YELLOWTAIL DAM, MONTANA

Monthly Total Growing Degree Days

(249240)

Base Temperature = 50 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 667.00 736.50 467.00 148.00 0.00 0.00 2018.50
1949 0.00 0.00 0.00 198.00 330.50 463.50 739.50 777.07 a 323.00 65.50 68.50 0.00 2965.57
1950 0.00 9.50 6.00 52.24 a 156.50 359.00 570.50 594.50 347.50 0.00 z 0.00 z 0.00 z 2095.74
1951 0.00 z 6.00 i 0.00 j 54.50 267.50 266.50 666.00 614.50 238.93 b 123.50 0.00 z 0.00 z 2231.43
1952 0.00 1.50 1.00 162.50 255.50 545.50 673.00 520.00 i 0.00 z 0.00 z 0.00 z 0.00 z 1639.00
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 24.00 67.50 62.00 276.00 454.00 755.00 742.00 566.38 a 297.50 20.50 1.00 3265.88
1964 0.00 0.00 6.50 61.00 280.00 443.50 845.50 598.00 254.50 160.00 1.00 0.00 2650.00
1965 1.00 14.50 0.00 76.00 202.00 416.50 740.00 645.00 109.00 222.50 16.50 11.50 2454.50
1966 3.00 0.00 34.00 40.00 372.50 454.50 859.00 642.00 490.50 126.50 5.50 7.00 3034.50
1967 4.00 4.00 22.50 21.50 235.00 316.00 715.50 728.00 468.50 170.00 10.50 1.00 2696.50
1968 7.50 3.50 31.50 95.50 170.50 414.50 709.00 614.00 390.00 140.50 12.50 g 2.00 2578.50
1969 0.00 0.00 7.00 141.00 300.50 366.50 683.00 844.50 470.50 38.50 16.00 0.00 2867.50
1970 0.00 2.00 3.50 35.00 297.00 548.00 796.00 852.00 351.50 107.50 4.50 5.50 3002.50
1971 2.50 6.00 17.00 52.00 252.50 512.00 678.50 889.50 314.50 167.50 23.50 0.00 2915.50
1972 0.00 18.50 105.50 50.50 282.00 594.50 618.00 739.00 321.00 100.00 0.00 9.50 2838.50
1973 24.00 2.00 0.00 36.72 a 244.00 541.00 745.00 796.00 348.00 216.50 19.00 8.50 2980.72
1974 25.00 10.00 35.50 128.00 176.50 561.50 818.00 564.00 335.50 189.50 16.00 0.00 2859.50
1975 0.00 0.00 0.00 14.50 169.50 381.50 782.00 610.00 386.50 179.00 73.00 32.50 2628.50
1976 0.00 g 8.80 a 26.00 75.00 301.50 442.50 801.00 709.50 465.00 149.00 44.00 11.50 3033.80
1977 0.00 7.00 20.50 169.00 315.00 622.50 775.50 593.00 366.00 156.50 3.50 1.00 3029.50
1978 0.00 0.00 66.50 65.00 217.00 497.50 682.00 661.00 473.00 180.83 a 25.00 c 0.00 2867.83
1979 0.00 c 0.00 12.29 b 57.00 265.00 530.50 740.38 a 740.50 565.00 254.00 8.00 36.50 3209.18
1980 0.00 11.50 0.00 211.50 337.50 507.50 810.00 624.50 446.00 179.59 b 67.00 67.50 3262.59
1981 0.00 20.00 3.32 c 185.50 261.95 a 428.50 725.00 733.50 532.00 124.00 65.50 16.50 3095.77
1982 0.00 54.50 5.50 99.50 200.00 397.50 694.50 795.50 371.00 115.50 0.00 4.00 2737.50
1983 12.50 14.50 36.50 80.50 225.00 483.50 804.50 934.00 428.50 142.00 35.00 0.00 3196.50
1984 21.50 0.50 0.00 65.00 287.00 507.50 815.50 867.48 a 340.00 160.00 9.64 b 0.00 b 3074.13
1985 0.00 a 1.00 4.00 230.00 396.50 501.00 861.00 653.00 321.00 159.00 17.00 0.00 b 3143.50
1986 11.50 13.50 114.50 98.00 271.00 643.00 668.50 736.50 244.00 171.00 15.00 0.00 2986.50
1987 1.00 6.50 47.50 222.50 393.50 585.50 665.00 559.00 384.00 169.00 21.00 8.50 3063.00
1988 6.00 6.00 18.00 150.50 372.50 803.00 853.50 729.50 354.50 227.00 43.00 2.50 3566.00
1989 10.85 a 0.00 7.00 107.00 281.50 501.50 843.00 703.00 410.50 148.00 23.00 6.50 3041.85
1990 8.00 11.50 16.00 112.00 216.00 489.50 737.50 771.00 593.50 144.00 52.00 14.00 3165.00
1991 0.00 4.00 6.00 88.00 281.00 558.00 795.00 851.50 433.50 224.50 8.00 0.00 3249.50
1992 17.00 7.00 38.00 161.50 370.50 550.50 574.50 588.00 409.50 206.50 7.50 0.00 2930.50
1993 0.00 0.00 56.50 72.00 355.50 455.00 492.00 586.00 337.00 143.50 4.00 5.50 2507.00
1994 0.00 0.00 51.00 145.00 408.50 600.50 761.50 812.50 483.00 78.00 2.50 2.00 3344.50
1995 8.00 28.00 44.95 a 31.50 134.50 486.00 694.50 793.00 419.50 149.50 32.00 8.50 2829.95
1996 1.00 31.50 6.50 130.50 155.00 622.50 775.00 815.50 390.00 202.00 0.00 0.00 3129.50
1997 0.00 3.50 66.50 61.50 307.50 567.50 656.50 676.50 511.50 167.00 13.50 1.00 3032.50
1998 4.00 0.00 12.50 62.00 330.00 351.50 847.50 751.50 600.50 69.00 25.00 6.50 3060.00
1999 0.00 14.50 40.00 77.31 d 261.00 461.00 785.00 792.00 326.00 183.00 98.50 6.00 3044.31
2000 0.00 0.00 6.00 105.00 314.50 494.50 817.50 788.00 434.50 65.50 0.00 0.00 a 3025.50
2001 0.50 0.00 1.50 116.50 288.00 f 515.69 a 870.67 b 881.95 a 486.43 b 86.05 b 27.32 b 0.00 f 2986.61
2002 0.00 6.50 0.00 50.00 233.50 556.00 917.00 649.50 433.00 55.00 21.00 0.00 2921.50
2003 0.00 0.00 29.50 146.50 272.00 465.50 919.00 901.00 389.50 255.50 12.00 0.00 3390.50
2004 0.00 0.00 47.00 117.00 238.00 427.50 753.00 629.50 391.50 103.50 17.00 1.00 2725.00
2005 8.50 5.50 17.00 70.00 215.00 453.00 804.00 633.50 380.00 111.50 18.50 6.00 2722.50
2006 3.00 4.50 11.00 107.50 285.50 587.00 936.00 727.50 368.50 20.00 n 19.50 0.00 3050.00
2007 0.00 0.00 63.50 91.00 298.50 532.00 943.00 710.50 392.50 105.00 31.50 4.50 3172.00
2008 0.00 0.00 0.50 57.50 195.50 376.00 737.00 674.00 157.00 96.00 20.00 0.00 2313.50
2009 0.50 0.00 4.50 72.50 260.50 384.50 675.00 635.00 435.00 35.50 10.34 a 0.00 2513.34
2010 0.00 0.00 a 17.00 66.00 136.50 404.00 670.50 680.50 316.50 195.00 34.50 0.00 2520.50
2011 0.50 f 7.30 e 1.60 b 12.78 c 83.70 a 394.82 b 805.48 a 761.57 a 422.68 b 184.21 e 26.00 3.00 2703.15
2012 10.50 0.00 a 62.00 c 102.22 c 177.65 e 579.44 c 917.50 770.50 484.50 123.00 19.50 2.50 3249.32
2013 1.00 0.00 8.00 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 9.00
Period of Record Statistics
MEAN 3.70 6.72 24.19 95.42 262.70 488.93 757.90 720.50 397.76 149.44 22.57 5.64 2962.61
S.D. 6.43 10.09 27.05 53.32 72.45 93.94 95.46 96.41 97.46 56.54 21.38 11.43 265.83
SKEW 1.98 2.55 1.42 0.79 -0.12 0.38 -0.22 0.23 -0.38 0.13 1.57 3.75 -0.35
MAX 25.00 54.50 114.50 230.00 408.50 803.00 943.00 934.00 600.50 297.50 98.50 67.50 3566.00
MIN 0.00 0.00 0.00 12.78 83.70 266.50 492.00 559.00 109.00 35.50 0.00 0.00 2313.50
NO YRS 52 54 54 54 53 54 55 54 54 52 51 52 46