ST IGNATIUS, MONTANA

Monthly Total Heating Degree Days

(247286)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201012
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
1896 0.00 z 850.67 e 970.50 600.00 505.50 154.00 0.00 n 27.50 t 366.50 599.85 a 998.79 a 881.29 c 5927.10
1897 1206.50 1020.96 a 1056.50 503.00 176.00 150.50 0.00 z 39.78 a 325.50 646.00 916.50 1094.50 7135.75
1898 1201.00 826.50 1010.50 556.50 401.50 167.50 0.00 z 21.00 o 323.28 a 695.50 1010.50 1276.50 7469.28
1899 1203.66 b 1366.50 988.90 a 628.00 492.00 236.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4915.06
1900 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
1901 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
1902 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
1903 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
1904 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
1905 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
1906 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
1907 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
1908 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 429.50 n 811.55 a 1163.00 1974.55
1909 1391.38 a 646.50 g 840.50 685.00 438.65 a 177.00 95.77 c 74.83 b 234.00 580.73 a 822.50 1334.03 a 6674.40
1910 1257.00 1247.56 a 696.97 b 408.50 303.00 154.50 37.72 a 154.50 301.11 c 486.00 834.64 b 1075.18 a 6956.68
1911 1206.93 a 1130.08 c 793.17 b 633.10 a 462.00 158.00 56.00 l 147.25 c 362.07 a 708.87 a 1035.00 1168.18 a 7804.66
1912 1231.00 944.00 1014.50 536.50 415.50 132.50 101.00 112.12 a 468.00 652.00 826.00 1060.00 7493.12
1913 1288.50 1261.00 1067.50 584.50 479.00 199.50 95.00 76.50 253.97 a 662.50 826.55 a 1225.53 a 8020.05
1914 985.80 a 1124.67 a 777.58 a 577.76 a 350.50 230.00 21.00 76.98 a 319.14 a 673.22 a 828.10 a 1405.85 a 7370.60
1915 1428.14 b 1085.78 a 856.63 a 420.50 414.00 237.50 144.84 b 3.00 375.00 539.50 934.50 1182.00 7621.39
1916 1876.00 1154.20 d 790.00 590.17 a 541.98 a 252.41 a 88.72 b 79.05 a 293.50 673.22 a 1034.50 1444.60 a 8818.36
1917 1334.03 a 1080.50 1161.50 683.00 404.55 a 273.50 21.59 c 51.50 194.00 586.93 a 822.41 a 919.87 e 7533.38
1918 1209.00 1036.00 766.50 623.04 b 382.85 a 66.00 h 19.24 b 92.40 e 165.58 d 468.74 b 943.39 b 1055.79 e 6762.53
1919 1156.30 a 1082.08 d 887.67 e 526.55 a 421.17 b 189.50 33.58 a 36.68 a 307.78 c 810.98 c 722.00 h 1519.00 6971.31
1920 1158.50 981.00 918.63 a 716.00 484.50 304.50 17.50 89.50 284.00 647.00 911.00 1069.00 7581.13
1921 1132.50 872.00 828.00 613.50 314.50 82.50 39.50 51.50 425.00 483.60 a 946.00 1255.50 7044.10
1922 1489.50 1304.00 1046.50 703.00 427.50 58.00 52.00 43.50 177.50 557.50 1041.50 1312.50 8213.00
1923 1015.00 1260.00 a 919.50 642.00 386.00 205.50 19.50 44.50 207.22 c 612.25 a 875.00 1115.50 7301.97
1924 1391.50 830.00 910.00 639.00 264.00 245.00 74.50 118.32 a 309.50 592.00 992.50 1503.50 7869.82
1925 1072.50 758.00 814.00 510.50 295.50 207.50 10.50 121.50 305.69 a 756.50 926.00 944.00 6722.19
1926 1221.00 810.00 805.50 508.50 398.50 185.00 31.00 72.50 461.00 532.50 618.50 h 1135.50 6161.00
1927 1278.00 981.50 826.00 648.50 494.50 145.50 43.50 69.00 335.50 546.00 764.00 1538.12 a 7670.12
1928 1225.50 1135.50 833.00 659.00 251.50 234.00 65.50 121.00 268.50 621.00 910.50 1295.50 7620.50
1929 1700.50 1402.50 869.00 696.50 431.50 253.00 51.00 24.50 446.50 649.50 1031.50 1033.00 8589.00
1930 1869.00 837.00 957.00 465.50 427.00 260.00 52.00 35.50 282.50 681.00 1005.00 1168.50 8040.00
1931 1030.00 939.50 804.00 545.17 a 267.00 90.50 27.50 24.00 289.00 625.00 454.50 l 0.00 z 4641.67
1932 939.00 i 1071.50 1082.00 570.00 351.50 149.00 41.00 64.00 290.00 573.00 706.50 1369.50 6268.00
1933 1108.50 1176.00 840.00 611.50 480.00 107.50 23.50 63.00 314.50 500.00 775.00 941.50 6941.00
1934 879.50 862.00 664.50 393.50 249.50 164.00 31.00 26.00 339.50 524.00 729.50 1059.00 5922.00
1935 1179.50 967.50 919.50 723.50 408.00 189.50 60.50 82.00 195.00 591.00 1013.00 1048.00 7377.00
1936 1078.50 1652.00 901.00 550.50 215.50 126.72 a 9.00 38.00 266.00 493.00 1143.50 984.50 7458.22
1937 1927.00 1111.00 917.00 606.50 319.00 138.50 0.00 n 75.50 201.50 492.50 767.00 1039.50 7595.00
1938 1099.00 1170.50 902.00 550.00 352.50 93.00 14.50 45.00 117.50 569.50 999.00 1046.00 6958.50
1939 938.50 1085.00 811.50 487.00 274.00 250.34 a 50.00 38.20 c 207.50 513.00 886.50 921.50 6463.04
1940 1418.00 923.50 675.50 502.50 232.00 89.50 8.00 27.00 130.00 435.00 1088.00 1020.00 6549.00
1941 1112.00 869.00 686.00 485.00 301.00 129.50 0.00 a 53.00 358.00 640.50 877.50 1052.00 6563.50
1942 1523.00 1179.23 b 872.00 519.31 a 427.00 278.00 34.00 72.00 213.50 516.50 864.00 1037.00 7535.54
1943 1463.00 1079.00 1126.85 a 474.50 459.00 309.50 57.00 63.00 217.00 533.50 933.50 1179.00 7894.85
1944 1101.00 1006.00 959.50 533.50 317.00 165.50 62.50 79.00 209.50 472.00 841.50 1259.12 a 7006.12
1945 982.50 897.00 832.50 669.00 360.00 227.00 28.00 27.90 a 328.50 487.73 a 825.00 1190.00 6855.13
1946 1008.50 862.00 717.00 526.50 349.50 199.50 30.50 65.00 263.00 724.00 997.24 a 1073.00 6815.74
1947 1269.50 900.00 810.00 538.50 265.50 236.90 a 26.50 79.50 283.00 476.00 934.50 1040.00 6859.90
1948 1082.42 a 1006.00 1012.00 594.00 348.00 99.50 93.50 72.50 271.00 635.50 845.00 1339.00 7398.42
1949 1795.50 1161.00 979.00 449.00 254.00 143.00 56.00 55.50 258.00 675.50 772.00 1087.00 7685.50
1950 1623.00 1000.50 922.00 634.00 444.50 213.00 50.00 48.50 287.50 497.00 936.00 978.50 7634.50
1951 1179.00 931.50 1019.50 582.50 387.50 276.50 71.00 72.50 312.00 638.00 913.50 1313.00 7696.50
1952 1345.00 996.50 928.50 480.00 314.50 191.00 63.50 61.00 188.00 513.50 968.00 1072.00 7121.50
1953 784.82 a 828.00 785.00 649.00 447.00 224.50 22.00 46.50 152.50 494.50 753.50 929.50 6116.82
1954 1218.50 852.00 1001.50 591.00 305.50 222.00 24.00 76.50 271.00 690.00 749.00 1093.00 7094.00
1955 1212.50 1069.00 1146.00 684.50 450.00 145.50 114.50 15.00 263.79 a 527.00 1185.50 1222.00 8035.29
1956 1210.00 1300.50 979.50 540.50 299.00 158.00 53.00 64.00 195.00 578.00 946.00 1022.00 7345.50
1957 1651.50 1054.50 912.50 587.00 224.00 128.50 17.50 58.50 181.00 713.00 914.50 905.00 7347.50
1958 1035.50 901.50 885.50 599.00 151.00 116.50 57.50 17.50 247.50 586.50 902.00 1064.50 6564.50
1959 1103.00 1102.50 827.50 545.50 482.50 140.50 48.50 64.50 310.00 568.00 1109.00 1111.00 7412.50
1960 1401.50 1074.00 906.00 589.50 399.50 125.50 5.50 102.50 212.00 551.50 887.50 1195.50 7450.50
1961 1090.50 723.00 829.50 653.00 369.50 49.00 7.50 0.50 380.50 659.00 1069.50 1190.50 7022.00
1962 1492.98 c 993.50 972.00 484.00 408.50 169.00 71.50 76.50 269.50 606.50 792.00 957.50 7293.48
1963 1618.00 868.50 757.50 606.50 346.50 163.00 53.00 42.00 139.00 498.50 816.50 1312.50 7221.50
1964 1046.50 921.00 930.00 633.00 402.00 145.00 17.50 108.50 340.50 634.50 882.50 1252.50 7313.50
1965 1062.00 913.00 1108.50 541.00 414.00 200.50 37.00 79.50 490.00 483.00 815.00 1049.50 7193.00
1966 1098.50 1019.50 870.50 611.50 302.00 219.00 37.50 75.00 109.50 564.50 886.50 1003.50 6797.50
1967 971.00 794.50 934.50 726.00 383.00 152.00 8.00 6.00 105.50 531.50 932.50 1155.50 6700.00
1968 1238.50 860.50 691.50 649.00 405.50 167.50 42.00 102.00 282.50 640.50 870.50 1305.50 7255.50
1969 1499.50 1156.00 1084.50 511.50 297.50 177.00 70.50 63.00 238.00 714.00 901.50 1116.50 7829.50
1970 1229.50 913.00 934.00 734.00 329.50 118.00 27.50 26.50 405.00 700.00 992.50 1155.00 7564.50
1971 1155.00 928.00 920.00 594.00 313.00 216.00 78.50 13.50 383.50 701.50 897.50 1224.00 7424.50
1972 1290.50 996.50 710.50 665.50 326.00 109.50 73.00 18.50 323.00 698.00 891.50 1358.00 7460.50
1973 1261.00 946.00 774.00 602.00 333.00 158.00 29.00 43.00 298.50 604.00 945.50 982.50 6976.50
1974 1329.50 811.50 857.00 567.50 471.00 106.50 33.50 57.50 261.50 583.00 838.00 1043.00 6959.50
1975 1162.00 1071.50 953.00 737.50 446.50 0.00 z 11.50 98.00 284.00 595.50 946.50 1055.00 7361.00
1976 1072.00 910.00 932.50 603.00 307.00 264.00 35.00 84.00 235.00 621.50 922.00 1090.50 7076.50
1977 1359.50 915.00 858.50 509.00 420.00 79.50 65.50 63.00 304.00 479.00 h 971.50 1219.50 6765.00
1978 1241.55 a 1020.00 821.50 580.00 458.50 137.07 a 71.50 101.00 286.00 585.50 1145.00 1418.50 7866.12
1979 1905.50 1030.50 847.50 623.00 370.00 142.50 63.00 45.00 194.00 510.00 1057.50 1029.00 7817.50
1980 1451.50 1008.50 965.50 456.50 333.50 202.50 60.00 157.07 a 267.50 607.50 834.50 967.72 a 7312.28
1981 1026.50 873.00 781.00 538.00 375.00 272.00 69.50 17.50 240.52 a 613.50 894.00 1131.50 6832.02
1982 1254.50 1070.50 807.50 687.00 413.00 136.50 95.00 35.00 291.50 630.00 1051.50 1167.00 7639.00
1983 981.00 766.50 752.00 608.50 357.00 170.00 120.00 30.50 372.00 607.00 807.50 1558.50 7130.50
1984 1157.00 884.50 740.00 597.50 424.50 232.76 a 42.50 28.00 375.00 681.50 875.00 1243.10 a 7281.36
1985 1333.50 1156.50 883.50 488.00 275.38 a 117.00 0.00 92.50 386.38 a 658.00 1287.50 1502.50 8180.76
1986 1072.00 981.00 608.00 552.50 331.00 50.00 0.00 z 7.50 367.00 656.00 969.00 1309.00 6903.00
1987 1229.00 956.50 805.50 399.50 233.00 111.50 81.00 123.00 185.50 582.00 861.50 1078.00 6646.00
1988 1153.20 a 899.00 747.50 486.50 299.50 100.00 32.00 32.50 215.00 413.00 779.00 1146.50 6303.70
1989 1076.50 1380.00 1005.50 498.50 336.50 91.00 7.00 97.00 260.00 575.50 762.00 1190.00 7279.50
1990 959.00 951.50 812.00 492.00 394.00 184.00 30.50 63.00 110.50 573.50 747.50 1426.50 6744.00
1991 1292.00 739.50 893.50 582.50 386.00 212.50 17.50 4.50 211.50 597.00 990.50 1045.00 6972.00
1992 1030.00 855.50 702.00 500.50 255.50 93.50 86.00 102.50 293.00 526.00 950.00 1274.50 6669.00
1993 1442.50 1301.50 797.00 567.50 229.00 194.50 202.50 105.50 293.00 543.50 1111.50 1074.50 7862.50
1994 882.50 1054.00 740.00 506.50 288.00 180.50 26.50 20.50 148.00 602.50 936.50 1064.00 6449.50
1995 1122.50 794.00 852.00 613.50 351.00 193.00 35.00 103.00 226.50 639.50 759.00 1092.50 6781.50
1996 1276.50 1119.00 960.00 545.00 484.50 137.00 29.00 55.50 283.00 603.00 1031.00 1209.50 7733.00
1997 0.00 z 915.50 796.50 0.00 z 272.00 191.54 d 58.50 k 15.50 m 148.50 i 572.00 883.50 648.00 m 3631.04
1998 491.50 p 839.50 620.00 i 324.00 j 309.50 196.50 5.00 26.50 117.50 616.00 782.00 1075.50 3968.00
1999 957.50 828.50 742.50 635.00 426.00 193.50 86.50 19.50 294.50 567.00 727.00 964.50 6442.00
2000 1050.00 997.00 756.50 521.50 370.50 172.50 48.50 53.00 289.50 647.50 1064.00 1331.45 a 7301.95
2001 1244.00 1182.00 878.50 640.00 301.00 225.50 52.50 13.50 117.00 607.50 766.03 a 494.00 p 6027.53
2002 1071.50 945.50 1081.00 643.50 457.50 179.00 28.00 68.00 189.00 703.50 914.50 1002.00 7283.00
2003 977.00 941.50 801.50 541.50 391.00 128.50 6.00 4.00 189.00 490.00 1120.50 1171.50 6762.00
2004 1315.50 953.50 663.00 473.00 399.00 165.00 26.00 52.50 257.50 554.50 846.00 517.00 o 5705.50
2005 785.50 k 601.00 i 731.50 553.00 339.00 214.80 e 23.00 31.50 f 224.00 417.50 g 603.00 i 921.00 k 2085.30
2006 856.67 e 991.00 824.37 d 505.50 308.50 91.00 1.50 27.50 200.50 565.00 851.50 1110.50 6333.54
2007 1188.50 908.50 647.00 534.00 305.00 113.50 1.50 36.00 225.00 523.50 916.50 1089.00 6488.00
2008 1220.50 870.50 881.50 730.00 362.50 211.00 8.00 42.00 239.50 563.50 740.50 1303.00 7172.50
2009 1101.50 915.50 924.50 577.50 358.50 138.50 37.00 59.50 127.00 719.00 792.50 1315.50 7066.50
2010 1048.00 840.00 745.50 612.00 440.50 0.00 z 64.00 69.50 249.00 539.00 977.50 1176.50 6761.50
Period of Record Statistics
MEAN 1229.53 1001.17 869.95 575.84 362.34 171.78 45.40 60.03 266.72 592.28 910.92 1155.50 7235.36
S.D. 231.37 161.51 118.42 78.13 78.88 57.49 33.75 34.58 83.04 76.32 113.45 154.54 540.29
SKEW 1.07 1.05 0.26 -0.01 -0.18 0.13 1.48 0.52 0.23 0.14 0.57 0.64 0.19
MAX 1927.00 1652.00 1161.50 737.50 541.98 309.50 202.50 157.07 490.00 810.98 1287.50 1558.50 8818.36
MIN 784.82 723.00 608.00 393.50 151.00 49.00 0.00 0.50 105.50 413.00 706.50 881.29 5922.00
NO YRS 101 104 105 104 106 103 98 101 104 103 102 101 85