YELLOWTAIL DAM, MONTANA

Monthly Total Cooling Degree Days

(249240)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201304
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
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 205.00 271.50 121.00 7.00 0.00 0.00 604.50
1949 0.00 0.00 0.00 10.00 34.00 96.50 281.00 314.65 a 34.50 0.00 0.00 0.00 770.65
1950 0.00 0.00 0.00 0.00 a 4.50 46.50 139.50 158.00 97.00 0.00 z 0.00 z 0.00 z 445.50
1951 0.00 z 0.00 i 0.00 j 0.00 21.00 12.00 254.50 171.50 13.93 b 3.50 0.00 z 0.00 z 476.43
1952 0.00 0.00 0.00 9.00 5.00 129.00 230.50 200.00 i 0.00 z 0.00 z 0.00 z 0.00 z 373.50
1953 0.00 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
1954 0.00 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
1955 0.00 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
1956 0.00 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
1957 0.00 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
1958 0.00 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
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 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1960 0.00 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
1961 0.00 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
1962 0.00 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 0.00
1963 0.00 a 0.00 0.00 2.00 13.50 78.00 290.50 277.50 129.83 a 31.50 0.00 0.00 822.83
1964 0.00 0.00 0.00 2.00 35.50 81.00 380.50 195.50 8.50 5.50 0.00 0.00 708.50
1965 0.00 0.00 0.00 0.50 1.50 42.00 275.50 199.50 2.00 15.50 0.00 0.00 536.50
1966 0.00 0.00 0.00 0.00 71.00 79.00 394.00 221.50 106.50 0.00 0.00 0.00 872.00
1967 0.00 0.00 0.50 0.00 19.00 19.50 252.50 264.00 104.00 0.50 0.00 0.00 660.00
1968 0.00 0.00 0.00 6.50 3.50 72.00 261.50 174.50 46.00 5.00 0.00 g 0.00 569.00
1969 0.00 0.00 0.00 2.00 43.50 72.50 220.00 379.50 86.50 0.00 1.00 0.00 805.00
1970 0.00 0.00 0.00 0.00 31.50 146.00 333.00 387.00 76.50 21.50 0.00 0.00 995.50
1971 0.00 0.00 0.00 0.00 10.00 110.50 227.50 425.50 55.00 8.00 0.00 0.00 836.50
1972 0.00 0.00 4.50 0.00 38.50 156.50 200.00 277.50 38.50 0.00 0.00 0.00 715.50
1973 0.00 0.00 0.00 0.00 a 31.50 150.00 280.00 331.00 35.50 4.00 0.00 0.00 832.00
1974 0.00 0.00 0.00 12.50 10.00 183.00 354.50 116.50 40.50 8.50 0.00 0.00 725.50
1975 0.00 0.00 0.00 0.00 10.00 30.50 318.00 159.00 49.50 9.00 3.00 0.00 579.00
1976 0.00 g 0.00 a 0.00 0.00 9.00 63.50 336.00 245.50 95.50 8.50 0.00 0.00 758.00
1977 0.00 0.00 0.00 4.00 21.50 182.00 311.00 155.00 55.00 7.50 0.00 0.00 736.00
1978 0.00 0.00 0.00 0.00 18.50 108.00 227.50 216.00 122.00 7.23 a 0.00 c 0.00 699.23
1979 0.00 c 0.00 0.00 b 0.50 34.00 144.00 275.38 a 276.00 147.50 21.50 0.00 0.00 898.88
1980 0.00 0.00 0.00 20.00 46.00 105.50 345.00 163.50 77.50 34.74 b 2.00 0.00 794.24
1981 0.00 0.00 0.00 c 14.50 8.27 a 45.00 268.00 273.50 138.00 1.50 1.50 0.00 750.27
1982 0.00 1.50 0.00 0.00 8.50 62.50 235.00 330.50 85.00 5.50 0.00 0.00 728.50
1983 0.00 0.00 0.00 0.00 22.50 90.00 342.50 469.00 121.50 0.00 0.00 0.00 1045.50
1984 0.00 0.00 0.00 0.00 46.50 116.00 352.50 402.48 a 66.50 5.00 0.00 b 0.00 b 988.98
1985 0.00 a 0.00 0.00 12.50 55.50 131.50 397.00 212.00 35.00 2.00 0.00 0.00 b 845.50
1986 0.00 0.00 13.00 6.50 34.50 202.00 203.50 271.50 11.00 9.00 0.00 0.00 751.00
1987 0.00 0.00 0.00 16.50 68.00 161.00 225.00 131.00 44.00 24.00 0.00 0.00 669.50
1988 0.00 0.00 0.00 0.00 60.50 368.00 388.50 267.50 59.50 4.00 0.00 0.00 1148.00
1989 0.00 a 0.00 0.00 9.50 7.00 114.00 378.00 241.00 73.50 2.00 0.00 0.00 825.00
1990 0.00 0.00 0.00 2.00 3.50 131.00 274.00 306.00 184.50 9.50 0.00 0.00 910.50
1991 0.00 0.00 0.00 5.50 13.50 115.50 330.00 386.50 82.00 31.50 0.00 0.00 964.50
1992 0.00 0.00 0.00 15.50 41.50 137.50 139.00 189.50 64.50 29.00 0.00 0.00 616.50
1993 0.00 0.00 0.00 0.00 25.50 91.00 59.00 142.50 43.00 8.50 0.00 0.00 369.50
1994 0.00 0.00 0.00 6.00 37.00 191.50 296.50 359.00 81.00 1.00 0.00 0.00 972.00
1995 0.00 0.00 0.00 a 0.00 0.00 124.00 240.00 328.00 92.00 9.50 0.00 0.00 793.50
1996 0.00 0.00 0.00 8.00 0.00 184.00 310.00 350.50 76.00 14.50 0.00 0.00 943.00
1997 0.00 0.00 3.00 0.00 29.50 128.50 218.00 226.00 122.50 22.50 0.00 0.00 750.00
1998 0.00 0.00 0.00 1.50 31.50 32.50 382.50 286.50 206.00 0.00 0.00 0.00 940.50
1999 0.00 0.00 0.50 3.46 d 23.50 79.00 326.50 327.00 26.50 1.50 2.50 0.00 790.46
2000 0.00 0.00 0.00 0.00 25.50 95.00 352.50 329.50 96.50 0.00 0.00 0.00 a 899.00
2001 0.00 0.00 0.00 5.00 50.00 f 144.83 a 405.67 b 416.95 a 98.04 b 6.41 b 0.00 b 0.00 f 1076.90
2002 0.00 0.00 0.00 1.00 41.50 154.50 452.00 192.00 95.00 0.00 0.00 0.00 936.00
2003 0.00 0.00 2.00 1.50 50.00 88.00 454.00 443.00 76.50 25.50 0.00 0.00 1140.50
2004 0.00 0.00 0.00 0.00 11.50 61.00 290.50 174.50 57.00 0.00 0.00 0.00 594.50
2005 0.00 0.00 0.00 0.00 10.00 110.00 346.50 211.00 70.00 5.50 0.00 0.00 753.00
2006 0.00 0.00 0.00 0.00 36.50 151.50 471.00 262.50 57.00 0.00 n 0.00 0.00 978.50
2007 0.00 0.00 0.00 7.50 24.50 120.00 478.00 257.00 83.50 0.00 0.00 0.00 970.50
2008 0.00 0.00 0.00 0.50 18.50 53.00 278.00 231.50 4.00 1.50 0.00 0.00 587.00
2009 0.00 0.00 0.00 5.50 33.50 76.00 219.50 185.00 86.50 0.00 0.00 a 0.00 606.00
2010 0.00 0.00 a 0.00 0.00 3.00 40.50 220.50 235.00 25.00 15.00 0.00 0.00 539.00
2011 0.00 f 0.00 e 0.00 b 0.00 c 0.00 a 53.57 b 340.48 a 296.57 a 82.50 b 33.38 e 0.00 0.00 806.51
2012 0.00 0.00 a 0.00 c 16.67 c 14.31 e 170.00 c 452.50 316.50 98.50 4.50 0.00 0.00 1072.97
2013 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
Period of Record Statistics
MEAN 0.00 0.03 0.44 3.85 24.49 109.81 300.36 267.24 75.64 9.06 0.20 0.00 801.94
S.D. 0.00 0.20 1.91 5.42 18.08 59.60 87.27 86.39 42.52 10.15 0.64 0.00 166.72
SKEW 0.00 7.14 5.69 1.38 0.62 1.42 -0.07 0.38 0.62 1.22 3.26 0.00 -0.08
MAX 0.00 1.50 13.00 20.00 71.00 368.00 478.00 469.00 206.00 34.74 3.00 0.00 1148.00
MIN 0.00 0.00 0.00 0.00 0.00 12.00 59.00 116.50 2.00 0.00 0.00 0.00 369.50
NO YRS 52 54 54 54 53 54 55 54 54 52 51 52 46