CIRCLE, MONTANA

Monthly Total Heating Degree Days

(241758)

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
1963 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2.50 y 339.50 877.50 1461.50 2678.50
1964 1259.50 1055.00 1156.00 568.50 276.00 105.50 2.50 92.50 311.50 505.50 1180.00 1772.50 8285.00
1965 1625.50 1360.00 1562.50 648.50 379.00 99.50 7.50 65.00 536.00 427.50 978.50 1184.00 8873.50
1966 1811.50 1360.00 883.50 759.50 243.00 j 122.50 0.00 65.50 133.00 546.00 1156.50 1372.78 a 8210.78
1967 1373.50 1170.50 1130.50 775.50 430.00 116.50 29.00 13.50 136.50 543.50 987.50 1487.48 a 8193.98
1968 1547.42 a 1258.39 a 853.02 a 729.31 a 415.40 a 161.79 b 49.27 c 67.96 e 219.50 410.00 i 987.00 1652.82 a 7941.87
1969 2142.88 c 1434.50 1310.86 c 456.00 352.22 b 227.00 27.90 a 19.12 a 163.00 806.00 a 929.50 1299.00 9167.97
1970 1721.00 1199.52 c 1279.55 b 811.50 382.00 52.50 19.00 10.16 b 319.50 714.55 a 1138.00 1513.00 9160.28
1971 1815.50 1332.00 1116.50 646.00 301.00 62.22 c 49.50 9.50 289.00 680.50 1000.56 c 1616.00 8918.28
1972 1814.50 1545.00 1081.90 a 638.50 347.20 a 50.50 101.78 a 19.00 360.00 731.50 1011.50 1687.84 c 9389.22
1973 1408.50 1100.00 833.00 709.00 348.50 94.00 24.00 11.00 310.50 410.50 f 1229.50 1408.00 7476.00
1974 1618.00 1085.50 1149.00 591.96 b 464.50 84.31 a 5.50 109.00 334.66 a 546.63 a 986.00 1239.00 8214.06
1975 1402.00 1446.15 a 1243.00 848.00 385.00 122.00 6.00 78.50 320.00 640.50 1038.00 1340.00 8869.15
1976 1494.50 1031.92 e 1155.78 a 535.50 248.50 122.00 12.00 23.50 219.00 741.00 1153.00 1355.73 a 8092.43
1977 1901.00 1056.50 969.50 530.17 a 199.36 b 39.00 25.83 a 137.00 274.00 601.00 1170.00 1621.00 8524.37
1978 1991.50 1573.83 d 1119.50 611.00 306.00 122.00 38.50 65.21 b 245.00 609.00 1287.50 1673.00 9642.04
1979 2065.50 1630.00 1203.00 852.00 457.00 118.00 20.00 43.50 136.00 496.50 1102.00 1156.30 a 9279.80
1980 1614.00 1228.00 1100.50 444.50 205.50 64.50 10.00 89.00 271.50 571.50 868.00 1382.50 7849.50
1981 1155.50 1114.50 828.00 484.50 289.00 142.00 14.50 0.50 208.50 638.50 790.50 1365.50 7031.50
1982 2042.00 1376.00 1133.50 746.50 406.00 146.50 26.50 36.00 272.00 620.50 1135.50 1375.50 9316.50
1983 1221.00 942.00 954.00 672.00 418.50 121.50 19.00 0.00 294.50 556.00 926.50 2006.50 8131.50
1984 1322.50 890.50 1065.00 570.00 350.00 91.50 2.50 12.00 402.00 691.00 990.50 1727.00 8114.50
1985 1626.00 1373.00 981.50 489.00 185.50 156.50 15.50 74.00 390.00 666.50 1499.50 1528.50 8985.50
1986 0.00 z 0.00 z 0.00 z 0.00 z 306.90 a 19.50 21.50 19.50 359.00 528.50 1142.00 1215.00 3611.90
1987 1224.50 951.50 957.50 405.50 188.00 54.50 13.00 84.00 191.50 609.50 829.00 1243.50 6752.00
1988 1616.50 1302.50 906.00 540.00 157.50 8.50 10.00 26.00 219.00 556.50 981.00 1325.00 7648.50
1989 1472.00 1690.50 1183.00 631.00 284.50 113.00 2.50 21.50 0.00 z 576.50 931.50 1563.00 8469.00
1990 1253.00 1121.50 905.00 609.00 345.50 103.50 15.50 5.00 114.00 554.00 925.50 1625.00 7576.50
1991 1668.00 872.00 928.00 602.50 307.50 40.00 15.00 12.00 228.00 701.50 1111.00 1172.50 7658.00
1992 1122.50 941.00 818.50 611.50 320.00 105.00 101.50 109.50 243.00 589.50 1037.50 1541.50 7541.00
1993 1755.00 1495.50 924.00 631.50 259.50 181.00 122.50 88.50 329.00 646.00 1200.00 1196.50 8829.00
1994 1627.00 1531.00 864.50 606.50 236.00 80.50 19.00 35.50 111.50 561.50 1039.50 1395.50 8108.00
1995 1344.50 1033.50 1044.00 784.00 419.00 109.50 8.50 14.50 242.50 571.00 1009.66 a 1469.00 8049.66
1996 1871.00 1225.50 1372.50 650.00 468.00 60.00 12.00 9.50 269.50 610.50 1372.50 1675.50 9596.50
1997 1724.00 1060.00 963.00 754.50 350.50 19.00 30.00 38.00 127.00 545.00 989.50 1147.50 7748.00
1998 1568.50 897.00 1236.50 515.00 245.00 193.50 0.50 0.00 95.50 535.00 942.00 1361.50 7590.00
1999 1488.00 938.50 807.50 607.00 363.50 119.00 32.00 5.00 330.50 553.50 690.50 1089.50 7024.50
2000 1351.50 1140.00 810.00 584.00 260.50 124.50 0.50 16.00 196.50 519.50 1343.00 1695.00 8041.00
2001 1243.50 1393.50 924.50 596.00 244.50 132.00 2.00 10.00 154.00 606.00 807.50 1298.00 7411.50
2002 1352.00 1024.50 1523.50 756.00 425.50 97.00 0.00 38.50 183.00 855.50 870.50 1177.50 8303.50
2003 1423.00 1246.50 1127.50 460.50 340.50 147.50 7.00 12.50 272.00 426.50 1211.00 1249.00 7923.50
2004 1729.00 1367.00 822.50 522.50 394.00 207.00 16.00 53.50 175.50 596.00 900.50 1186.50 7970.00
2005 1637.50 1031.00 877.00 503.50 405.00 96.50 9.50 40.00 170.00 549.00 880.00 1448.00 7647.00
2006 1010.50 1149.00 1037.00 493.50 281.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 3971.50
Period of Record Statistics
MEAN 1558.45 1213.67 1050.99 618.61 327.36 105.54 22.49 40.01 247.72 594.25 1038.06 1425.58 8255.60
S.D. 273.07 219.78 188.93 114.36 82.19 49.55 27.23 35.64 93.83 97.70 166.38 207.49 750.11
SKEW 0.17 0.33 0.78 0.29 -0.18 0.20 2.36 0.90 0.58 0.25 0.53 0.51 0.14
MAX 2142.88 1690.50 1562.50 852.00 468.00 227.00 122.50 137.00 536.00 855.50 1499.50 2006.50 9642.04
MIN 1010.50 872.00 807.50 405.50 157.50 8.50 0.00 0.00 95.50 339.50 690.50 1089.50 6752.00
NO YRS 42 42 42 42 42 42 42 42 41 41 43 43 37