YELLOWTAIL DAM, MONTANA

Monthly Total Growing Degree Days

(249240)

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
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 32.50 u 283.50 292.50 o 299.50 u 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 302.00
Period of Record Statistics
MEAN 3.92 7.57 24.45 98.79 271.68 492.43 750.00 722.29 402.18 152.87 22.50 6.30 2988.08
S.D. 6.67 10.52 27.20 55.22 67.26 94.14 89.97 101.84 96.40 55.92 22.84 12.15 234.98
SKEW 1.91 2.39 1.50 0.72 0.05 0.38 -0.48 0.19 -0.25 0.17 1.51 3.47 -0.08
MAX 25.00 54.50 114.50 230.00 408.50 803.00 919.00 934.00 600.50 297.50 98.50 67.50 3566.00
MIN 0.00 0.00 0.00 14.50 134.50 266.50 492.00 559.00 109.00 38.50 0.00 0.00 2454.50
NO YRS 46 47 47 47 47 47 48 47 47 46 44 45 41