YELLOWTAIL DAM, MONTANA

Monthly Total Growing Degree Days

(249240)

Base Temperature = 40 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 977.00 1046.50 766.00 382.00 50.00 6.50 3228.00
1949 6.50 15.00 37.50 459.50 614.50 763.50 1049.50 1087.07 a 610.00 235.00 310.50 14.00 5202.57
1950 3.50 55.00 44.50 204.83 a 380.50 654.00 880.50 904.50 604.00 0.00 z 0.00 z 0.00 z 3731.33
1951 0.00 z 33.50 i 21.50 j 197.50 560.50 535.00 974.00 924.50 495.00 b 304.00 0.00 z 0.00 z 3990.50
1952 26.50 56.00 39.00 380.00 555.50 845.50 983.00 740.00 i 0.00 z 0.00 z 0.00 z 0.00 z 2885.50
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 49.00 49.00
1963 17.05 a 118.50 198.50 231.50 580.50 754.00 1065.00 1052.00 866.38 a 563.00 149.50 67.50 5663.43
1964 34.50 28.50 62.50 245.00 583.50 743.50 1155.50 908.00 550.00 424.50 73.50 0.50 4809.50
1965 39.50 73.00 9.50 284.50 477.00 716.50 1050.00 955.00 313.50 517.50 116.00 68.00 4620.00
1966 27.50 0.00 168.00 213.50 664.00 754.50 1169.00 952.00 790.00 376.00 79.50 74.00 5268.00
1967 53.00 60.00 107.00 190.50 465.50 610.00 1025.50 1038.00 768.50 446.00 94.50 30.50 4889.00
1968 54.00 69.00 195.00 265.50 451.50 714.50 1019.00 924.00 687.00 400.00 68.50 g 16.50 4796.00
1969 8.00 0.00 78.00 395.50 600.00 661.00 993.00 1154.50 770.50 164.50 102.00 17.00 4944.00
1970 3.00 20.50 26.50 127.00 591.50 846.50 1106.00 1162.00 611.00 302.00 80.50 32.50 4909.00
1971 40.50 53.00 106.50 240.50 551.50 812.00 988.50 1199.50 584.00 363.50 103.00 8.50 5051.00
1972 21.50 69.00 277.50 269.50 565.00 894.50 928.00 1049.00 588.00 316.50 49.50 87.50 5115.50
1973 92.50 38.00 63.50 203.28 a 538.00 841.00 1055.00 1106.00 629.00 491.50 84.50 92.50 5234.78
1974 94.50 102.50 157.50 370.00 450.50 861.50 1128.00 874.00 624.00 459.50 121.00 24.00 5267.00
1975 20.50 1.00 28.00 113.50 429.00 681.50 1092.00 920.00 686.50 409.00 180.50 109.50 4671.00
1976 36.00 g 96.84 a 133.00 316.50 611.50 741.50 1111.00 1019.50 765.00 340.00 173.00 85.00 5392.84
1977 6.00 89.50 110.00 402.00 618.00 922.50 1085.50 903.00 666.00 426.50 97.50 42.00 5368.50
1978 4.50 11.50 194.00 322.50 495.50 797.50 992.00 971.00 762.50 464.48 a 83.89 c 1.50 5100.87
1979 0.00 c 11.00 113.84 b 247.00 541.00 827.00 1050.38 a 1050.50 865.00 515.50 59.00 134.50 5414.73
1980 33.00 56.00 61.00 438.50 647.00 807.50 1120.00 934.50 746.00 401.93 b 195.00 192.50 5632.93
1981 50.00 130.50 143.38 c 441.00 554.90 a 728.50 1035.00 1043.50 832.00 352.00 245.50 71.50 5627.77
1982 18.50 155.50 101.00 278.00 477.50 697.50 1004.50 1105.50 636.50 378.00 54.50 46.00 4953.00
1983 70.00 120.50 166.50 232.00 491.50 783.50 1114.50 1244.00 686.50 433.50 158.00 1.50 5502.00
1984 120.00 68.50 99.50 272.00 564.50 807.50 1125.50 1177.48 a 583.00 333.00 105.54 b 14.97 b 5271.48
1985 5.17 a 37.50 83.50 465.00 706.00 801.00 1171.00 963.00 581.00 423.50 62.50 40.09 b 5339.25
1986 129.00 74.00 327.50 302.50 544.00 943.00 978.50 1046.50 542.00 449.50 112.50 15.00 5464.00
1987 62.00 87.50 164.00 495.50 693.00 885.50 975.00 869.00 684.00 405.50 147.50 87.00 5555.50
1988 40.50 96.50 157.50 404.00 674.50 1103.00 1163.50 1039.50 651.50 512.50 142.00 69.00 6054.00
1989 72.85 a 10.50 106.50 298.50 590.50 801.50 1153.00 1013.00 699.50 372.50 162.50 52.50 5333.35
1990 75.00 90.50 147.00 327.00 503.00 789.50 1047.50 1081.00 893.50 384.50 197.00 61.00 5596.50
1991 43.50 104.50 92.00 244.00 554.00 858.00 1105.00 1161.50 730.00 424.50 89.50 41.50 5448.00
1992 102.00 114.50 257.50 392.50 676.50 850.50 884.50 891.00 709.50 444.50 85.00 7.50 5415.50
1993 24.00 4.00 217.50 306.50 665.50 755.00 802.00 896.00 630.00 382.00 68.00 77.50 4828.00
1994 39.50 36.00 224.50 347.00 718.50 900.50 1071.50 1122.50 783.00 316.50 48.50 57.00 5665.00
1995 60.50 137.50 198.92 a 188.50 412.50 775.00 1004.50 1103.00 691.50 398.50 180.50 61.50 5212.42
1996 44.00 145.00 67.50 363.00 427.00 922.50 1085.00 1125.50 679.00 421.50 14.50 19.50 5314.00
1997 35.50 47.50 210.50 244.50 613.50 867.50 966.50 986.50 811.50 424.00 113.00 42.00 5362.50
1998 46.00 41.00 93.00 270.00 635.00 643.00 1157.50 1061.50 900.50 308.00 131.00 79.00 5365.50
1999 43.00 109.50 176.50 249.23 d 547.50 761.00 1095.00 1102.00 620.50 455.50 297.50 93.00 5550.23
2000 5.50 46.00 129.00 330.00 612.00 794.50 1127.50 1098.00 705.00 301.50 9.00 14.47 a 5172.47
2001 32.00 7.00 81.50 289.00 533.50 f 814.14 a 1180.67 b 1191.95 a 786.43 b 332.98 b 199.29 b 14.50 f 4914.96
2002 30.00 68.00 29.50 201.50 484.00 856.00 1227.00 959.50 730.50 231.50 180.50 40.00 5038.00
2003 55.50 19.50 138.50 390.50 544.00 765.50 1229.00 1211.00 688.00 524.00 73.50 28.50 5667.50
2004 9.00 27.50 222.00 361.50 523.00 726.50 1063.00 939.50 691.00 334.50 121.00 70.50 5089.00
2005 55.00 50.50 135.50 269.00 480.00 753.00 1114.00 943.50 676.00 333.50 144.00 61.50 5015.50
2006 72.50 28.00 71.00 349.50 570.50 887.00 1246.00 1037.50 656.50 86.50 n 136.00 37.00 5091.50
2007 24.00 24.00 242.00 263.00 591.00 832.00 1253.00 1020.50 686.00 357.50 147.00 24.00 5464.00
2008 19.50 5.00 49.00 181.50 462.50 676.00 1047.00 984.00 422.50 303.50 136.50 27.50 4314.50
2009 56.00 25.50 84.00 218.50 542.50 665.00 985.00 945.00 733.50 175.50 97.24 a 2.50 4530.24
2010 8.00 3.63 a 128.00 233.50 366.50 704.00 980.50 990.50 605.50 466.50 122.00 9.00 4617.63
2011 26.50 f 61.48 e 72.69 b 143.33 c 344.62 a 694.82 b 1115.48 a 1071.57 a 720.00 b 450.10 e 114.00 31.00 4819.09
2012 68.50 4.14 a 270.14 c 298.33 c 453.67 e 879.44 c 1227.50 1080.50 784.50 334.50 129.00 37.00 5567.24
2013 29.00 9.50 74.00 5.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 112.50
Period of Record Statistics
MEAN 40.99 55.83 129.11 292.00 547.08 787.16 1067.86 1030.37 684.78 385.92 122.10 47.57 5228.17
S.D. 30.58 42.90 73.57 88.92 88.22 96.55 95.50 96.60 110.31 84.51 61.60 37.47 355.47
SKEW 0.90 0.52 0.58 0.29 -0.19 0.24 -0.22 0.23 -0.63 -0.41 0.93 1.32 -0.41
MAX 129.00 155.50 327.50 495.50 718.50 1103.00 1253.00 1244.00 900.50 563.00 310.50 192.50 6054.00
MIN 0.00 0.00 9.50 113.50 344.62 535.00 802.00 869.00 313.50 164.50 9.00 0.50 4314.50
NO YRS 52 54 54 54 53 54 55 54 54 52 51 52 46