BLACKFOOT 2 SSW, IDAHO

Monthly Total Heating Degree Days

(100915)

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
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 879.37 a 532.50 d 276.33 b 8.00 n 0.00 o 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2819.69
Period of Record Statistics
MEAN 1297.50 1035.89 868.68 572.68 323.83 124.80 17.15 29.37 198.41 535.93 909.67 1249.09 7133.38
S.D. 184.57 162.07 116.00 94.50 73.72 49.67 19.52 25.58 79.37 89.97 121.85 146.80 392.25
SKEW 0.21 0.72 0.65 0.15 0.01 0.08 1.39 0.70 0.52 -0.34 0.50 0.49 0.33
MAX 1771.65 1459.50 1233.00 793.50 464.50 243.50 71.00 98.00 410.50 695.00 1197.50 1647.00 8150.60
MIN 922.50 755.00 622.50 382.00 156.19 19.50 0.00 0.00 82.50 333.00 671.50 1002.52 6292.50
NO YRS 51 49 48 49 50 47 48 52 47 47 45 49 24