HAMILTON, MONTANA

Monthly Total Heating Degree Days

(243885)

Base Temperature = 65 F

File last updated on Jul 24, 2006
*** Note *** Provisional Data *** After Year/Month 200410
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
1895 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 81.50 k 75.50 221.50 627.00 609.00 g 949.00 0.00 z 1873.00
1896 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
1897 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
1898 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 86.50 q 438.50 789.00 1242.50 2470.00
1899 1000.50 1364.50 977.50 574.00 417.50 210.50 2.50 z 101.50 f 125.00 538.00 561.00 1199.50 6968.00
1900 987.00 1039.50 697.00 554.50 343.00 86.00 48.10 b 147.50 250.50 511.00 948.10 a 933.00 6545.21
1901 1118.50 1035.50 837.00 641.00 309.00 242.00 39.50 12.00 12.00 3.00 0.00 z 0.00 z 4249.50
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 862.00 1096.50 1958.50
1903 1084.50 1106.00 902.50 606.00 419.50 92.50 124.50 70.00 327.50 608.50 1079.50 1163.50 7584.50
1904 1012.00 938.00 965.00 475.50 351.50 224.00 77.00 56.50 193.00 501.50 723.50 1059.00 6576.50
1905 1233.50 1159.50 739.50 497.00 335.50 243.50 31.00 50.00 215.00 758.00 937.78 c 0.00 z 6200.28
1906 1028.34 b 876.00 1072.50 465.50 386.50 243.50 5.00 58.00 222.50 539.00 667.00 f 310.00 u 4896.84
1907 1582.50 943.50 835.50 605.50 426.00 286.50 83.00 160.50 129.50 s 480.50 764.00 1117.72 d 7285.22
1908 1133.00 892.50 817.00 503.00 467.50 316.50 57.00 66.00 i 191.79 b 644.50 839.46 b 1178.00 a 7040.25
1909 1315.50 834.50 785.50 663.10 a 422.50 157.00 71.50 32.00 179.50 f 539.00 732.00 1253.50 6806.10
1910 1228.50 1094.50 562.00 324.00 266.50 131.00 12.40 a 127.00 343.50 479.98 a 859.00 1159.00 6587.38
1911 1199.00 1095.00 716.50 615.50 432.00 129.50 63.50 130.20 a 371.50 695.50 972.50 1187.00 7607.70
1912 1147.00 925.00 1052.00 555.00 383.00 116.50 102.00 112.50 440.17 a 687.50 809.50 1062.50 7392.67
1913 1230.50 1248.50 960.50 544.00 373.50 125.36 b 83.00 52.18 a 130.00 j 644.05 b 798.00 1354.50 7414.09
1914 959.50 1060.37 a 721.27 a 479.50 192.72 a 151.61 b 4.98 c 54.77 a 266.40 e 577.63 a 780.00 1487.48 a 6736.23
1915 930.50 f 818.74 a 695.90 b 410.00 362.81 d 244.00 89.00 j 2.00 342.00 0.00 z 767.50 f 1232.54 d 4107.99
1916 1860.00 e 1102.00 c 433.00 m 537.00 489.80 a 254.00 40.09 b 70.94 e 267.93 a 675.69 d 1032.41 a 1295.59 b 7625.44
1917 1254.35 d 1051.12 c 1186.02 b 695.50 373.50 123.62 a 16.50 89.00 318.50 0.00 z 699.60 e 445.00 n 5807.71
1918 1168.00 994.50 504.02 b 400.50 l 352.00 f 50.50 g 17.00 j 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2666.52
1919 0.00 z 0.00 z 0.00 z 476.50 335.00 131.00 12.00 40.00 0.00 z 0.00 z 0.00 z 474.00 o 994.50
1920 1106.00 976.50 980.63 a 705.00 429.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1098.43 a 5295.57
1921 1072.00 798.52 a 745.66 c 624.83 a 282.50 77.59 a 29.50 29.00 377.00 361.50 841.00 1324.00 6563.09
1922 1331.00 0.00 z 0.00 z 663.50 398.50 40.86 a 27.50 37.20 a 0.00 z 0.00 z 0.00 z 0.00 z 2498.56
1923 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 621.60 b 825.56 c 1195.57 a 2642.73
1924 1329.50 776.79 a 711.00 0.00 z 79.05 a 76.50 0.00 0.00 36.43 b 0.00 z 0.00 z 0.00 z 3009.26
1925 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
1926 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
1927 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
1928 812.50 k 1144.00 813.75 a 647.50 219.07 a 227.40 e 40.41 c 60.93 b 251.00 506.91 d 916.07 b 1258.50 6085.54
1929 1434.35 e 1220.59 a 819.43 a 676.00 390.00 192.12 d 15.50 a 1.00 373.50 570.00 881.00 903.00 7476.49
1930 1823.50 778.50 892.05 b 376.03 a 343.67 b 166.50 13.95 a 10.50 226.03 a 678.79 b 1035.00 1259.00 7603.54
1931 1047.80 a 908.44 a 781.20 a 571.50 252.65 a 96.43 b 25.50 17.00 269.00 595.95 b 1127.78 c 1271.50 6964.75
1932 1257.00 1062.26 b 960.00 578.50 331.50 141.50 24.00 61.00 229.50 587.00 722.88 d 1456.50 7411.64
1933 1181.50 1182.00 855.60 a 620.50 493.00 76.55 a 9.50 45.39 c 279.00 451.50 746.50 922.80 c 6863.85
1934 877.09 b 810.50 624.13 a 387.00 196.33 a 157.50 21.00 18.08 a 321.00 489.50 743.50 1067.50 5713.14
1935 1078.50 901.00 887.78 b 635.50 400.00 128.28 a 35.00 32.00 145.34 a 563.50 946.00 1152.50 6905.40
1936 1119.50 1572.21 a 876.50 465.00 a 162.50 113.57 b 5.50 33.50 258.75 b 534.00 1090.34 a 975.00 7206.38
1937 1870.00 1066.07 a 886.00 596.90 a 282.00 193.00 8.50 g 62.50 153.50 471.50 796.00 1050.50 7427.97
1938 1150.50 1094.00 896.00 545.00 374.00 107.14 b 28.50 43.40 a 88.50 529.58 a 971.50 1031.00 6859.13
1939 952.50 1097.00 770.50 435.52 a 230.00 225.52 a 22.50 27.00 180.00 477.92 a 889.50 957.00 6264.95
1940 1365.55 a 847.00 756.00 562.50 213.50 99.50 14.50 13.50 170.17 a 473.00 1038.21 b 1080.50 6633.94
1941 1135.00 912.00 662.88 a 536.00 293.50 155.50 6.50 67.50 385.50 660.82 a 866.50 1147.00 6828.70
1942 1551.00 1180.00 852.50 452.00 420.00 247.00 13.00 58.00 202.50 499.50 946.00 1056.00 7477.50
1943 1389.83 a 1024.00 1046.00 465.50 475.00 270.00 39.00 59.00 161.00 516.00 921.50 1341.00 7707.83
1944 1186.50 980.00 952.00 529.00 322.50 199.50 41.00 75.50 210.00 467.00 899.00 1362.50 7224.50
1945 1090.00 884.00 862.00 663.00 361.50 218.00 14.50 21.00 292.50 450.00 863.00 1231.73 a 6951.23
1946 1054.00 869.00 694.00 482.50 351.50 167.50 34.50 56.50 274.00 701.50 989.50 1022.50 6697.00
1947 1212.00 878.50 753.00 530.00 221.50 213.50 9.50 48.00 262.50 446.00 975.50 1070.50 6620.50
1948 1210.00 1089.50 962.00 586.00 351.50 107.50 54.00 46.50 253.50 609.50 911.50 1452.50 7634.00
1949 1761.00 1109.00 959.50 426.00 231.50 133.00 41.00 33.50 190.00 673.50 719.50 1149.00 7426.50
1950 1520.00 964.00 906.00 621.00 434.50 208.00 44.00 56.50 256.07 b 483.50 933.00 993.03 a 7419.60
1951 1289.00 971.50 1003.00 540.50 361.50 246.50 51.00 77.50 280.50 633.50 990.00 1345.50 7790.00
1952 1338.00 1032.50 965.50 399.00 297.50 144.00 41.00 36.50 158.00 472.50 1034.50 1161.50 7080.50
1953 804.50 847.50 749.50 617.00 456.50 222.00 16.50 64.50 151.00 503.00 757.00 964.50 6153.50
1954 1170.50 804.00 928.50 540.00 321.50 260.50 25.50 122.00 266.00 650.50 726.50 1173.50 6989.00
1955 1287.50 1071.00 1147.50 692.00 450.50 204.00 120.00 17.50 313.00 509.50 1121.50 1302.00 8236.00
1956 1229.50 1197.00 928.00 559.00 296.50 166.00 54.50 85.50 214.50 590.50 983.50 961.00 7265.50
1957 1616.00 1034.50 862.50 608.50 232.00 144.50 26.00 63.00 193.50 665.00 916.03 a 935.50 7297.03
1958 1111.50 771.50 878.50 632.00 181.00 129.00 60.00 24.00 259.50 549.00 882.00 960.50 6438.50
1959 1069.00 1090.50 802.50 566.00 489.00 137.50 47.02 a 71.50 323.00 595.00 1078.00 1120.50 7389.52
1960 1405.00 1047.00 906.00 609.00 426.50 107.50 7.50 129.50 207.00 541.50 877.50 1299.50 7563.50
1961 1099.00 765.00 795.50 655.00 398.00 59.00 4.50 10.50 415.00 635.00 1036.00 1170.50 7043.00
1962 1383.00 964.00 905.50 526.50 424.50 168.50 63.50 84.00 264.00 608.50 863.00 967.50 7222.50
1963 1571.00 763.00 806.00 620.50 341.00 220.00 60.50 66.00 178.50 489.50 828.00 1313.00 7257.00
1964 1103.00 975.00 981.50 683.50 433.00 226.50 24.50 134.50 350.50 606.50 924.00 1219.00 7661.50
1965 1037.00 851.50 1116.00 561.00 439.00 187.00 43.00 105.00 512.50 513.50 845.50 1109.50 7320.50
1966 1082.00 937.00 879.50 612.50 282.50 234.50 25.50 75.50 156.50 580.50 811.50 968.00 6645.50
1967 964.50 794.00 893.50 726.50 396.00 153.50 5.50 7.00 115.50 550.50 919.50 1235.50 6761.50
1968 1245.00 912.50 706.50 686.50 460.00 202.00 53.50 147.50 319.50 643.50 846.50 1191.00 7414.00
1969 1309.50 1134.50 972.50 474.50 272.50 170.00 50.00 45.00 226.50 723.50 843.50 1130.00 7352.00
1970 1175.50 841.50 937.50 758.50 349.50 137.50 31.50 25.00 404.50 697.00 903.00 1172.50 7433.50
1971 1091.50 911.50 918.50 629.50 359.50 220.50 77.50 15.00 417.00 705.50 835.50 1184.00 7365.50
1972 1234.00 934.50 674.50 660.00 352.50 104.50 64.50 39.00 369.50 702.50 965.50 1427.50 7528.50
1973 1256.00 965.00 829.00 680.00 361.50 178.50 44.00 39.00 279.00 560.50 994.00 1029.50 7216.00
1974 1356.50 789.00 858.00 565.50 491.00 114.50 51.00 98.50 288.00 592.50 842.00 1053.50 7100.00
1975 1164.50 1109.50 932.00 762.00 462.00 231.00 17.50 101.00 268.00 569.50 934.50 1102.50 7654.00
1976 1051.00 959.00 961.50 593.00 283.50 262.50 17.50 77.00 199.50 592.10 a 925.00 1123.00 7044.60
1977 1342.00 842.50 899.00 489.50 456.00 84.00 66.00 76.50 313.50 644.00 1002.50 1150.00 7365.50
1978 1173.50 921.50 695.00 580.50 468.00 140.50 61.00 95.00 260.00 534.00 1139.50 1393.00 7461.50
1979 1811.00 969.00 785.50 609.00 331.18 a 130.50 54.00 45.50 199.00 581.50 1146.00 1023.50 7685.68
1980 1425.50 1004.50 958.00 462.00 342.50 220.50 61.50 137.50 238.00 601.00 878.00 925.00 7254.00
1981 1168.00 912.00 796.50 566.50 456.50 286.50 60.50 12.00 233.50 600.00 885.00 1116.50 7093.50
1982 1237.42 a 1082.00 826.00 694.50 416.50 158.00 79.50 39.00 327.00 665.50 1065.00 1308.50 7898.92
1983 1049.00 837.00 786.50 633.50 376.00 150.00 104.00 12.50 374.50 578.00 818.50 1599.00 7318.50
1984 1094.50 854.50 754.50 591.50 419.50 229.00 28.50 26.50 368.50 695.50 888.00 1272.00 7222.50
1985 1410.00 1089.50 857.50 463.00 278.50 116.00 0.00 110.05 a 428.00 662.00 1233.62 a 1469.50 8117.67
1986 1023.50 914.50 650.00 586.00 342.00 52.76 a 90.50 18.50 413.50 576.50 948.50 1328.00 6944.26
1987 1233.50 898.50 782.00 405.50 254.00 120.00 88.50 124.00 179.50 534.50 876.50 1188.00 6684.50
1988 1247.50 864.00 772.50 465.50 336.00 116.50 45.00 56.50 275.50 373.50 824.50 1152.00 6529.00
1989 1019.00 1330.00 934.00 492.00 360.00 107.00 12.00 112.50 231.00 610.00 780.50 1207.50 7195.50
1990 991.50 955.00 825.00 480.50 423.00 202.50 22.50 76.00 101.00 616.50 777.50 1470.50 6941.50
1991 1169.00 740.00 903.00 623.50 433.00 238.00 13.00 5.00 195.50 616.00 968.00 1152.50 7056.50
1992 1076.50 784.50 660.00 502.50 230.50 110.00 91.50 106.00 280.00 545.00 988.00 1345.00 6719.50
1993 1518.00 1311.50 779.50 615.50 230.00 237.50 204.00 123.00 291.50 540.50 1087.00 1063.00 8001.00
1994 890.50 997.50 732.00 489.50 279.00 187.00 33.00 26.00 183.50 627.50 969.00 1124.50 6539.00
1995 1191.00 831.00 857.50 640.50 394.50 221.00 52.00 97.50 268.50 662.50 795.50 1172.50 7184.00
1996 1247.00 1122.00 930.50 561.00 481.50 148.50 17.00 64.50 303.50 620.50 951.00 1171.00 7618.00
1997 1225.00 968.50 791.50 683.00 264.50 149.00 57.00 24.00 192.00 601.50 909.00 1171.00 7036.00
1998 1090.50 857.50 790.00 531.00 297.00 237.00 2.00 15.00 125.50 634.00 807.50 1138.00 6525.00
1999 973.50 881.50 775.50 614.00 410.50 185.00 66.50 29.97 a 255.00 552.50 750.50 1019.50 6513.97
2000 1078.00 912.50 746.50 470.50 334.00 104.00 29.50 38.50 291.50 602.00 1145.00 1291.00 7043.00
2001 1194.50 1054.00 778.00 622.00 284.00 206.50 39.00 1.50 107.50 561.50 783.50 1204.50 6836.50
2002 1071.50 906.50 1005.00 615.50 420.50 163.00 16.00 75.50 220.00 728.50 881.00 1086.00 7189.00
2003 1019.50 973.00 748.50 563.00 375.50 112.00 0.50 12.50 211.00 520.50 1112.50 1145.00 6793.50
2004 1376.00 960.00 647.38 a 517.00 392.50 182.00 24.50 75.50 323.50 426.00 g 0.00 z 0.00 z 4498.38
Period of Record Statistics
MEAN 1218.75 979.32 844.28 566.97 353.33 169.43 41.84 60.18 259.81 571.65 904.45 1170.08 7127.73
S.D. 213.49 147.91 123.04 89.03 85.70 59.94 32.68 42.74 98.54 99.93 120.89 146.21 459.75
SKEW 1.15 0.98 0.09 -0.25 -0.54 0.11 1.65 0.94 0.51 -1.94 0.22 0.42 -0.22
MAX 1870.00 1572.21 1186.02 762.00 493.00 316.50 204.00 221.50 627.00 758.00 1233.62 1599.00 8236.00
MIN 804.50 740.00 504.02 324.00 79.05 40.86 0.00 0.00 12.00 3.00 561.00 903.00 5713.14
NO YRS 98 99 98 99 100 99 97 98 95 95 96 95 82