CHARLESTON, ILLINOIS

Monthly Total Heating Degree Days

(111436)

Base Temperature = 65 F

File last updated on Oct 29, 2012
*** Note *** Provisional Data *** After Year/Month 201210
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 952.50 910.88 a 224.50 10.50 6.50 0.00 9.50 129.50 422.50 669.50 891.00 4226.88
1897 1235.50 927.00 718.50 431.00 227.00 23.50 1.00 5.50 38.50 164.50 685.50 1087.00 5544.50
1898 1000.50 903.00 621.50 443.00 98.50 0.00 0.00 0.00 21.50 401.00 781.50 1124.50 5395.00
1899 1156.50 1243.00 908.00 345.00 94.00 3.00 0.00 0.00 132.00 187.50 521.50 1062.50 5653.00
1900 992.50 1096.00 877.00 322.00 97.50 6.00 0.00 z 0.00 45.00 132.50 667.50 1004.00 5240.00
1901 1040.00 1090.00 722.30 a 0.00 z 155.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 808.50 1199.70 a 5015.50
1902 1118.00 1244.00 644.50 457.50 55.00 12.93 a 4.50 6.00 86.50 208.00 412.00 1075.70 a 5324.63
1903 1142.50 1003.50 546.50 388.97 a 83.00 30.00 0.00 3.74 b 89.00 312.50 754.00 1213.00 5566.71
1904 1318.50 1160.50 734.00 508.50 111.00 2.00 3.50 5.00 39.50 312.00 652.50 1045.00 5892.00
1905 1304.50 1217.50 551.00 357.50 76.00 2.07 a 0.00 0.00 15.00 325.50 655.00 1002.50 5506.57
1906 908.00 1019.50 1032.82 a 264.50 121.50 19.50 0.00 4.00 11.50 328.00 718.50 943.50 5371.32
1907 953.50 947.00 511.00 634.00 262.50 41.00 0.50 2.00 90.52 a 376.00 769.50 943.00 5530.52
1908 1045.00 1021.00 561.00 360.50 148.00 26.00 0.52 a 0.00 47.50 334.00 609.83 a 945.50 a 5098.84
1909 1020.00 819.50 737.50 386.50 169.50 6.50 0.00 0.00 114.50 426.00 386.50 1269.00 5335.50
1910 1106.50 1027.50 414.00 372.50 228.50 65.50 0.00 15.50 a 42.00 266.00 790.00 1163.50 5491.50
1911 1004.00 800.00 700.00 417.00 103.85 a 0.00 3.00 12.00 29.00 331.00 820.00 890.50 5110.35
1912 1490.00 1186.00 1010.50 294.00 91.50 25.86 a 0.00 13.00 99.00 270.98 b 669.31 a 911.40 a 6061.56
1913 965.77 e 1043.78 a 773.45 a 379.00 84.22 a 21.21 a 0.00 0.00 z 0.00 z 337.00 f 493.97 a 853.50 4614.89
1914 911.50 1168.50 800.00 380.69 a 102.50 4.50 0.00 0.00 63.50 242.00 591.00 1230.59 c 5494.78
1915 1235.50 750.00 884.00 254.48 a 159.65 a 16.00 2.00 g 44.50 55.50 233.61 c 561.00 1054.52 a 5248.76
1916 997.50 1031.50 767.50 428.00 99.50 13.00 0.00 3.50 111.00 320.00 573.50 1093.00 5438.00
1917 1037.50 1053.00 654.00 411.50 303.44 e 42.00 0.00 14.00 69.00 549.50 646.50 1313.00 6093.44
1918 1598.50 905.00 594.54 c 522.69 d 47.05 c 7.50 3.00 0.00 176.00 212.50 662.50 779.81 b 5509.09
1919 983.00 890.96 c 645.00 324.00 193.00 0.00 0.00 1.00 17.00 219.50 698.00 1200.22 a 5171.68
1920 1295.50 970.00 681.00 516.00 152.00 18.50 0.00 12.50 32.50 191.68 a 702.50 980.00 5552.18
1921 934.50 757.00 415.50 292.50 b 143.50 3.50 0.00 0.50 10.00 273.50 619.00 903.00 4352.50
1922 1205.00 867.50 631.50 297.50 43.50 2.00 1.50 0.50 34.00 234.50 590.17 a 969.50 4877.17
1923 924.00 1048.00 756.50 407.59 a 161.50 23.50 1.03 a 11.00 56.50 409.50 611.50 705.50 5116.12
1924 1309.50 984.50 867.00 305.69 a 263.50 23.50 15.50 2.00 139.50 145.38 b 632.00 1165.50 5853.57
1925 1151.50 742.50 628.50 210.00 205.00 0.00 0.50 0.00 8.50 570.00 725.50 1092.00 5334.00
1926 1075.00 827.00 618.50 n 547.50 93.50 28.50 2.50 0.00 70.00 328.00 783.00 1086.00 4841.00
1927 1194.07 d 698.96 a 608.50 343.97 a 141.50 36.00 0.50 15.00 52.00 185.00 530.50 1074.50 4880.50
1928 1075.00 889.00 703.00 486.72 a 106.43 a 50.50 0.00 0.00 71.50 f 259.00 617.50 918.00 5105.16
1929 1239.00 1082.50 491.35 a 282.50 213.00 31.50 0.00 c 1.60 b 76.55 a 309.50 787.00 1048.00 5562.51
1930 1284.50 645.50 750.50 283.00 82.00 26.00 0.50 0.00 28.00 368.56 d 612.41 a 1004.50 5085.47
1931 955.50 729.50 840.00 330.00 194.00 24.00 0.00 0.00 24.50 197.00 375.00 736.50 4406.00
1932 840.50 695.00 898.00 314.00 103.50 0.00 0.00 0.52 a 43.50 273.00 818.00 1002.00 4988.02
1933 782.50 929.00 700.00 347.50 79.50 12.50 0.00 0.00 5.00 295.00 676.50 855.50 4683.00
1934 928.50 1064.00 802.00 335.00 46.00 0.00 0.00 7.00 55.00 179.00 528.00 1088.00 5032.50
1935 1037.47 a 829.50 495.00 438.50 217.00 32.50 0.00 14.00 64.00 280.00 679.00 1204.00 5290.97
1936 1327.50 1237.00 586.93 a 478.00 68.50 5.00 0.00 0.00 51.00 300.50 756.00 913.00 5723.43
1937 1055.50 960.50 810.00 390.00 125.50 20.00 3.50 0.00 110.50 390.50 767.00 1108.50 5741.50
1938 1111.50 698.00 490.50 325.00 138.50 5.00 0.00 0.00 66.72 a 211.00 599.50 985.00 4630.72
1939 917.00 931.00 654.00 455.50 81.00 12.00 0.00 0.00 27.00 255.00 672.50 885.50 4890.50
1940 1511.00 955.00 775.50 405.50 188.50 4.00 2.00 3.50 93.50 183.00 715.50 858.00 5695.00
1941 1019.00 1006.00 857.00 246.50 77.00 1.00 0.00 0.00 38.50 203.50 604.00 821.00 4873.50
1942 1083.00 988.00 586.00 248.00 136.50 22.00 0.00 7.00 140.00 237.50 561.00 1132.00 5141.00
1943 1073.50 798.00 829.50 396.50 113.50 7.50 0.00 0.50 98.50 284.50 738.50 1091.50 5432.00
1944 949.50 867.50 809.00 403.00 94.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 439.00 m 1199.91 b 4323.41
1945 1231.50 874.00 411.00 325.50 238.50 58.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 3139.00
1946 428.00 t 804.50 324.00 282.50 154.50 27.00 0.00 14.50 41.50 166.00 558.50 868.00 3241.00
1947 969.50 1105.50 925.00 360.50 183.00 37.50 16.50 0.00 96.00 102.00 799.00 948.00 5542.50
1948 1269.50 938.00 689.50 267.50 124.50 1.55 a 0.00 b 1.00 41.50 351.33 a 565.00 894.19 b 5143.57
1949 1009.50 819.00 697.00 362.14 b 62.00 b 1.50 f 0.00 b 4.77 e 110.50 203.57 a 591.00 841.28 b 4700.75
1950 772.70 d 885.77 b 773.00 510.00 a 44.20 d 6.35 d 0.00 c 6.89 d 16.00 m 172.50 726.60 e 1300.50 5198.51
1951 1047.00 891.50 668.50 f 443.08 d 0.00 z 13.50 f 0.00 c 1.50 f 78.46 d 251.21 b 845.89 b 1046.50 4603.64
1952 970.00 790.50 752.50 364.00 115.70 c 0.00 0.00 e 1.72 d 15.00 u 457.85 e 665.36 b 928.50 5046.12
1953 954.00 771.00 669.00 451.20 e 108.50 c 1.67 c 0.00 l 0.00 c 42.12 d 196.00 600.50 965.50 4759.48
1954 1043.50 744.59 a 846.00 261.43 b 252.98 c 21.50 0.00 3.50 32.00 318.00 669.50 1012.50 5205.50
1955 1143.38 a 957.50 765.50 207.50 84.00 57.50 0.00 0.00 24.81 d 286.48 b 811.00 1153.00 5490.67
1956 1192.50 954.50 759.00 441.50 122.50 23.00 0.00 9.50 76.50 134.50 710.69 a 847.00 5271.19
1957 1269.50 778.50 736.25 a 366.50 129.17 a 5.00 0.00 3.50 93.50 424.00 720.00 862.32 a 5388.23
1958 1140.05 b 1127.50 896.93 a 376.50 128.50 31.50 1.50 6.50 76.00 306.26 b 589.50 1207.00 5887.74
1959 1269.50 924.50 723.50 369.31 a 87.50 8.40 e 0.00 f 0.00 53.28 a 347.50 872.50 880.00 5535.99
1960 1098.43 a 1080.50 1268.93 a 285.00 b 180.50 5.00 0.00 0.00 13.50 238.00 621.00 1171.00 5961.87
1961 1187.00 795.93 a 611.00 489.00 199.50 20.50 0.00 3.50 45.00 231.00 632.68 b 1067.00 5282.10
1962 1305.00 860.00 818.00 397.00 16.50 3.00 0.00 0.00 77.50 213.00 631.00 1136.00 5457.00
1963 1388.50 1124.50 563.50 237.50 116.00 6.50 2.50 13.50 31.50 72.50 533.50 1375.50 5465.50
1964 990.00 962.50 726.00 276.00 44.00 8.00 1.50 3.50 60.00 323.50 517.50 1028.00 4940.50
1965 1075.50 921.50 958.50 282.50 25.00 0.00 0.00 6.00 43.00 286.00 513.50 770.50 4882.00
1966 1263.50 927.50 644.00 407.00 196.50 7.50 0.00 1.00 72.00 338.50 592.50 986.50 5436.50
1967 994.00 993.48 a 616.50 272.00 215.00 7.50 4.00 18.00 87.00 330.00 739.00 958.00 5234.48
1968 1200.00 1075.50 615.50 309.50 166.00 8.50 0.50 8.50 23.50 315.00 654.00 1039.00 5415.50
1969 1201.00 883.50 866.50 288.00 95.00 29.50 0.00 0.00 53.00 304.32 a 747.50 1101.00 5569.32
1970 1369.00 978.50 794.00 301.00 56.50 24.00 1.00 0.00 2.00 s 303.36 c 698.00 912.50 5437.86
1971 1255.00 968.50 798.77 a 350.50 128.17 e 0.00 3.50 3.00 54.00 126.14 b 619.50 588.50 h 4307.08
1972 1152.50 973.00 702.50 357.50 78.50 36.00 7.00 3.00 43.00 382.50 750.00 1056.00 5541.50
1973 1035.00 867.00 449.00 377.00 101.00 g 0.00 0.00 0.00 19.50 165.00 561.43 b 891.00 f 3473.93
1974 1073.12 a 831.50 582.50 261.50 120.00 25.50 0.00 0.00 158.28 a 311.00 660.00 955.50 4978.89
1975 1010.00 960.81 a 817.50 400.00 68.00 7.50 5.00 0.00 130.00 223.72 a 525.00 a 966.50 5114.03
1976 1242.67 b 711.00 547.50 308.00 186.00 5.00 0.00 0.00 74.00 480.50 878.00 1182.50 5615.17
1977 1612.52 a 984.00 539.40 a 233.00 40.00 23.00 0.00 0.00 21.00 360.00 642.00 1135.00 5589.92
1978 1467.50 1284.50 925.50 309.50 189.50 2.50 0.50 0.50 25.50 329.50 539.50 984.00 6058.50
1979 1513.00 1254.50 678.50 404.00 151.90 a 3.00 0.00 9.00 46.50 304.32 a 680.00 878.00 5922.72
1980 1134.00 1179.50 847.50 413.50 92.00 16.50 0.00 0.00 35.17 a 397.00 687.41 a 983.00 5785.59
1981 1215.50 882.00 721.50 216.50 214.50 0.00 1.00 2.00 75.50 317.00 584.00 1116.00 e 5345.50
1982 1412.50 1088.50 704.00 489.00 15.00 28.50 0.50 3.50 67.00 300.50 603.00 764.50 5476.50
1983 1077.50 802.00 704.50 488.00 168.50 15.50 2.50 0.00 74.00 243.50 553.00 1398.00 5527.00
1984 1284.50 780.50 951.00 417.50 154.00 0.00 0.00 0.00 114.00 158.00 675.00 792.00 5326.50
1985 1371.50 1046.00 584.00 235.00 67.00 23.00 0.00 1.00 92.00 208.00 568.00 1287.00 5482.50
1986 1038.00 919.50 589.00 241.50 80.50 2.00 0.00 20.00 13.00 276.00 749.50 985.50 4914.50
1987 1160.00 785.50 562.50 331.50 31.00 0.00 0.00 1.50 31.50 439.00 537.00 923.50 4803.00
1988 1194.00 1082.50 693.00 329.50 58.00 10.50 0.00 5.50 23.00 458.00 605.00 1007.50 5466.50
1989 853.00 1094.00 676.00 392.50 214.50 7.50 0.00 4.50 105.00 228.50 660.00 1415.50 5651.00
1990 812.50 756.50 571.50 411.00 148.50 15.50 7.50 5.00 60.50 351.00 490.00 1009.50 4639.00
1991 1225.50 812.00 620.00 232.00 55.50 0.00 0.00 0.00 109.00 234.50 764.50 888.50 4941.50
1992 1006.50 750.00 619.00 330.50 155.50 18.50 0.00 13.00 83.00 308.50 634.00 992.00 4910.50
1993 1096.50 1031.50 806.50 415.50 87.50 26.50 0.00 0.00 103.50 367.00 699.50 996.50 5630.50
1994 1332.48 a 1001.00 680.45 a 329.00 184.50 5.50 0.00 4.00 55.00 254.00 494.50 819.50 5159.93
1995 1086.50 952.50 597.50 331.00 120.50 4.50 0.00 0.00 88.50 227.00 822.00 1118.00 5348.00
1996 1239.00 944.00 890.00 431.00 118.00 8.50 0.00 0.00 83.50 272.50 835.00 961.00 5782.50
1997 1264.50 817.50 619.50 461.00 216.00 17.50 0.00 4.00 37.50 336.50 760.00 986.50 5520.50
1998 923.00 652.50 715.50 310.00 38.50 36.50 0.00 0.00 9.50 233.00 549.00 900.50 4368.00
1999 1117.03 a 758.00 794.00 280.00 50.00 18.50 0.00 0.00 69.50 285.00 460.00 944.47 a 4776.50
2000 1116.00 768.50 583.00 317.00 60.00 14.00 0.00 0.00 a 85.00 218.00 733.00 1420.50 5315.00
2001 1186.27 a 868.00 822.00 200.00 91.50 28.00 1.00 0.00 86.50 305.00 450.50 867.00 4905.77
2002 920.00 832.50 775.00 322.50 169.50 3.50 0.00 0.00 22.00 385.50 727.50 966.00 5124.00
2003 1288.50 1043.00 607.00 271.00 108.50 36.00 0.00 0.00 76.00 278.50 534.00 934.00 5176.50
2004 1205.50 938.00 576.00 295.50 71.50 11.50 0.50 27.50 28.50 269.00 527.00 982.50 4933.00
2005 1069.00 816.50 774.50 280.50 144.00 3.00 0.00 0.00 15.50 306.00 567.50 1132.00 5108.50
2006 754.00 882.00 671.00 211.50 153.50 2.50 0.00 0.00 79.00 411.00 590.50 863.00 4618.00
2007 1019.50 1197.00 445.00 397.50 36.00 0.00 0.00 0.00 25.50 189.00 647.00 0.00 z 3956.50
2008 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 1061.50 1061.50
2009 1286.50 833.00 180.50 r 344.00 86.00 8.89 c 0.00 b 9.00 27.50 415.00 482.50 1031.00 4523.39
2010 1284.00 1049.00 601.00 152.00 84.00 0.00 0.00 0.00 26.50 208.50 586.00 1176.00 5167.00
2011 1232.00 840.52 a 632.40 a 204.00 e 156.60 b 0.00 a 0.00 e 0.00 84.50 266.08 a 493.97 a 834.93 a 4745.00
2012 971.00 786.00 252.59 d 246.50 20.31 b 11.38 a 0.00 0.00 a 62.59 a 207.00 j 0.00 z 0.00 z 2350.37
Period of Record Statistics
MEAN 1129.26 935.30 700.57 350.05 122.37 14.64 0.92 3.93 61.49 285.05 644.51 1019.08 5298.66
S.D. 173.34 145.61 153.56 87.67 62.44 14.30 2.51 6.59 36.31 91.27 106.99 148.95 384.02
SKEW 0.36 0.31 0.18 0.36 0.45 1.18 4.46 3.01 0.67 0.44 -0.05 0.52 -0.27
MAX 1612.52 1284.50 1268.93 634.00 303.44 65.50 16.50 44.50 176.00 570.00 878.00 1420.50 6093.44
MIN 754.00 645.50 252.59 152.00 10.50 0.00 0.00 0.00 5.00 72.50 375.00 705.50 4352.50
NO YRS 114 116 113 115 114 112 109 111 108 111 113 112 94