 9.00 161.00 336.67 c 555.62 e 472.50 217.50 18.08 a 0.00 0.00 1770.37
1933 0.00 0.00 0.00 11.50 65.50 445.18 b 691.62 b 502.20 a 250.50 94.07 b 0.00 b 0.00 2060.57
1934 0.00 0.00 1.00 108.50 314.00 340.00 641.50 561.50 188.00 110.00 2.50 0.00 2267.00
1935 0.00 0.00 0.00 5.00 79.00 337.50 619.50 511.50 304.00 94.50 0.00 0.00 e 1951.00
1936 0.00 0.00 0.00 h 69.50 261.00 492.00 778.00 589.50 245.69 a 56.00 0.00 b 0.00 c 2491.69
1937 0.00 g 0.00 g 0.00 f 4.00 j 195.41 c 346.03 a 610.00 528.03 a 334.66 a 59.79 c 0.00 d 0.00 d 2073.92
1938 0.00 g 0.00 f 0.00 f 24.31 a 126.50 401.50 554.00 518.00 380.00 59.00 0.00 0.00 2063.31
1939 0.00 0.00 0.00 41.00 232.50 278.00 648.50 551.00 318.00 20.67 a 0.00 0.00 2089.67
1940 0.00 0.00 0.00 6.50 236.00 426.50 626.50 592.00 337.00 51.00 0.00 0.00 2275.50
1941 0.00 0.00 0.00 12.50 201.50 d 384.50 610.50 557.50 135.00 16.50 4.50 0.00 1922.50
1942 0.00 0.00 0.00 20.00 97.50 284.00 639.50 582.00 258.00 57.00 0.00 0.00 1938.00
1943 0.00 0.00 0.00 21.00 117.00 288.10 a 569.00 508.00 274.00 88.00 0.00 f 0.00 1865.10
1944 0.00 0.00 a 0.00 1.00 163.00 268.50 505.50 448.00 224.00 56.00 0.00 0.00 1666.00
1945 0.00 0.00 0.00 13.00 120.00 234.00 548.00 482.00 170.50 73.50 3.50 0.00 1644.50
1946 0.00 0.00 0.00 49.00 77.50 353.50 619.00 522.50 209.00 9.00 0.00 b 0.00 1839.50
1947 0.00 0.00 8.27 a 2.00 l 0.00 z 145.00 l 595.50 485.50 275.50 79.00 0.00 0.00 1443.77
1948 0.00 0.00 0.00 z 19.00 i 204.08 a 425.69 a 560.07 a 518.50 257.50 48.00 0.00 0.00 2013.84
1949 0.00 0.00 a 0.00 a 32.00 203.00 361.50 594.50 572.50 245.69 a 8.00 0.00 b 0.00 f 2017.19
1950 0.00 b 0.00 0.50 0.50 80.00 327.00 500.00 477.00 257.00 71.50 0.00 0.00 1713.50
1951 0.00 0.00 0.00 5.00 187.55 a 206.50 548.50 451.50 192.93 a 41.50 0.00 0.00 1633.48
1952 0.00 0.00 0.00 37.00 150.50 363.50 522.50 547.00 343.00 78.00 0.00 a 0.00 c 2041.50
1953 0.00 0.00 0.00 a 11.00 67.50 308.00 693.00 578.00 348.10 a 93.52 a 0.00 0.00 2099.12
1954 0.00 0.00 0.00 d 16.50 203.50 268.00 674.00 493.50 264.50 23.50 0.00 0.00 1943.50
1955 0.00 0.00 0.00 0.00 103.00 308.00 630.50 624.50 263.50 70.55 b 0.00 0.00 2000.05
1956 0.00 0.00 2.00 22.00 264.50 432.50 616.00 465.50 296.00 85.50 0.00 0.00 2184.00
1957 0.00 0.00 0.00 4.00 190.50 361.50 631.50 568.00 264.50 51.50 0.00 0.00 2071.50
1958 0.00 0.00 0.00 10.50 337.00 412.00 509.50 620.00 220.50 83.50 0.00 0.00 2193.00
1959 0.00 0.00 0.00 21.00 52.00 468.50 604.50 544.00 261.00 38.00 0.00 0.00 1989.00
1960 0.00 0.00 0.00 24.00 112.50 411.50 717.50 483.00 305.00 54.50 0.00 0.00 2108.00
1961 0.00 0.00 1.00 11.50 168.00 524.00 665.50 652.00 127.00 52.50 0.00 0.00 2201.50
1962 0.00 0.00 0.00 24.50 151.00 404.00 534.50 480.00 271.00 97.00 0.50 0.00 1962.50
1963 0.00 0.00 0.00 6.50 186.00 310.50 599.50 607.00 411.50 154.50 0.00 0.00 2275.50
1964 0.00 0.00 0.00 5.00 173.50 308.50 675.50 451.00 184.50 51.50 0.00 0.00 1849.50
1965 0.00 0.00 2.00 14.50 84.00 311.00 578.00 485.50 96.00 73.50 1.50 0.00 1646.00
1966 0.00 0.00 0.50 2.50 245.00 350.00 711.50 519.50 354.00 10.50 0.00 0.00 2193.50
1967 0.00 0.00 0.00 0.00 161.50 334.00 652.50 633.00 358.50 30.00 0.50 0.00 2170.00
1968 0.00 0.00 2.00 9.00 104.00 337.50 682.00 438.50 226.50 31.50 0.00 0.00 1831.00
1969 0.00 0.00 0.00 19.00 269.00 304.00 615.50 646.87 a 316.00 8.50 0.00 0.00 2178.87
1970 0.00 0.00 0.00 0.00 149.50 430.00 654.00 674.50 153.00 32.50 0.00 0.00 2093.50
1971 0.00 0.00 0.00 0.00 127.50 382.00 582.50 705.00 146.00 63.50 0.00 0.00 2006.50
1972 0.00 0.00 1.00 1.50 169.00 411.00 531.50 566.50 164.50 47.50 0.00 0.00 1892.50
1973 0.00 0.00 0.00 0.00 c 134.50 356.00 610.50 577.50 203.50 72.00 1.50 0.00 1955.50
1974 0.00 0.00 s 0.00 c 14.00 89.50 491.50 678.50 486.50 268.50 54.50 0.00 a 0.00 2083.00
1975 0.00 0.00 0.00 0.00 61.00 283.50 689.50 435.50 254.50 83.50 0.00 0.00 1807.50
1976 0.00 0.00 0.00 1.00 177.00 339.50 659.00 490.00 290.00 38.00 0.00 q 0.00 1994.50
1977 0.00 0.00 0.00 d 70.86 a 114.50 546.00 620.00 513.50 230.00 21.59 c 0.00 0.00 2116.45
1978 0.00 0.00 6.00 10.50 108.00 367.50 585.50 472.00 254.50 52.91 b 2.50 n 0.00 l 1856.91
1979 0.00 j 0.00 h 0.00 z 2.50 x 171.50 384.50 652.00 555.50 342.50 89.00 0.00 0.00 2195.00
1980 0.00 a 0.00 z 0.00 p 0.00 x 157.00 336.00 595.00 405.50 255.50 69.00 11.00 0.00 1829.00
1981 0.00 0.00 0.00 a 51.50 156.00 366.00 575.50 583.50 323.00 9.00 0.00 0.00 2064.50
1982 0.00 0.00 0.00 0.00 87.00 331.50 543.50 596.00 265.00 31.50 0.00 0.00 1854.50
1983 0.00 0.00 0.00 4.50 131.00 302.50 513.50 656.50 251.00 38.50 10.50 0.00 1908.00
1984 0.00 0.00 0.00 1.00 137.00 307.00 622.50 566.00 190.00 59.42 a 0.00 0.00 1882.92
1985 0.00 0.00 0.00 32.50 191.50 373.50 631.00 409.00 136.00 18.00 0.00 l 0.00 1791.50
1986 0.00 2.50 7.50 18.00 174.00 487.00 487.50 592.00 0.00 z 20.50 0.00 a 0.00 1789.00
1987 0.00 0.00 0.00 98.00 246.00 421.50 525.00 446.50 306.00 56.00 11.00 0.00 2110.00
1988 0.00 0.00 0.50 42.50 211.00 559.00 680.00 570.00 266.00 142.50 1.00 0.00 2472.50
1989 0.00 0.00 2.50 10.00 i 134.00 378.00 716.00 524.50 236.00 53.00 0.00 0.00 2044.00
1990 0.00 0.00 0.00 49.00 120.00 372.50 641.50 590.00 430.50 45.50 0.00 0.00 b 2249.00
1991 0.00 b 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 646.50 289.00 88.00 0.00 0.00 1023.50
1992 0.00 0.00 1.00 72.00 323.00 450.50 488.00 286.50 l 227.50 61.00 0.00 0.00 1623.00
1993 0.00 m 0.00 o 1.50 0.00 251.50 302.00 365.50 450.50 229.50 62.00 a 0.00 0.00 i 1662.50
1994 0.00 a 0.00 0.00 61.00 293.00 234.50 o 634.00 652.00 384.50 21.00 0.00 a 0.00 a 2045.50
1995 0.00 0.00 0.00 6.50 105.50 330.00 570.00 548.00 12.00 z 10.50 0.00 0.00 1570.50
1996 0.00 0.00 0.00 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 0.00
1997 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
1998 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
1999 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
2000 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
2001 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
2002 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
2003 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
2004 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
2005 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
2006 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
2007 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
2008 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
2009 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
2010 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
2011 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
2012 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
Period of Record Statistics
MEAN 0.00 0.04 0.62 20.14 163.37 360.93 602.10 532.63 255.11 52.08 0.90 0.00 1991.70
S.D. 0.00 0.31 1.64 24.36 69.65 76.01 68.47 72.98 70.72 31.54 2.70 0.00 205.64
SKEW 0.00 7.75 3.53 1.80 0.55 0.44 -0.39 0.13 0.05 0.69 3.33 0.00 -0.23
MAX 0.00 2.50 8.27 108.50 337.00 559.00 778.00 705.00 430.50 154.50 12.00 0.00 2472.50
MIN 0.00 0.00 0.00 0.00 52.00 206.50 365.50 382.50 96.00 1.07 0.00 0.00 1503.44
NO YRS 67 63 62 62 67 67 71 71 68 72 68 68 45