SULA 3 ENE, MONTANA

Monthly Total Heating Degree Days

(247964)

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
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 1403.27 a 1403.27
1956 1355.00 1308.50 1089.50 673.00 439.00 239.50 85.00 177.00 300.50 737.50 1101.00 1230.00 8735.50
1957 1729.00 1137.00 971.00 728.00 420.00 287.00 134.50 179.50 387.00 750.50 1140.00 1289.00 9152.50
1958 1399.65 a 903.50 1056.50 781.50 354.00 279.50 179.50 93.00 412.50 680.50 1035.00 1088.50 8263.65
1959 1197.00 1162.00 1005.00 692.50 627.00 241.50 150.00 229.50 435.50 712.00 1126.00 1241.00 8819.00
1960 1510.50 1264.00 1069.00 743.00 547.00 266.50 46.00 240.50 387.00 707.83 a 1042.00 1334.00 9157.33
1961 1192.00 865.50 935.00 760.50 501.50 159.00 61.50 74.50 560.00 743.00 1100.00 1336.50 8289.00
1962 1562.50 1133.00 1093.00 660.50 520.00 305.50 175.87 e 194.00 402.50 678.00 959.50 1174.00 8858.37
1963 1620.27 a 849.50 950.00 772.50 470.50 330.00 a 185.50 178.00 290.50 565.50 946.50 1327.50 8486.27
1964 1385.00 1255.50 1186.00 777.50 546.50 338.00 90.00 216.00 446.50 672.00 1044.00 1295.00 9252.00
1965 1228.00 1050.50 1237.00 688.50 626.00 331.00 131.00 208.50 619.00 671.50 947.00 1333.00 9071.00
1966 1294.00 1170.50 1088.00 771.00 486.50 374.46 b 126.50 230.00 353.50 725.00 941.00 1183.50 8743.96
1967 0.00 z 0.00 z 0.00 z 115.00 z 548.50 317.50 143.00 110.50 280.00 691.50 979.50 1413.00 4483.50
1968 1350.00 963.50 867.50 856.00 596.00 310.50 163.78 a 234.50 422.00 737.50 609.50 k 1325.50 7826.78
1969 1423.00 1195.50 1154.50 632.50 471.00 330.50 192.50 159.00 368.00 847.50 946.00 1189.00 8909.00
1970 1260.00 878.50 1086.00 830.50 513.00 237.50 103.50 108.00 476.00 782.50 961.00 1334.00 8570.50
1971 1294.50 1048.50 1037.00 709.50 482.50 333.50 189.00 66.43 c 507.50 770.00 978.00 1421.50 8837.93
1972 1420.50 1083.50 822.00 767.50 501.00 244.00 202.00 100.50 523.89 c 752.50 1039.50 1516.00 8972.89
1973 1388.00 1122.00 909.00 792.50 502.00 302.50 142.00 157.50 424.50 682.00 1153.50 1148.50 8724.00
1974 1439.00 1011.00 978.57 a 685.38 d 0.00 z 220.50 139.50 193.00 392.00 676.50 887.00 1261.59 c 7884.04
1975 0.00 z 1208.50 1049.00 862.00 564.50 355.18 b 41.33 a 219.50 401.38 a 711.50 1104.50 1223.00 7740.39
1976 1272.50 1085.95 a 1082.00 656.38 a 425.50 340.50 106.00 192.50 353.33 c 670.93 c 947.50 1222.95 a 8356.04
1977 1560.50 968.59 a 1033.50 625.50 575.00 195.52 a 149.50 152.50 i 409.66 a 679.00 1075.50 1215.50 8487.77
1978 1226.50 989.00 836.00 681.00 599.69 b 292.50 b 134.00 186.50 355.50 650.50 1190.50 1615.00 8756.69
1979 1857.50 1031.85 a 952.00 712.50 505.00 290.50 131.75 a 136.00 309.00 530.50 g 1165.50 1070.50 8162.10
1980 1510.50 1004.00 1012.15 a 607.76 a 470.88 b 313.00 147.50 261.50 356.00 717.50 945.52 a 1077.50 8423.80
1981 1124.00 965.00 865.00 653.50 512.50 336.00 0.00 z 77.00 341.50 743.50 934.00 1260.50 7812.50
1982 1415.50 1182.00 930.00 855.50 597.00 290.00 163.50 104.50 395.50 710.50 1076.50 1301.50 9022.00
1983 1071.00 895.00 879.50 792.50 548.50 290.50 182.50 65.50 462.50 651.00 951.50 1736.00 8526.00
1984 1352.00 1070.00 939.00 765.00 549.00 356.00 135.00 106.50 512.00 826.00 973.00 1458.50 9042.00
1985 1589.55 b 1318.00 1145.50 663.00 441.20 c 292.50 34.00 219.50 480.50 751.50 1347.93 a 1578.50 9861.68
1986 1141.50 987.50 765.70 a 727.50 450.50 153.00 228.00 93.00 503.00 679.00 1007.07 a 1278.00 8013.77
1987 1337.50 926.50 897.50 565.50 403.50 226.00 178.50 263.50 372.50 687.00 957.50 1297.00 8112.50
1988 1429.50 1101.00 960.50 600.00 492.00 157.50 121.50 200.50 417.00 534.00 1009.50 1347.00 8370.00
1989 1257.50 1351.00 972.00 662.50 529.00 260.00 57.00 203.00 409.00 672.00 898.00 1310.00 8581.00
1990 1128.00 1068.00 917.00 604.00 544.00 298.00 112.50 140.50 238.00 702.50 903.50 1534.00 8190.00
1991 1374.50 793.50 962.00 740.50 550.50 331.00 94.00 61.00 296.50 724.00 1034.00 1274.00 8235.50
1992 1218.50 865.00 731.00 607.00 369.00 185.00 184.00 171.50 410.00 625.00 1115.00 1479.00 7960.00
1993 1617.50 1338.50 885.00 723.00 384.50 359.50 327.00 269.00 437.00 700.00 1177.00 1223.50 9441.50
1994 1120.00 1195.50 890.50 663.50 455.00 305.50 136.50 134.00 336.50 753.50 1131.00 1258.50 8380.00
1995 1251.50 925.00 976.50 769.50 559.50 345.50 160.00 201.50 388.00 764.50 911.50 1294.50 8547.50
1996 1406.00 1209.50 992.50 706.50 622.00 309.00 112.00 188.50 451.00 757.50 1004.50 1314.50 9073.50
1997 1402.50 1171.00 967.00 836.50 446.50 282.00 186.00 161.00 321.50 739.00 1006.50 1496.00 9015.50
1998 1276.00 1036.50 950.50 691.50 478.00 371.50 60.50 122.50 235.00 761.00 935.00 1345.50 8263.50
1999 1182.50 1074.50 976.00 782.50 592.50 345.50 229.00 76.50 435.50 639.00 779.00 1272.00 8384.50
2000 1339.00 959.50 886.00 615.00 484.50 264.50 107.00 172.10 b 402.50 680.50 1225.00 1314.00 8449.60
2001 1299.00 1179.00 874.50 756.50 441.00 319.50 95.00 65.00 257.50 652.00 823.50 1420.32 a 8182.82
2002 1277.50 1070.50 1143.00 731.50 539.00 239.00 62.00 233.50 338.50 871.00 1033.50 1231.50 8770.50
2003 1091.00 1102.50 902.00 707.50 522.00 264.50 51.50 52.00 342.00 602.50 1186.00 1231.50 8055.00
2004 1302.50 1091.00 784.50 648.50 526.50 268.00 0.00 z 155.00 433.50 694.00 981.50 1116.50 8001.50
2005 1336.00 964.00 879.50 682.00 507.88 a 331.50 62.50 167.92 a 387.50 594.50 1112.50 1403.00 8428.80
2006 1063.50 1150.50 939.00 659.50 462.00 199.66 a 15.00 l 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4474.16
Period of Record Statistics
MEAN 1344.47 1073.60 970.21 713.55 506.00 286.59 133.96 160.21 395.55 704.65 1025.91 1314.59 8649.68
S.D. 169.89 136.35 108.89 73.29 65.81 56.56 57.72 61.24 79.66 64.36 109.74 135.80 417.38
SKEW 0.69 0.09 0.24 0.17 -0.18 -0.71 0.56 -0.14 0.27 -0.02 0.43 0.75 0.55
MAX 1857.50 1351.00 1237.00 862.00 627.00 374.46 327.00 269.00 619.00 871.00 1347.93 1736.00 9861.68
MIN 1063.50 793.50 731.00 565.50 354.00 153.00 34.00 52.00 235.00 534.00 779.00 1070.50 7960.00
NO YRS 49 50 50 50 50 51 48 49 50 49 49 51 42