BLACKFOOT, IDAHO

Monthly Total Heating Degree Days

(100915)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
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 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1044.31 a 1330.50 2374.81
1896 1145.50 993.00 906.75 e 681.00 489.28 a 112.00 7.50 34.50 241.00 575.00 1033.50 1108.25 c 7327.28
1897 1328.50 1085.50 1135.00 584.00 149.50 89.50 50.00 4.65 a 187.00 592.50 813.00 1309.00 7328.15
1898 1628.00 965.00 1016.50 479.50 340.50 84.50 17.00 8.50 256.50 588.50 g 1107.00 1442.00 7345.00
1899 1173.00 1216.50 966.00 618.00 452.50 153.50 17.00 f 91.50 243.00 694.00 797.50 1364.50 7770.00
1900 1156.50 1019.00 735.00 591.00 265.00 19.50 55.50 34.50 262.50 214.00 t 924.50 1206.50 6269.50
1901 1215.50 1080.00 937.00 644.50 132.50 102.00 4.50 0.50 277.50 423.67 a 823.50 1144.50 6785.67
1902 1391.50 879.00 909.50 587.00 273.00 77.00 50.00 0.00 0.00 z 229.00 u 948.50 1191.50 6307.00
1903 1237.00 1465.50 889.00 672.00 408.00 27.00 33.00 0.00 z 0.00 z 270.50 q 963.50 1348.00 7043.00
1904 1382.50 1125.78 d 947.00 548.00 430.00 70.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 981.50 g 4503.28
1905 1192.00 1160.50 731.00 520.00 398.50 142.00 12.50 14.00 183.50 703.50 906.50 1446.00 7410.00
1906 1365.00 1030.00 1180.00 576.50 384.50 270.00 4.50 59.00 204.00 516.00 962.00 1002.50 7554.00
1907 1377.00 795.00 844.00 595.00 410.50 276.50 36.00 103.00 253.00 438.00 900.50 1164.50 7193.00
1908 1370.00 1156.50 899.00 c 498.50 513.50 278.50 9.50 96.00 244.50 662.50 940.50 1316.00 7985.00
1909 1150.50 1028.50 870.00 722.00 486.50 137.50 48.50 19.00 215.00 558.50 847.50 1541.22 a 7624.72
1910 1540.00 1285.00 679.50 440.50 329.63 a 125.50 15.00 111.00 225.50 528.50 829.00 1145.00 7254.13
1911 1231.50 1237.00 803.33 b 672.50 402.00 121.00 61.00 97.00 286.00 698.50 1078.50 1323.91 b 8012.24
1912 1277.00 1054.88 a 1016.00 663.50 444.50 148.97 a 133.50 159.50 473.65 d 739.50 884.50 1317.00 8312.49
1913 1391.50 1295.50 1030.00 601.55 a 308.45 a 120.00 68.50 16.50 272.00 676.00 837.00 1344.00 7961.00
1914 1219.00 1132.50 844.00 515.50 268.00 169.00 6.00 43.00 333.50 528.50 871.50 1494.50 7425.00
1915 1439.50 905.00 787.00 406.50 439.00 249.50 47.50 4.00 267.50 493.50 902.00 1226.50 7167.50
1916 1460.00 1049.50 806.00 552.00 534.50 225.00 29.50 47.00 237.00 382.50 l 1130.00 1430.65 a 7501.15
1917 1621.50 1231.50 1282.62 c 663.00 435.00 225.00 2.00 34.50 167.59 a 585.50 781.50 869.00 7898.71
1918 1251.50 1141.00 823.00 705.50 463.50 44.00 15.50 107.00 275.50 661.50 1047.12 d 1251.50 7786.62
1919 1322.50 1079.00 918.00 559.00 315.00 96.50 5.50 3.00 191.00 803.50 1006.00 1516.00 7815.00
1920 1364.00 1013.00 973.50 733.50 407.00 157.00 8.00 63.50 248.00 659.00 956.50 1249.50 7832.50
1921 1179.00 1107.00 793.82 c 708.62 a 348.00 107.00 43.00 18.00 335.00 470.17 a 794.00 1203.50 7107.11
1922 1710.00 1306.50 1261.00 789.00 440.50 62.00 22.50 11.00 155.00 470.00 1118.50 1329.50 8675.50
1923 1169.00 1315.50 1097.83 b 636.00 349.50 257.00 7.23 a 30.50 196.50 709.00 877.00 1365.00 8010.06
1924 1528.00 950.50 1022.50 630.50 291.00 158.50 26.50 43.00 285.50 588.00 935.50 1549.00 8008.50
1925 1348.50 a 863.50 823.00 520.50 277.00 213.50 8.04 d 86.28 a 426.00 771.26 b 939.50 1092.00 7369.08
1926 1358.50 908.50 844.50 452.59 a 322.00 104.00 15.00 25.00 377.00 572.50 779.50 1322.84 b 7081.93
1927 1346.00 1032.50 923.00 662.00 460.00 103.00 9.50 52.00 337.00 539.00 754.00 1479.50 7697.50
1928 1306.50 1207.50 867.00 662.00 223.50 223.00 23.50 79.50 227.00 607.50 914.50 1553.32 c 7894.82
1929 1762.00 1498.00 1080.35 a 781.00 494.00 254.00 27.00 5.17 a 433.00 640.00 1137.50 1129.00 9241.02
1930 1770.50 944.09 e 902.00 424.00 417.50 171.00 13.00 11.50 236.50 673.50 1196.50 1669.00 8429.09
1931 1536.50 1224.50 1077.00 601.50 375.50 67.00 18.50 42.50 268.00 569.50 1119.00 1474.50 8374.00
1932 1558.30 c 1433.00 1128.40 a 625.00 389.00 222.00 29.00 67.50 284.50 713.00 877.00 1611.00 8937.70
1933 1393.50 1503.50 1154.50 680.00 529.00 55.00 8.00 90.50 294.31 a 0.00 z 923.00 1026.50 7657.81
1934 1060.50 807.50 662.50 408.62 a 179.00 146.38 a 5.00 10.50 270.00 484.50 793.50 1256.50 6084.50
1935 1410.50 1136.00 993.50 628.00 408.50 149.00 0.50 i 20.00 147.50 629.50 1112.00 1261.50 7896.00
1936 1395.50 1251.00 947.00 470.00 195.00 107.00 1.50 21.00 254.50 527.00 954.50 1158.50 7282.50
1937 1853.00 1229.50 991.50 743.00 357.00 246.00 6.00 47.50 130.50 459.50 795.50 1054.50 7913.50
1938 1148.00 941.00 914.00 520.00 400.00 71.50 58.50 36.00 49.00 446.00 1010.50 1093.00 6687.50
1939 1223.00 1269.50 846.50 467.50 229.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4036.00
1940 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 1017.00 1017.00
1941 1182.50 916.00 731.00 579.50 234.00 116.00 0.00 3.50 274.00 515.00 882.41 a 1056.50 6490.41
1942 1440.50 1272.00 991.50 454.50 327.50 f 35.00 o 0.00 26.83 e 137.78 c 406.62 a 836.50 1084.00 6650.22
1943 1142.00 963.00 912.00 318.50 337.50 192.12 d 6.72 a 5.50 58.00 390.50 780.00 1087.00 6192.83
1944 1450.00 1043.00 920.50 561.50 253.34 b 166.00 0.00 3.50 142.00 342.50 939.00 1284.50 7105.84
1945 1120.50 870.00 850.00 628.00 252.50 198.00 5.00 5.00 241.50 358.00 862.00 1197.12 a 6587.62
1946 1262.50 994.00 741.00 364.00 294.50 47.00 0.00 0.00 192.00 601.50 877.50 957.00 6331.00
1947 1360.00 585.50 i 768.50 619.50 246.50 237.00 4.00 45.50 263.50 0.00 z 1068.00 1304.00 5916.50
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 7.50 137.50 463.50 948.00 1331.00 2887.50
1949 1771.65 a 1117.00 807.03 a 382.00 199.00 79.50 2.50 0.00 98.50 648.00 671.50 1156.00 6932.68
1950 1288.00 963.31 b 869.00 548.28 a 366.00 111.50 12.00 11.50 213.50 360.00 759.00 1029.00 6531.08
1951 1266.00 916.00 940.00 495.00 a 244.50 186.50 10.00 36.50 181.00 584.00 916.00 1322.00 7097.50
1952 1379.00 1258.50 1111.00 483.50 234.00 80.50 14.00 6.50 97.50 385.00 1092.50 1221.00 7363.00
1953 922.50 892.50 793.50 623.00 461.00 131.50 0.00 1.50 100.50 438.00 722.00 1206.50 6292.50
1954 1081.00 828.50 957.50 484.14 a 236.50 169.00 7.00 30.50 145.00 392.00 f 714.50 1345.50 5999.14
1955 1480.00 1200.00 1063.50 668.00 316.50 113.50 29.50 0.00 205.00 409.09 c 944.00 1013.00 7442.09
1956 1070.00 1286.50 869.00 483.50 202.50 61.50 7.00 41.50 130.00 494.50 1022.50 1187.00 6855.50
1957 1522.00 936.00 782.50 571.50 245.00 83.00 1.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4141.00
1958 0.00 z 0.00 z 0.00 z 0.00 z 156.19 e 37.00 n 26.50 l 10.00 j 160.00 j 380.00 h 0.00 z 587.00 m 156.19
1959 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 165.50 u 512.57 b 904.82 b 1232.00 2649.39
1960 1446.67 a 1279.00 769.32 a 460.34 a 341.52 a 42.00 2.00 74.50 123.00 542.00 851.00 1276.50 7207.84
1961 1309.00 853.00 827.00 581.38 a 271.50 36.00 0.00 0.00 347.00 601.50 939.50 1224.50 6990.38
1962 1519.00 1001.50 1019.50 457.50 384.00 108.50 10.50 52.50 181.00 457.50 844.50 1129.50 7165.50
1963 1483.00 755.00 864.50 659.00 258.50 174.50 6.00 10.50 97.50 362.00 871.00 1446.50 6988.00
1964 1473.53 a 1459.50 0.00 z 647.00 327.00 0.00 z 0.00 z 70.50 277.24 a 490.26 d 956.50 1156.00 6857.53
1965 1148.03 a 956.67 a 994.58 a 525.00 429.00 132.50 0.00 z 58.50 0.00 z 458.00 747.32 b 1193.00 6642.60
1966 1228.00 1096.00 856.00 594.00 236.50 129.00 4.00 23.50 98.79 a 582.00 777.50 1248.00 6873.29
1967 1074.50 863.50 795.15 a 660.50 323.00 137.50 0.00 a 5.88 b 123.00 520.00 850.50 1379.00 6732.53
1968 1352.00 940.00 774.50 671.00 371.50 134.00 11.37 a 83.50 j 261.35 d 544.50 914.00 1205.00 7179.21
1969 1104.00 1012.50 1006.50 510.50 209.00 139.50 19.50 17.00 113.00 695.00 903.50 1132.00 6862.00
1970 1131.00 826.50 919.00 776.50 340.50 152.00 24.50 17.50 410.50 678.00 847.50 1236.00 7359.50
1971 1175.50 1020.50 952.50 628.00 324.00 156.50 24.50 17.50 348.00 669.50 944.00 1341.78 a 7602.28
1972 1298.50 1029.50 709.00 626.50 354.00 103.50 36.50 27.00 319.50 543.00 875.17 a 1457.50 7379.67
1973 1424.50 1117.50 939.50 644.50 298.50 142.00 19.00 20.00 234.00 503.75 a 874.50 1120.50 7338.25
1974 1374.00 998.50 840.10 a 578.00 355.50 86.50 14.50 48.50 218.00 536.00 848.00 1273.50 7171.10
1975 1399.00 1107.56 a 926.00 793.50 464.50 148.00 12.40 a 68.31 d 224.48 a 564.95 b 949.29 b 1044.04 c 7702.02
1976 1295.11 d 894.00 g 1037.95 c 638.33 c 279.60 e 193.39 b 1.11 c 59.70 d 159.83 a 614.12 b 895.86 a 1225.03 b 6400.04
1977 1548.89 c 1126.00 0.00 z 0.00 z 407.50 19.50 11.00 45.00 233.00 491.50 883.50 1057.00 5822.89
1978 1110.50 924.50 697.00 555.00 413.00 142.00 17.00 72.00 256.00 0.00 z 0.00 z 0.00 z 4187.00
1979 1672.00 1051.00 875.00 592.80 e 319.82 a 131.50 0.00 z 0.00 z 0.00 z 0.00 z 1041.00 1093.86 c 6776.97
1980 1298.68 c 874.14 a 888.00 448.89 c 375.50 147.50 0.52 a 59.50 176.79 b 514.00 0.00 z 1002.52 c 5786.03
1981 1088.62 a 966.50 773.50 521.50 367.00 0.00 z 22.00 7.00 152.59 a 585.50 793.33 c 0.00 z 5277.54
1982 1380.53 a 1164.00 858.50 723.50 406.00 142.76 a 37.00 1.50 246.50 647.00 0.00 z 823.00 i 5607.29
1983 1072.50 922.00 799.50 704.50 437.10 a 180.00 a 71.00 4.50 125.50 p 339.00 l 488.50 l 1449.77 a 5640.87
1984 1369.96 e 1315.20 b 991.50 639.00 311.00 190.50 8.50 2.00 264.00 685.00 902.50 1471.43 b 8150.60
1985 493.00 u 1404.00 1233.00 464.00 255.50 88.50 0.00 48.00 317.50 586.00 1197.50 1647.00 7241.00
1986 1313.00 879.50 622.50 566.00 356.50 43.45 a 33.00 6.89 d 175.50 j 582.80 a 932.78 c 1293.50 6629.92
1987 1458.03 a 932.50 842.00 437.07 a 272.00 0.00 z 53.50 60.00 0.00 z 478.00 0.00 z 1231.50 5764.60
1988 1423.00 992.00 876.00 448.00 309.48 a 45.00 3.00 7.50 245.00 333.00 913.50 1413.50 7008.98
1989 1537.50 1298.00 853.50 497.50 355.50 111.50 0.00 65.00 172.50 572.50 834.60 e 0.00 z 6298.10
1990 1115.50 1019.50 401.50 q 239.50 p 265.50 i 107.50 i 8.50 34.00 82.50 454.50 f 0.00 z 1589.00 3849.00
1991 1453.00 828.00 815.50 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 3096.50
1992 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 111.50 64.50 73.00 256.50 473.00 1141.50 1436.50 3556.50
1993 1520.00 1289.50 982.50 658.00 306.00 243.50 88.50 o 98.00 268.50 581.50 1144.50 1286.50 8378.50
1994 1103.50 1063.00 770.50 518.50 259.50 126.50 38.50 15.50 149.00 607.50 1138.50 0.00 z 5790.50
1995 1177.00 0.00 z 829.50 648.50 449.00 235.86 a 66.00 36.17 a 237.50 601.50 733.97 a 1123.00 6137.99
1996 1267.50 1064.50 825.00 596.00 448.50 102.50 14.50 42.00 298.50 592.50 873.10 a 1173.00 7297.60
1997 1228.00 1012.50 524.50 k 672.00 318.00 96.21 a 62.00 13.00 146.00 583.00 886.50 1337.00 6354.21
1998 1035.50 937.00 854.50 635.50 372.00 0.00 z 0.00 z 8.50 113.50 569.00 0.00 z 1360.38 a 5885.88
1999 1148.66 c 1031.69 b 785.91 d 0.00 z 0.00 z 173.28 a 34.44 d 16.69 e 165.00 i 360.00 h 565.00 f 1258.60 a 4449.27
2000 959.50 f 867.31 b 164.50 x 417.22 c 312.07 a 86.40 e 3.74 b 5.88 b 0.00 z 387.50 h 1147.80 e 1308.50 4148.92
2001 0.00 z 0.00 z 24.00 z 430.50 f 204.50 g 134.48 a 0.00 f 0.00 e 93.89 c 0.00 z 0.00 z 0.00 z 228.37
2002 0.00 z 0.00 z 0.00 z 0.00 z 213.00 i 30.50 l 0.00 21.50 156.00 650.00 351.50 r 1061.00 1888.50
2003 1017.50 955.50 745.00 548.50 198.50 h 60.50 g 0.00 e 13.12 e 171.00 393.50 994.50 1070.02 a 5908.63
2004 1410.00 1125.50 665.31 e 471.00 315.00 96.50 2.00 44.00 215.00 490.00 903.50 1119.50 6857.31
2005 1276.00 0.00 z 809.50 575.50 320.00 185.00 3.50 20.00 229.00 515.00 888.00 1291.00 6112.50
2006 1131.50 0.00 z 895.00 528.00 265.50 45.50 0.00 21.50 179.00 i 567.00 817.50 1207.50 5479.00
2007 1500.29 b 907.00 710.70 d 530.00 249.19 e 0.00 z 0.00 e 7.50 n 197.50 603.00 864.60 e 1222.71 e 6785.00
2008 1447.24 d 504.50 p 761.00 g 686.40 e 231.00 j 158.50 0.00 f 15.00 192.00 553.00 772.00 1277.00 5101.14
2009 1266.50 1165.50 787.00 f 618.50 307.50 159.00 0.00 z 37.50 76.00 680.00 922.00 1392.50 6625.00
2010 1264.50 1106.00 841.28 b 605.00 496.00 132.50 23.00 38.00 153.50 434.00 969.00 1128.50 7191.28
2011 1356.00 1146.50 866.34 c 666.00 450.53 a 171.21 a 1.50 0.00 e 81.21 a 499.62 a 930.50 1275.00 7444.40
2012 1137.00 983.50 708.00 464.00 316.00 106.07 b 4.50 1.50 102.32 b 533.50 761.50 1096.50 6214.39
2013 1581.00 a 1047.00 844.50 29.50 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 3472.50
Period of Record Statistics
MEAN 1330.00 1071.66 892.85 579.17 340.80 135.61 19.10 33.76 216.88 552.92 917.50 1257.04 7367.07
S.D. 182.92 168.86 131.79 99.99 90.05 61.72 22.31 31.81 85.78 101.39 116.30 161.06 646.50
SKEW 0.44 0.56 0.66 -0.15 0.00 0.36 2.02 1.20 0.41 -0.03 0.50 0.31 0.42
MAX 1853.00 1503.50 1282.62 793.50 534.50 278.50 133.50 159.50 473.65 803.50 1197.50 1669.00 9241.02
MIN 922.50 755.00 622.50 318.50 132.50 19.50 0.00 0.00 49.00 333.00 671.50 869.00 6084.50
NO YRS 109 105 104 106 105 102 100 106 100 96 102 107 66