HUNTLEY EXP STN, MONTANA

Monthly Total Heating Degree Days

(244345)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201304
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
1911 1559.00 1428.50 780.00 683.00 323.00 44.00 41.50 104.00 258.00 672.00 1178.50 1324.50 8396.00
1912 1458.50 1062.00 1428.50 538.00 344.50 101.00 38.50 43.00 413.50 657.00 782.00 1086.00 7952.50
1913 1598.57 a 1319.50 1278.00 565.50 371.50 43.50 33.50 67.50 257.59 a 713.50 812.00 1229.50 8290.15
1914 1193.50 1291.00 904.50 566.00 317.50 108.50 4.00 76.00 200.50 531.00 772.00 1550.00 7514.50
1915 1428.50 1083.50 994.50 328.50 362.18 a 223.50 92.00 17.00 347.50 493.00 1037.00 1320.00 7727.18
1916 2147.00 1207.50 794.00 593.50 431.50 145.50 7.50 38.00 278.50 719.00 996.50 1576.50 8935.00
1917 1441.50 1276.50 1273.00 720.50 452.50 181.00 4.00 49.50 180.00 664.50 663.50 1450.00 8356.50
1918 1554.50 1207.50 766.00 721.50 391.00 56.50 47.50 45.00 276.00 463.00 1165.50 1106.50 7800.50
1919 982.00 1244.96 a 1049.50 534.50 296.00 66.50 12.50 12.50 200.50 920.00 1235.50 1525.00 8079.46
1920 1327.50 1095.50 1103.00 814.50 374.00 123.50 15.00 53.50 212.50 559.00 1012.00 1271.00 7961.00
1921 1147.00 956.50 965.50 619.00 364.00 47.50 31.50 24.00 308.50 452.00 1086.50 1352.50 7354.50
1922 1618.00 1631.50 1030.50 650.50 358.00 57.50 42.00 2.50 141.00 502.00 1039.50 1538.50 8611.50
1923 1167.50 1250.50 1040.50 679.50 314.00 105.50 11.00 48.50 209.50 673.50 777.00 1199.50 7476.50
1924 1509.50 888.50 1114.50 618.00 408.00 154.00 39.50 73.00 250.00 511.00 952.50 1593.00 8111.50
1925 1288.00 971.00 918.00 476.50 300.00 148.50 12.40 a 37.50 250.50 922.00 876.00 1054.50 7254.90
1926 1124.00 786.07 a 899.00 515.50 224.50 101.50 14.50 39.00 432.00 435.00 972.50 1302.50 6846.07
1927 1435.00 1130.50 885.50 662.00 468.50 137.00 37.50 47.00 283.00 484.00 1106.00 1751.00 8427.00
1928 1355.50 1126.50 768.50 652.50 191.00 156.50 25.00 87.00 249.50 637.50 909.00 1241.00 7399.50
1929 1830.00 1509.00 882.50 651.50 404.50 136.50 15.00 2.00 356.50 501.50 1011.50 1367.00 8667.50
1930 1815.50 832.00 1013.00 357.00 327.00 116.00 8.50 26.00 205.50 745.50 920.50 1002.00 7368.50
1931 1065.50 845.00 931.00 570.50 309.00 30.00 22.50 25.50 200.00 545.50 1000.00 1177.00 6721.50
1932 1399.00 1142.00 1278.00 536.00 260.50 108.50 16.50 45.00 244.50 729.50 885.00 1431.50 8076.00
1933 1400.00 1349.00 829.50 656.50 373.00 10.00 4.00 65.00 250.00 516.00 808.50 1346.50 7608.00
1934 1027.50 932.50 904.00 471.50 141.50 77.00 11.00 71.50 366.00 446.50 765.50 1163.00 6377.50
1935 1343.00 862.50 1136.50 722.50 421.00 140.50 3.50 59.42 a 191.50 593.50 1058.50 1064.50 7596.92
1936 1410.00 1968.50 931.50 595.34 a 173.50 59.00 2.50 22.00 219.00 519.50 886.50 1288.50 8075.84
1937 1983.00 1338.00 964.50 559.50 208.00 149.00 9.00 22.50 176.00 475.50 975.00 1258.00 8118.00
1938 1094.50 1224.00 925.50 540.50 384.00 77.50 12.00 59.00 100.00 457.50 975.00 1121.00 6970.50
1939 1067.00 1382.50 899.50 546.50 235.50 188.00 8.50 70.00 231.00 537.00 779.00 942.00 6886.50
1940 1665.50 1129.50 819.50 678.00 221.00 87.93 a 7.00 26.50 85.50 406.00 1143.00 1084.00 7353.43
1941 1171.00 1042.00 926.50 605.50 251.50 132.00 7.00 35.00 352.50 619.00 825.50 1241.50 7209.00
1942 1230.50 1257.00 901.00 516.00 418.00 157.76 a 10.50 41.00 248.00 514.50 981.00 1209.50 7484.76
1943 1668.50 1001.50 1284.50 426.50 435.00 159.00 26.00 15.50 238.00 476.50 833.00 1071.50 7635.50
1944 1171.50 1255.50 1114.45 a 542.59 a 230.50 206.50 30.50 53.73 a 254.50 455.00 972.00 1325.00 7611.77
1945 1307.50 1108.50 880.50 730.00 429.00 234.50 12.00 41.50 342.00 455.50 994.50 1406.00 7941.50
1946 1134.00 1018.50 754.00 411.72 a 407.50 109.50 7.00 56.00 247.00 714.50 1053.50 1280.30 a 7193.52
1947 1265.00 1205.50 1141.00 607.50 323.00 189.00 0.00 27.50 233.50 439.00 1020.50 1210.55 a 7662.05
1948 1147.00 1240.27 a 1115.00 525.00 279.00 95.50 10.00 7.50 146.50 530.50 937.50 1567.50 7601.27
1949 1866.50 1438.00 1050.00 408.00 217.00 110.00 17.00 24.00 235.00 753.30 a 610.00 1509.50 8238.30
1950 2078.50 1093.56 a 1106.00 672.00 466.50 171.21 a 63.00 47.00 323.00 487.50 1092.00 1143.00 8743.26
1951 1487.50 1082.50 1365.00 708.00 301.50 240.50 57.50 54.00 348.50 682.00 972.00 1612.50 8911.50
1952 0.00 z 1158.50 1057.50 452.00 271.50 73.50 38.50 29.00 136.00 515.50 1040.00 1149.50 5921.50
1953 969.00 911.50 875.00 737.07 a 459.50 131.00 8.00 12.50 164.50 386.00 740.89 b 1052.45 a 6447.41
1954 1651.50 753.50 1193.50 692.50 417.50 191.50 8.50 39.00 205.50 594.50 688.50 1070.50 7506.50
1955 1260.50 1298.00 1237.50 665.00 320.50 140.50 33.50 12.50 269.00 452.50 1299.50 1503.50 8492.50
1956 1567.50 1358.00 947.50 708.50 301.50 35.17 a 20.50 54.25 a 194.50 496.00 872.00 1109.00 7664.42
1957 1746.00 1177.00 1004.92 a 690.00 274.00 129.00 7.50 26.87 a 224.00 628.27 a 931.50 939.00 7778.05
1958 1043.50 1206.50 983.50 628.50 138.95 c 185.50 56.50 16.00 214.50 516.00 879.50 1256.50 7125.45
1959 1450.00 1419.00 807.50 699.50 449.50 89.50 35.50 17.50 275.50 622.00 1121.50 1016.00 8003.00
1960 1393.50 1204.00 997.50 624.50 319.50 88.50 10.50 67.00 214.50 497.00 928.00 1172.50 7517.00
1961 1100.50 737.50 760.50 618.00 262.00 19.00 1.00 4.00 375.00 573.00 1021.00 1301.00 6772.50
1962 1416.50 1102.00 1102.00 444.00 303.00 90.00 7.50 48.50 212.50 377.50 760.50 1010.50 6874.50
1963 1604.50 817.00 761.00 570.00 279.50 80.00 2.00 7.50 48.00 329.00 834.00 1327.50 6660.00
1964 1104.00 937.00 1024.00 558.00 252.50 120.50 0.00 80.50 262.00 439.50 1022.00 1578.50 7378.50
1965 1244.00 1089.50 1285.50 567.50 336.00 107.50 5.00 48.50 512.50 400.00 859.66 a 1189.00 7644.66
1966 1676.50 1215.50 881.50 681.50 282.00 114.00 0.00 71.00 111.50 533.50 1071.00 1367.00 8005.00
1967 1188.00 855.50 1006.00 648.00 366.50 136.07 b 3.50 8.50 107.00 448.50 885.50 1326.00 6979.07
1968 1466.30 a 931.50 689.50 619.00 350.00 137.50 21.00 39.00 185.50 479.00 872.50 1438.00 7228.80
1969 1928.00 1276.50 1078.00 407.00 276.00 164.00 9.00 6.50 136.00 727.50 795.50 1101.02 a 7905.02
1970 1392.42 a 931.84 c 1016.50 757.00 272.50 54.64 b 5.00 10.50 296.67 c 607.50 974.50 1332.00 7651.07
1971 1469.50 1101.50 923.50 582.50 274.50 73.50 24.00 6.50 265.00 595.50 837.50 1460.00 7613.50
1972 1599.27 c 1124.50 752.50 561.50 290.50 36.50 71.50 5.50 291.50 606.50 898.50 1464.50 7702.77
1973 1316.00 1003.00 786.00 671.50 308.34 c 85.00 15.00 3.00 216.00 447.50 1069.66 a 1105.00 7025.99
1974 1356.00 843.50 808.50 466.00 403.50 92.00 1.00 59.00 265.50 438.50 882.00 1105.00 6720.50
1975 1277.50 1393.50 1008.00 792.00 395.50 135.00 0.00 42.00 206.25 b 563.00 1021.20 e 1180.50 8014.45
1976 1217.50 917.00 1031.00 534.50 284.50 169.50 7.00 22.73 a 235.71 b 693.00 910.18 b 1117.00 7139.63
1977 1431.74 d 791.00 920.50 507.41 a 274.87 a 42.00 30.50 68.00 269.00 544.00 1041.00 1408.43 a 7328.46
1978 1798.00 1430.50 1038.50 536.00 351.00 141.96 b 71.82 a 79.50 229.00 570.00 1238.00 1591.50 9075.78
1979 1957.50 1432.50 1015.00 701.90 a 416.43 a 116.79 b 14.50 39.00 160.50 498.50 1059.00 1141.00 8552.62
1980 1583.00 1148.00 1065.00 477.50 252.00 111.00 8.50 103.00 236.38 a 587.00 803.00 1208.50 7582.88
1981 995.00 990.50 779.43 c 498.10 a 360.50 151.00 17.10 b 4.13 a 201.35 d 705.25 c 821.00 1256.02 a 6779.38
1982 1773.72 a 1174.00 1051.50 733.50 429.50 188.00 42.00 17.00 297.00 617.50 1056.50 1266.50 8646.72
1983 1080.00 856.50 839.00 669.50 422.50 145.00 39.50 5.50 298.50 548.00 900.50 1935.50 7740.00
1984 1178.50 848.00 845.50 631.50 372.00 a 157.50 7.00 7.00 376.00 697.00 992.00 1600.00 7712.00
1985 1496.50 1274.50 996.00 475.50 211.50 164.00 18.50 81.63 a 385.50 628.00 1492.00 1353.00 8576.63
1986 975.00 1236.00 629.00 615.52 a 386.00 20.50 26.00 25.00 364.50 525.50 1119.83 a 1076.50 6999.34
1987 1163.00 870.00 850.43 a 399.50 208.50 76.00 64.21 c 94.00 212.50 594.00 812.00 1117.07 b 6461.22
1988 1412.00 1126.00 795.00 542.50 240.00 31.50 8.50 38.50 282.00 489.00 909.00 1157.00 7031.00
1989 1311.00 1480.50 1211.00 600.50 356.00 139.50 4.50 54.00 248.00 611.00 830.50 1304.00 8150.50
1990 1101.50 1113.50 892.50 569.50 403.50 135.50 20.00 6.00 130.00 586.50 777.50 1493.50 7229.50
1991 1486.00 724.50 888.00 624.00 321.00 72.50 14.00 5.00 218.00 655.00 1012.00 1062.50 7082.50
1992 1046.50 836.00 693.00 531.50 269.00 100.50 84.50 0.00 z 240.50 549.00 960.00 1443.57 a 6754.07
1993 0.00 z 0.00 z 0.00 z 0.00 z 240.50 144.00 133.50 102.50 315.50 611.00 1056.00 1088.00 3691.00
1994 1294.50 1300.00 769.50 557.00 214.00 111.00 23.50 20.00 139.50 601.50 1033.00 1191.00 7254.50
1995 1120.00 891.00 1035.00 680.50 445.00 137.00 30.50 29.00 236.50 588.00 0.00 z 0.00 z 5192.50
1996 0.00 z 392.50 t 618.00 p 247.00 n 193.50 p 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1997 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 47.53 a 38.00 152.00 549.50 941.00 1138.00 2866.03
1998 1343.50 825.00 1023.50 505.00 275.00 203.50 0.00 1.00 98.50 517.00 849.00 1225.00 6866.00
1999 1189.50 782.50 771.50 622.00 352.50 113.50 43.50 9.50 288.50 541.50 678.00 942.50 6335.00
2000 1234.00 1019.00 754.00 526.50 0.00 z 121.00 0.50 24.00 229.50 581.00 1187.00 1510.50 7187.00
2001 1118.00 1289.00 802.50 388.00 245.50 122.50 0.00 7.00 145.50 595.50 790.00 1232.50 6736.00
2002 1158.00 931.00 1254.50 702.50 400.00 104.50 0.50 63.50 202.00 747.00 809.00 1161.00 7533.50
2003 0.00 z 1078.50 996.00 472.00 356.00 130.00 0.00 17.50 259.50 420.00 1114.00 1159.00 6002.50
2004 1457.00 1037.00 744.00 485.50 386.50 180.00 19.00 54.50 249.50 583.00 847.50 1060.50 7104.00
2005 1463.50 901.50 825.50 0.00 z 401.00 147.00 26.50 81.00 226.00 0.00 z 810.00 1311.00 6193.00
2006 919.00 1049.00 967.50 487.50 288.50 45.50 0.00 19.50 250.50 680.00 972.00 1131.00 6810.00
2007 1271.50 1152.00 686.50 643.00 271.50 92.50 3.50 23.50 193.50 517.00 871.00 1206.00 6931.50
2008 1365.00 1034.50 895.00 688.00 358.50 138.50 13.00 17.50 272.00 583.00 749.50 1506.50 7621.00
2009 1190.00 913.50 1002.00 608.50 332.00 180.00 25.00 39.00 132.00 805.00 839.50 1570.50 7637.00
2010 1407.50 1227.00 711.00 565.50 417.50 92.50 15.00 33.50 197.50 370.00 998.50 1282.00 7317.50
2011 1214.54 c 894.50 h 894.02 c 614.00 401.93 b 100.50 0.00 0.52 a 121.15 d 437.00 927.50 1025.50 5736.65
2012 1167.50 1031.00 636.00 460.71 b 345.13 a 53.50 0.00 25.50 139.00 630.00 845.00 1230.50 6563.85
2013 1221.00 918.00 918.12 a 49.50 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 45.50 z 3057.12
Period of Record Statistics
MEAN 1370.65 1107.97 953.60 586.46 327.31 116.76 20.93 37.33 237.27 563.39 942.31 1273.50 7565.82
S.D. 264.64 219.05 167.48 101.22 77.50 50.26 22.86 26.43 79.67 111.47 145.47 193.09 635.81
SKEW 0.75 0.66 0.48 -0.24 -0.20 0.06 2.05 0.60 0.47 0.67 0.59 0.66 0.26
MAX 2147.00 1968.50 1428.50 814.50 468.50 240.50 133.50 104.00 512.50 922.00 1492.00 1935.50 9075.78
MIN 919.00 724.50 629.00 328.50 138.95 10.00 0.00 0.52 48.00 329.00 610.00 939.00 6335.00
NO YRS 98 99 100 98 99 100 101 100 101 100 100 100 92