CHINOOK, MONTANA

Monthly Total Growing Degree Days

(241722)

Base Temperature = 40 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 881.50 901.00 630.50 223.50 6.50 0.00 2643.00
1949 0.00 0.00 4.00 323.50 574.00 709.50 877.50 930.50 496.50 56.50 x 137.50 16.50 4069.50
1950 0.00 0.00 3.00 95.00 373.03 a 623.50 831.12 b 766.50 430.50 243.00 40.50 0.00 3406.15
1951 0.00 0.00 3.10 a 150.00 464.50 475.00 885.00 731.00 372.00 78.50 w 7.78 c 17.50 3105.88
1952 0.00 0.00 7.50 391.00 551.50 656.00 852.00 840.50 609.50 252.00 19.00 0.00 4179.00
1953 2.50 0.50 48.00 97.50 395.00 647.00 929.50 882.00 610.50 362.00 61.00 4.00 4039.50
1954 4.00 39.00 10.00 110.50 455.50 585.00 980.50 871.50 527.50 280.50 179.00 26.50 4069.50
1955 0.00 0.00 37.50 128.50 422.50 669.00 871.10 a 949.00 469.00 260.00 21.50 0.00 3828.10
1956 0.00 0.00 68.00 116.50 489.50 812.50 913.00 817.50 564.50 283.00 47.50 41.00 4153.00
1957 0.00 0.00 33.00 163.00 574.00 718.00 998.00 882.00 563.00 194.00 28.00 18.50 4171.50
1958 5.50 11.50 19.50 180.50 674.50 638.00 805.00 900.00 530.00 285.50 49.50 6.50 4106.00
1959 0.50 0.00 62.00 188.50 384.50 750.00 906.00 728.50 384.00 109.00 17.00 12.50 3542.50
1960 0.00 a 0.00 72.00 162.00 457.00 677.50 1057.50 795.50 535.00 294.00 17.50 0.00 4068.00
1961 14.50 10.50 59.50 87.50 512.50 928.00 940.50 1040.00 413.50 268.50 19.50 0.00 4294.50
1962 21.50 27.50 21.50 277.50 455.50 743.00 839.00 882.00 555.00 400.00 153.50 35.00 4411.00
1963 23.00 41.50 151.00 238.00 538.00 762.00 1000.50 912.00 681.50 434.00 24.00 16.02 a 4821.52
1964 9.50 5.50 41.00 215.00 522.00 669.50 997.00 797.50 390.50 268.50 28.00 0.00 3944.00
1965 0.00 8.50 0.00 156.50 449.00 711.00 951.50 894.00 260.00 359.50 30.50 8.50 3829.00
1966 0.00 0.00 87.00 101.50 572.00 658.50 969.50 810.50 678.00 216.50 3.00 4.50 4101.00
1967 0.00 0.00 9.00 60.00 c 431.00 640.18 b 971.50 947.00 687.00 267.50 30.00 5.88 b 4049.06
1968 33.50 11.50 87.50 154.00 390.50 630.00 891.00 699.10 b 0.00 z 184.40 b 20.17 a 0.00 3101.67
1969 0.00 0.00 7.00 313.50 512.00 620.50 855.00 956.00 605.00 86.50 39.00 0.00 3994.50
1970 0.00 0.00 1.00 85.50 481.00 839.00 957.00 910.00 458.50 168.00 8.50 0.00 3908.50
1971 0.00 0.00 12.73 c 191.00 527.00 701.00 862.00 1053.00 452.00 229.00 23.00 0.00 4050.73
1972 0.00 0.00 z 0.00 z 0.00 z 0.00 z 568.00 h 757.00 960.50 420.50 156.00 15.00 5.50 2314.50
1973 29.50 3.50 50.50 100.50 513.00 713.65 d 910.00 928.00 502.00 261.00 7.50 0.00 4019.15
1974 10.50 0.00 29.00 273.00 341.00 785.17 a 964.50 743.50 447.00 261.00 38.00 7.00 3899.67
1975 0.00 2.00 11.50 65.00 407.00 644.00 999.00 758.50 477.00 199.00 95.50 6.50 3665.00
1976 7.00 17.50 52.00 272.50 594.00 645.50 944.00 927.50 638.50 225.78 a 36.50 17.50 4378.28
1977 0.00 1.50 i 49.94 d 0.00 z 548.70 a 825.58 d 901.67 b 711.00 392.00 f 0.00 z 0.00 z 0.00 l 3036.89
1978 0.00 b 0.00 29.89 c 146.11 c 397.00 f 741.92 d 905.56 e 468.00 j 407.50 i 0.00 z 0.00 z 0.00 w 1823.48
1979 0.00 g 0.00 f 21.59 c 86.67 c 368.68 c 723.62 a 0.00 z 627.00 i 313.00 m 218.00 h 9.31 a 0.00 z 1209.87
1980 0.00 z 0.00 z 4.50 s 294.00 g 557.40 e 713.28 a 0.00 z 676.04 e 512.22 c 253.17 a 39.50 f 53.39 d 2765.50
1981 0.50 n 35.00 f 62.00 a 230.00 505.62 b 572.00 881.71 e 917.94 d 513.89 c 184.93 b 62.78 c 0.00 3930.87
1982 0.00 11.00 13.00 0.00 z 373.50 658.00 849.00 824.50 457.00 188.00 0.00 0.00 3374.00
1983 1.50 14.00 30.00 163.00 413.50 390.00 k 893.50 982.00 399.00 204.00 13.00 x 0.00 3100.50
1984 10.50 14.50 13.00 208.50 444.50 704.50 936.00 946.50 342.00 201.00 2.50 15.50 3839.00
1985 0.00 0.50 15.50 a 261.00 606.50 643.97 a 954.50 700.50 294.50 167.50 4.66 a 0.00 3649.12
1986 11.00 16.59 a 118.50 204.00 480.00 805.50 802.50 796.50 312.50 154.00 j 19.29 b 0.00 3566.38
1987 0.00 n 6.50 57.00 343.00 575.00 746.50 817.00 724.00 548.50 0.00 z 26.00 4.00 3847.50
1988 0.00 14.00 50.50 266.50 0.00 z 688.50 i 911.50 792.50 484.00 250.00 40.50 13.00 2822.50
1989 17.00 0.00 13.43 a 122.50 440.00 691.00 977.50 758.00 416.50 167.50 35.00 7.00 3645.43
1990 3.50 10.50 17.50 188.00 406.00 684.00 846.00 905.00 601.50 164.50 25.50 8.50 3860.50
1991 1.55 a 25.00 29.00 175.50 464.50 686.50 951.50 995.50 553.00 257.50 17.00 2.50 4159.05
1992 37.50 36.50 71.00 282.50 525.00 763.50 746.50 787.00 470.00 266.50 4.50 0.00 3990.50
1993 0.00 0.00 75.00 191.00 574.50 647.00 696.00 756.00 451.50 189.50 13.50 3.50 3597.50
1994 0.00 0.00 64.00 231.50 585.50 744.50 950.00 938.00 633.50 191.50 0.00 6.00 4344.50
1995 5.00 55.50 64.50 85.00 435.50 744.50 882.50 841.00 513.50 179.00 8.50 0.00 3814.50
1996 4.50 3.50 8.50 222.50 379.50 776.50 918.00 932.00 471.50 206.00 4.00 0.00 3926.50
1997 4.00 2.00 73.50 165.00 517.50 793.50 902.50 0.00 z 622.00 198.00 5.00 0.00 3283.00
1998 0.00 4.50 19.00 229.50 541.50 599.50 999.50 962.00 692.00 175.00 34.00 18.00 4274.50
1999 2.07 a 5.19 a 62.00 185.00 415.00 637.50 811.17 a 868.00 a 412.50 199.50 87.00 6.09 c 3691.01
2000 0.00 5.18 a 48.50 162.78 c 480.50 a 620.69 a 971.16 b 899.50 489.64 b 183.42 a 0.00 a 5.17 a 3866.53
2001 4.50 0.00 a 22.00 163.50 481.50 695.00 948.60 a 939.00 611.00 106.00 40.18 b 5.68 a 4016.96
2002 24.50 1.00 0.00 89.00 302.00 644.00 933.00 675.00 473.50 78.50 25.50 3.00 3249.00
2003 3.50 1.50 39.50 272.50 428.00 672.50 1003.50 1024.00 466.00 323.00 8.00 1.50 4243.50
2004 0.50 0.00 80.00 221.50 312.00 574.50 874.50 731.50 489.00 131.00 26.50 3.50 3444.50
2005 28.50 8.50 37.50 209.50 385.00 627.00 898.50 812.50 463.00 215.50 41.00 5.50 3732.00
2006 6.50 0.00 10.50 244.00 530.21 b 583.50 f 563.00 n 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 791.21
Period of Record Statistics
MEAN 6.07 7.83 39.00 186.06 475.24 692.38 906.43 856.55 501.51 224.55 32.30 7.48 3958.90
S.D. 9.72 12.33 31.72 76.14 80.67 78.23 71.31 98.75 101.50 72.61 36.73 10.89 300.92
SKEW 1.80 2.10 1.06 0.41 0.01 0.29 -0.58 -0.10 -0.06 0.56 2.39 2.31 0.09
MAX 37.50 55.50 151.00 391.00 674.50 928.00 1057.50 1053.00 692.00 434.00 179.00 53.39 4821.52
MIN 0.00 0.00 0.00 60.00 302.00 475.00 696.00 675.00 260.00 78.50 0.00 0.00 3249.00
NO YRS 54 53 56 54 55 54 56 55 54 51 54 55 42