YELLOWSTONE PARK, WYOMING

Monthly Total Growing Degree Days

(489905)

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
1894 0.00 0.00 2.00 0.00 z 0.00 z 0.00 z 819.50 875.00 427.00 86.50 o 56.00 0.00 2179.50
1895 0.00 0.00 0.00 v 0.00 z 90.50 r 345.50 621.50 667.50 336.50 148.50 15.50 0.00 2135.00
1896 0.00 0.00 4.50 33.00 121.50 487.50 695.00 632.50 276.92 d 101.50 8.00 0.00 2360.42
1897 0.00 z 0.00 0.00 71.50 440.00 415.00 627.50 696.50 455.00 113.00 27.00 0.00 2845.50
1898 0.00 0.00 0.00 96.00 190.00 335.00 h 685.50 713.00 360.00 31.50 2.50 0.00 2078.50
1899 0.00 0.00 0.50 30.50 129.00 394.00 663.00 526.00 438.50 79.00 13.00 0.00 2273.50
1900 0.00 0.00 o 30.40 e 98.50 328.50 659.00 657.00 639.00 333.00 127.00 23.50 0.00 2895.90
1901 0.00 0.00 0.50 68.50 379.00 321.00 848.50 717.00 216.67 c 185.50 4.80 e 0.00 c 2741.47
1902 0.00 0.00 0.00 39.50 282.50 419.00 564.50 597.50 334.50 147.50 19.50 0.00 2404.50
1903 0.00 0.00 13.00 56.50 185.50 507.50 607.00 656.00 316.50 180.00 23.00 0.00 2545.00
1904 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
1905 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
1906 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
1907 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
1908 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
1909 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
1910 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
1911 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
1912 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
1913 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
1914 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
1915 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
1916 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
1917 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
1918 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
1919 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
1920 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
1921 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
1922 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
1923 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
1924 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
1925 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
1926 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
1927 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
1928 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
1929 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
1930 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
1931 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
1932 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
1933 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
1934 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
1935 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
1936 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
1937 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
1938 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
1939 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
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 0.00 z 0.00
1941 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 451.50 692.50 638.50 214.50 100.50 3.00 2.07 a 2102.57
1942 1.50 0.00 0.00 124.00 154.50 339.00 734.00 688.50 390.00 174.50 0.00 0.00 a 2606.00
1943 0.00 z 0.00 13.50 137.50 188.00 364.00 708.00 672.50 450.00 226.00 9.00 0.00 2768.50
1944 0.00 0.00 0.00 41.00 291.50 361.50 611.00 608.00 382.50 211.00 1.50 0.00 2508.00
1945 0.00 0.00 2.00 30.50 186.00 276.50 694.00 693.00 330.00 242.83 a 15.00 0.00 2469.83
1946 0.00 0.00 6.50 147.50 157.00 485.00 745.50 644.00 292.00 36.50 0.00 0.00 2514.00
1947 0.00 0.00 0.00 35.00 238.50 267.00 709.00 566.50 329.50 158.00 5.17 a 0.00 2308.67
1948 0.00 0.00 0.00 42.00 228.50 418.50 583.00 583.00 345.52 a 123.00 0.00 0.00 2323.52
1949 0.00 0.00 a 0.00 85.86 a 301.00 435.00 a 706.50 756.40 a 388.50 53.00 26.50 0.00 2752.76
1950 0.00 8.00 0.00 32.00 147.00 431.00 612.00 604.50 340.00 204.50 6.50 0.00 2385.50
1951 0.00 5.19 a 0.00 46.20 e 273.00 262.50 690.00 594.50 304.00 102.00 1.00 0.00 2278.39
1952 0.00 0.00 0.00 105.00 211.00 446.90 a 646.00 641.00 358.00 f 230.00 2.00 0.00 2281.90
1953 1.00 0.00 10.00 63.00 141.00 433.97 a 0.00 z 705.25 a 490.50 235.00 50.50 0.00 a 2130.22
1954 0.00 0.00 2.00 71.50 300.00 310.80 e 778.62 a 627.50 429.50 131.00 23.00 0.00 2673.92
1955 0.00 0.00 0.00 21.00 210.00 397.50 708.50 771.00 369.00 181.00 1.00 0.50 2659.50
1956 0.00 0.00 a 15.50 32.50 312.50 554.00 695.50 591.50 427.00 158.50 1.50 0.00 2788.50
1957 0.00 1.00 0.00 35.50 285.00 434.00 741.00 664.50 353.00 95.00 0.00 0.00 2609.00
1958 0.00 10.50 0.00 34.50 426.25 a 478.00 621.00 703.50 393.50 201.50 3.50 0.00 2872.25
1959 1.50 0.00 0.00 51.50 99.72 a 506.00 677.00 608.00 318.00 79.00 4.50 0.00 2345.22
1960 0.00 0.00 26.00 54.50 199.00 492.00 782.00 604.00 414.00 153.45 a 3.50 0.00 2728.45
1961 0.00 b 2.59 a 14.50 l 32.88 d 248.00 468.50 h 765.00 739.00 186.50 115.00 0.00 a 0.00 a 2088.98
1962 0.00 a 0.00 1.00 123.00 241.05 b 463.50 625.00 623.00 375.00 216.00 30.50 0.00 d 2698.05
1963 0.00 b 11.50 13.00 52.50 254.20 a 405.54 b 743.48 a 701.63 a 535.86 a 301.50 16.07 b 0.00 a 3035.29
1964 0.00 a 0.00 a 3.50 52.50 297.50 403.93 b 779.65 a 560.87 d 313.85 d 175.00 12.50 0.00 g 2599.30
1965 0.00 c 0.00 b 2.00 h 31.73 d 176.18 a 415.00 648.00 628.00 169.50 g 222.68 a 32.50 0.00 b 2154.10
1966 0.00 b 0.00 c 14.00 11.79 b 233.50 g 413.89 c 781.41 b 591.58 a 0.00 z 0.00 z 0.00 z 0.00 z 1812.67
1967 0.00 z 0.00 j 4.02 d 3.50 f 252.50 389.50 781.50 738.50 523.50 151.26 b 25.34 a 0.00 a 2866.12
1968 0.00 0.00 22.22 a 28.89 c 169.50 452.00 740.38 a 526.50 368.00 171.00 2.00 0.00 2480.49
1969 2.00 0.00 a 4.50 107.07 a 349.50 399.00 709.50 807.03 a 508.50 72.00 6.50 0.00 e 2965.60
1970 0.00 0.00 c 0.00 12.00 278.00 545.00 773.50 812.00 274.66 a 88.50 6.50 0.00 c 2790.16
1971 0.50 0.00 0.00 d 32.78 c 0.00 z 498.00 678.00 851.50 303.75 b 141.57 a 8.79 a 0.00 2514.89
1972 0.00 0.00 62.00 54.50 262.00 557.00 650.50 712.50 330.52 a 134.91 d 6.00 0.00 2769.92
1973 0.00 0.00 1.00 21.00 245.00 515.50 749.50 738.50 350.50 189.00 0.00 z 0.00 e 2810.00
1974 2.50 0.00 a 6.20 a 80.50 181.50 601.50 816.50 603.00 356.00 193.00 2.50 0.00 f 2843.20
1975 0.00 b 0.00 a 0.00 2.50 144.50 383.00 820.00 578.00 403.50 177.00 24.00 2.50 2535.00
1976 0.00 0.00 2.50 58.00 309.50 405.56 c 779.50 580.50 333.00 f 75.50 37.24 a 0.00 2248.30
1977 0.00 0.00 d 0.57 d 132.69 d 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 108.50 k 0.00 z 0.00 f 133.27
1978 0.00 z 0.00 z 0.00 z 58.89 c 123.50 j 499.50 733.50 649.00 427.50 174.00 j 9.00 z 0.00 z 2368.39
1979 0.00 g 0.00 0.00 65.00 276.93 a 481.55 a 786.00 693.00 523.89 c 217.55 c 2.07 a 0.00 3046.00
1980 0.00 a 0.00 a 0.00 g 151.67 c 258.00 g 466.07 b 739.35 a 575.05 a 413.08 d 125.50 f 46.61 b 6.50 2398.32
1981 0.00 0.00 d 0.55 c 102.12 d 215.00 f 378.60 e 0.00 z 0.00 z 0.00 z 23.00 o 27.50 i 0.00 i 481.27
1982 0.00 0.00 1.00 20.00 107.50 p 441.00 689.50 778.50 178.50 o 0.00 z 1.50 0.00 1931.50
1983 0.00 0.00 9.00 54.00 186.00 411.50 652.50 0.00 z 285.00 f 0.00 z 37.50 0.00 1350.50
1984 0.00 0.00 0.00 65.69 a 228.50 419.50 762.50 762.50 0.00 z 0.00 z 0.00 0.00 z 2238.69
1985 0.00 0.00 0.00 115.50 223.50 i 500.17 a 796.00 0.00 z 281.00 86.50 11.50 0.00 1790.67
1986 0.50 9.50 56.50 74.00 253.50 642.50 627.50 712.00 224.50 116.50 4.00 0.00 2721.00
1987 0.00 0.00 13.50 201.50 356.50 535.00 629.50 606.50 435.50 183.00 35.00 0.00 2996.00
1988 0.00 0.00 7.50 110.00 321.50 697.00 817.00 720.50 389.00 279.00 25.00 0.00 3366.50
1989 0.00 0.00 20.50 106.50 220.00 463.50 861.00 641.50 381.50 143.00 15.00 0.00 2852.50
1990 0.00 0.00 8.00 118.50 181.50 484.00 751.00 745.50 568.00 111.00 22.50 0.00 2990.00
1991 0.00 0.00 1.50 44.00 216.00 497.50 785.50 807.50 413.00 190.50 1.00 0.00 2956.50
1992 0.00 0.00 36.00 160.00 380.00 510.50 559.00 656.50 356.50 205.50 0.00 0.00 2864.00
1993 0.00 0.00 14.00 20.00 317.50 393.50 452.50 548.00 327.00 150.00 0.00 0.00 2222.50
1994 0.00 0.00 23.50 143.50 390.00 515.50 702.50 801.00 504.50 94.00 0.00 0.00 3174.50
1995 0.00 14.00 5.50 37.00 172.00 404.50 686.50 712.50 418.00 48.50 16.55 a 1.50 2516.55
1996 0.00 1.00 2.50 58.50 126.00 553.00 803.00 748.50 335.00 210.00 5.00 0.00 2842.50
1997 0.00 0.00 14.50 25.00 272.00 513.50 683.50 669.00 440.50 109.50 8.50 0.00 2736.00
1998 0.00 0.00 8.50 57.00 260.50 262.00 841.50 794.00 558.00 107.00 0.50 0.00 2889.00
1999 0.00 0.00 22.00 41.00 198.50 408.00 728.00 733.00 305.00 191.50 92.00 2.00 2721.00
2000 0.00 0.00 6.50 93.50 219.00 481.50 808.50 797.50 383.50 98.00 0.00 0.00 2888.00
2001 0.00 a 0.00 2.50 95.00 341.00 498.00 795.50 781.20 a 538.50 140.02 a 26.00 0.00 3217.72
2002 0.00 0.00 0.50 41.00 195.00 508.50 845.50 589.50 408.50 58.00 0.00 0.00 2646.50
2003 0.00 1.00 11.00 79.50 266.50 464.00 895.00 840.00 358.50 229.00 0.00 z 0.00 3144.50
2004 0.00 0.00 49.00 92.50 203.00 416.00 713.50 621.00 355.50 191.50 17.00 0.50 2659.50
2005 3.00 0.00 11.00 89.00 265.50 446.50 861.00 704.00 428.50 212.50 13.50 0.00 3034.50
2006 0.00 0.00 z 5.50 109.50 335.00 596.00 914.00 741.00 415.50 127.00 24.00 0.00 3267.50
2007 0.00 0.00 65.50 115.50 352.00 402.50 i 997.00 766.50 446.50 96.50 40.00 0.00 2879.50
2008 0.00 0.00 0.00 34.50 183.50 j 446.50 777.50 762.50 344.50 162.50 31.00 0.00 2559.00
2009 0.00 0.00 10.00 73.00 276.50 402.00 694.00 693.50 548.50 31.50 12.50 0.00 a 2741.50
2010 0.00 0.00 4.50 86.00 147.50 442.50 692.73 e 686.00 450.50 250.50 30.00 0.00 2790.23
2011 0.00 0.00 0.00 21.00 135.50 405.00 772.50 771.50 510.00 208.00 0.00 0.00 2823.50
2012 0.00 0.00 43.00 166.50 203.00 497.50 844.50 779.00 506.00 129.50 42.50 1.00 3212.50
2013 0.00 0.00 12.92 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 12.92
Period of Record Statistics
MEAN 0.16 0.82 9.45 69.80 244.44 449.65 727.39 684.17 387.42 150.84 14.75 0.22 2711.48
S.D. 0.55 2.74 14.64 42.44 77.58 84.51 89.72 82.25 84.98 60.78 16.74 0.88 266.15
SKEW 3.68 3.50 2.27 0.79 0.38 0.22 0.02 0.15 0.10 0.04 1.79 5.52 0.19
MAX 3.00 14.00 65.50 201.50 440.00 697.00 997.00 875.00 568.00 301.50 92.00 6.50 3366.50
MIN 0.00 0.00 0.00 2.50 99.72 262.00 452.50 526.00 186.50 31.50 0.00 0.00 2222.50
NO YRS 77 78 77 78 70 77 79 78 73 73 76 75 51