CHINOOK, MONTANA

Monthly Total Heating Degree Days

(241722)

Base Temperature = 65 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 16.50 12.00 141.00 568.00 978.00 1808.00 3523.50
1949 1913.50 1654.00 1193.00 428.00 211.00 80.00 15.50 33.50 261.00 118.50 x 644.50 1728.50 8162.50
1950 2421.00 1381.00 1327.50 746.50 409.20 a 162.00 43.29 b 47.00 343.50 539.50 1116.50 1356.50 9893.49
1951 1787.50 1464.50 1573.25 a 720.50 311.50 288.50 39.50 111.50 392.50 121.50 w 1075.56 c 1668.50 9433.31
1952 1823.50 1339.50 1423.00 382.50 224.50 129.50 35.50 36.00 151.00 546.50 1012.50 1368.50 8472.50
1953 1270.50 1031.00 955.50 781.00 393.50 135.50 20.00 15.00 154.50 417.50 803.50 1119.00 7096.50
1954 1912.50 785.00 1214.00 756.00 364.00 187.00 18.00 16.00 229.50 506.00 621.00 1050.50 7659.50
1955 1482.50 1367.50 1242.00 693.50 352.50 116.50 59.93 a 2.50 301.50 525.50 1492.50 1642.50 9278.93
1956 1666.50 1470.00 1024.50 713.00 308.00 46.50 28.50 57.00 190.50 516.50 908.50 1254.00 8183.50
1957 1876.00 1315.50 1005.00 644.50 205.00 69.50 2.50 38.00 203.50 706.50 905.00 976.00 7947.00
1958 1077.50 1338.50 1200.50 597.50 151.50 136.50 62.00 30.50 241.50 499.00 1006.50 1340.00 7681.50
1959 1677.50 1665.50 820.50 605.00 390.50 63.50 21.00 96.00 372.00 786.50 1236.00 1143.50 8877.50
1960 1701.38 a 1468.00 1227.50 640.50 334.50 113.00 6.50 70.00 246.00 504.50 1076.50 1436.00 8824.38
1961 1217.00 1081.50 856.50 733.50 286.00 7.00 3.00 4.50 356.00 563.50 1133.00 1634.50 7876.00
1962 1424.00 1291.50 1362.50 497.00 319.50 80.50 18.00 27.50 200.00 375.00 683.00 1087.50 7366.00
1963 1724.50 949.00 664.00 540.00 256.00 77.00 2.50 29.50 113.50 349.00 981.00 1489.55 a 7175.55
1964 1327.50 915.50 1093.00 570.00 271.50 115.00 4.00 82.50 362.00 515.50 1096.50 1998.50 8351.50
1965 1844.00 1350.00 1513.00 664.00 330.50 103.00 8.50 41.00 514.00 418.00 1167.50 1323.50 9277.00
1966 1967.50 1465.50 960.00 751.00 250.00 141.50 2.50 68.00 130.50 578.00 1250.00 1441.50 9006.00
1967 1536.00 1173.00 1268.50 883.89 c 371.50 131.79 b 7.50 4.00 117.50 511.50 1011.00 1430.28 b 8446.45
1968 1583.00 1206.00 784.00 659.00 388.00 148.00 33.00 100.48 b 0.00 z 595.41 b 964.66 a 1705.00 8166.55
1969 2267.00 1519.50 1318.00 442.00 281.00 174.00 25.50 13.00 173.00 809.00 864.00 1301.50 9187.50
1970 1713.50 1222.00 1231.00 746.00 294.00 44.00 6.00 21.00 314.00 676.50 1179.00 1693.00 9140.00
1971 1732.00 1215.00 1088.32 c 573.00 263.00 94.50 39.50 4.50 304.00 646.00 960.00 1754.00 8673.82
1972 1830.50 0.00 z 0.00 z 0.00 z 0.00 z 38.00 h 88.50 9.50 352.00 724.50 980.50 1651.00 5636.50
1973 1336.00 1171.50 810.00 717.00 280.00 108.46 d 14.00 21.00 262.50 519.00 1340.50 1429.50 8009.46
1974 1543.50 1006.00 1040.50 490.00 437.00 75.52 a 1.00 81.00 313.50 527.50 931.00 1186.50 7633.02
1975 1413.50 1494.50 1228.00 901.50 369.50 123.50 4.50 63.50 273.00 615.00 1064.50 1358.00 8909.00
1976 1409.50 957.50 1055.50 486.00 191.50 136.00 7.50 13.00 161.50 643.25 a 1073.50 1209.50 7344.25
1977 1750.00 655.50 i 893.26 d 0.00 z 238.18 a 46.15 d 18.17 b 110.50 215.00 f 0.00 z 0.00 z 1136.50 l 3056.27
1978 1916.12 b 1554.50 1209.55 c 613.33 c 230.00 f 55.38 d 14.31 e 81.00 j 150.50 i 0.00 z 0.00 z 495.50 w 5363.20
1979 1549.00 g 1288.50 f 1077.25 c 764.44 c 417.39 c 88.45 a 0.00 z 11.00 i 118.50 m 388.50 h 1097.07 a 0.00 z 3444.60
1980 0.00 z 0.00 z 337.00 s 291.50 g 245.62 e 87.93 a 0.00 z 120.42 e 241.11 c 574.02 a 732.50 f 1393.85 d 2662.95
1981 644.00 n 852.00 f 772.93 a 535.00 276.33 b 190.50 24.44 e 17.80 d 246.67 c 625.34 b 813.89 c 1487.00 4989.90
1982 2099.00 1452.50 1144.50 0.00 z 405.00 127.00 23.00 45.50 310.50 621.00 1248.50 1260.50 8737.00
1983 1264.50 984.50 918.50 662.50 381.00 99.00 k 30.50 10.00 379.00 582.50 242.50 x 2195.00 7408.00
1984 1330.00 897.50 1041.00 576.00 344.50 106.00 16.00 28.50 459.50 801.50 1095.00 1712.00 8407.50
1985 1538.50 1374.50 968.75 a 503.00 197.00 150.52 a 15.00 116.00 482.00 670.50 1701.21 a 1454.50 9171.47
1986 1081.50 1512.00 a 704.00 636.00 338.00 42.00 39.00 49.00 437.50 380.00 j 1216.07 b 1157.50 7212.57
1987 620.50 n 961.50 968.00 415.00 212.00 65.50 73.00 95.00 211.50 0.00 z 914.00 977.50 4893.00
1988 1577.50 1258.50 893.00 485.50 0.00 z 11.50 i 6.00 63.00 278.00 589.50 1074.00 1328.50 7553.50
1989 1328.00 1593.00 1171.80 a 663.50 341.00 112.50 1.00 81.00 338.00 656.50 976.50 1499.50 8762.30
1990 1232.50 1172.50 985.50 648.50 371.00 146.00 34.00 24.00 165.50 662.00 1022.50 1628.00 8092.00
1991 1685.37 a 839.50 997.00 583.50 327.00 76.00 1.50 2.50 215.00 731.50 1106.50 1188.00 7753.37
1992 1026.50 997.00 747.00 514.00 260.00 90.50 61.50 102.00 282.00 558.00 978.50 1590.00 7207.00
1993 1775.50 1461.50 872.50 559.50 212.50 141.50 112.00 81.50 303.00 609.00 1155.50 1170.00 8454.00
1994 1628.00 1614.00 802.50 544.50 200.50 76.50 12.00 31.50 132.00 604.50 1027.00 1280.50 7953.50
1995 1506.00 1045.50 1074.50 721.00 347.00 79.50 12.00 40.50 262.50 641.50 1075.00 1591.00 8396.00
1996 1906.00 1240.00 1260.50 560.50 399.50 55.00 7.00 19.50 285.00 654.50 1353.50 1679.00 9420.00
1997 1686.50 1019.50 992.00 706.00 276.50 31.00 24.00 0.00 z 151.50 642.50 1141.00 1260.50 7931.00
1998 1611.50 935.00 1130.00 522.50 239.50 174.00 3.50 17.50 142.00 621.00 946.50 1352.00 7695.00
1999 1437.37 a 943.19 a 862.00 634.50 378.50 138.50 80.60 a 30.48 a 338.00 604.00 813.00 1037.39 c 7297.53
2000 1414.50 1259.43 a 880.50 661.11 c 304.83 a 159.31 a 5.88 b 36.50 284.46 b 655.65 a 1213.97 a 1664.70 a 8540.84
2001 1329.00 1559.70 a 987.00 694.50 304.50 101.00 8.27 a 21.00 170.50 736.50 943.93 b 1413.60 a 8269.50
2002 1419.50 1117.50 1657.50 795.00 508.50 167.00 22.00 127.00 295.50 892.00 975.50 1253.50 9230.50
2003 1464.00 1354.50 1230.50 528.50 377.00 126.50 13.50 24.50 323.50 493.50 1262.50 1261.50 8460.00
2004 1667.00 1386.50 852.00 541.50 484.00 197.50 26.50 88.50 274.50 715.00 1004.00 1205.00 8442.00
2005 1706.00 1079.00 971.00 570.00 420.50 158.00 19.50 82.50 299.00 588.50 908.50 1466.50 8269.00
2006 1023.50 1182.50 1159.00 512.50 285.95 b 50.50 f 0.00 n 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4163.45
Period of Record Statistics
MEAN 1590.42 1247.04 1066.12 620.63 315.24 112.55 23.90 47.55 268.20 602.22 1048.52 1419.85 8336.47
S.D. 295.61 234.93 217.42 115.57 78.62 50.67 23.87 36.09 95.76 108.13 191.54 253.89 697.92
SKEW 0.28 -0.07 0.50 0.19 0.15 0.61 1.73 0.65 0.39 0.15 0.57 0.55 0.03
MAX 2421.00 1665.50 1657.50 901.50 508.50 288.50 112.00 127.00 514.00 892.00 1701.21 2195.00 9893.49
MIN 1023.50 785.00 664.00 382.50 151.50 7.00 1.00 2.50 113.50 349.00 621.00 976.00 7096.50
NO YRS 54 53 56 54 55 54 56 55 54 51 54 55 42