date! ,

Monthly Total Heating Degree Days

(a vali)

Base Temperature = 65 F

File last updated on Apr 6, 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
1877 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 5.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1878 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
1879 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
1880 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
1881 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
1882 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
1883 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
1884 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
1885 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
1886 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
1887 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
1888 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
1889 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
1890 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
1891 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
1892 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
1893 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
1894 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
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 0.00 z 0.00 z 0.00
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 0.00 z 0.00 z 0.00 z 341.00 x 0.00
1899 773.00 p 1713.00 1559.00 638.50 307.50 43.50 14.00 2.50 z 134.00 x 490.00 676.00 1471.00 6912.50
1900 1403.00 1537.00 1235.50 473.04 b 169.00 34.00 19.50 0.00 210.00 319.00 1170.00 1372.00 7942.04
1901 1477.50 1418.00 1088.50 551.50 252.00 78.50 0.00 a 6.00 259.50 499.50 1037.50 1555.50 8224.00
1902 1454.50 1358.00 964.00 691.00 257.82 a 96.50 1.00 39.00 354.00 482.00 943.50 1638.50 8279.82
1903 1543.50 1407.50 1059.00 674.40 e 251.50 144.50 31.50 66.50 290.00 461.50 1066.50 1518.00 8514.40
1904 1269.50 j 1675.50 1126.85 a 781.50 294.50 a 112.00 26.00 67.50 0.00 z 0.00 z 0.00 z 0.00 z 4083.85
1905 0.00 z 1526.00 c 966.50 247.00 o 364.77 a 58.93 b 27.50 0.50 95.19 d 698.02 a 908.79 a 1303.00 5949.20
1906 1397.00 1323.50 1367.21 b 512.00 315.00 203.28 a 3.50 20.48 c 140.69 a 572.97 b 1028.28 a 1404.00 8287.90
1907 1778.37 a 1280.00 958.00 803.79 a 517.00 103.50 4.13 a 17.50 161.50 537.33 a 928.80 e 1385.50 8475.43
1908 1361.50 1356.50 1153.20 a 525.00 a 314.13 a 132.00 28.00 62.00 119.50 0.00 z 854.50 1366.00 7272.33
1909 1627.50 1328.50 1151.50 840.00 323.00 85.00 31.50 10.50 192.00 572.98 a 277.00 q 0.00 z 6162.48
1910 1655.00 1557.00 588.50 446.50 440.00 130.00 4.50 68.50 187.50 354.50 1059.00 1430.00 7921.00
1911 1716.50 1363.00 873.00 652.00 217.50 20.00 33.50 77.50 187.00 703.00 1380.00 1431.50 8654.50
1912 2068.50 1464.50 1340.00 559.00 290.50 168.50 11.00 22.00 291.00 455.00 836.00 1315.50 8821.50
1913 1541.00 1405.00 1184.50 591.50 347.50 62.50 5.50 5.00 197.00 610.50 764.50 1146.00 7860.50
1914 1329.00 1555.50 230.00 w 623.50 249.50 30.50 8.00 70.00 122.00 365.00 793.50 1666.50 6813.00
1915 1583.00 1156.50 1248.00 320.50 400.00 135.00 61.50 33.00 k 185.00 f 441.50 888.50 1378.00 7612.50
1916 1876.50 1597.00 1115.50 667.50 312.50 167.50 0.00 47.00 213.50 602.50 967.50 1664.50 9231.50
1917 1768.11 c 1581.48 a 1182.50 703.50 382.50 147.41 a 21.18 a 62.00 a 93.50 l 790.50 a 757.50 1818.00 9214.69
1918 1829.00 c 1364.50 779.65 a 672.12 d 169.39 c 40.00 10.50 i 17.71 c 350.50 492.50 988.50 947.00 g 6703.87
1919 1328.00 1409.33 a 1113.50 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 3850.83
1920 0.00 z 1407.50 1147.53 b 865.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 262.00 g 1001.50 1379.50 5801.53
1921 1304.00 1134.00 923.00 467.00 250.00 24.50 4.50 19.00 121.00 419.50 1184.50 1325.50 7176.50
1922 1633.18 a 1571.50 1036.50 565.50 179.00 17.50 15.00 4.50 97.76 a 404.50 883.00 1530.50 7938.44
1923 1445.12 a 1446.67 a 1279.50 645.50 347.00 72.00 2.00 28.50 96.00 581.50 814.50 1097.50 7855.78
1924 1808.00 579.50 o 1094.00 592.00 446.00 74.48 a 17.00 10.00 231.50 299.50 1001.90 a 1796.50 7370.88
1925 1677.50 1161.46 b 973.50 337.50 345.50 69.50 21.00 5.74 d 91.50 850.50 931.00 1399.50 7864.20
1926 1467.00 1080.50 1089.50 634.66 a 153.00 107.50 11.50 5.00 234.00 532.50 1148.50 1548.00 8011.66
1927 1503.00 1196.50 973.50 610.50 360.00 130.00 10.00 43.50 213.00 389.50 1068.50 1793.50 8291.50
1928 1511.50 1246.50 972.50 782.50 176.00 107.00 7.50 27.50 215.00 491.50 953.00 1228.00 7718.50
1929 1936.00 1636.50 971.50 621.00 360.50 88.00 5.50 8.50 268.00 463.50 1116.50 1439.50 8915.00
1930 1859.50 992.50 1012.00 504.00 301.50 47.50 12.00 11.50 161.50 587.00 865.50 1274.50 7629.00
1931 1229.50 911.00 978.57 a 504.00 309.00 29.50 6.00 21.50 77.50 361.00 834.50 1170.50 6432.57
1932 1561.00 1311.98 b 1319.00 554.50 242.00 12.00 7.50 5.50 145.00 559.50 1069.00 1481.50 8268.48
1933 1227.50 1396.50 1010.50 560.00 292.50 8.50 0.00 7.00 71.50 551.50 950.50 1430.00 7506.00
1934 1414.00 1216.00 1090.50 594.00 84.00 23.00 3.00 52.00 284.00 346.00 787.50 1458.50 7352.50
1935 1647.00 1061.50 892.00 679.14 a 370.50 105.00 0.00 36.50 118.50 512.50 1123.50 1435.00 7981.14
1936 1930.50 1974.00 1045.00 732.50 133.50 67.00 0.00 2.00 96.00 552.04 e 1033.00 1344.50 8910.04
1937 1961.00 1431.63 a 1128.83 b 679.50 175.50 107.00 1.00 0.00 164.50 577.00 1038.00 1541.50 8805.46
1938 1602.50 1345.50 883.50 570.50 299.50 42.50 0.00 0.00 94.14 a 302.50 1023.50 1333.50 7497.64
1939 1368.13 a 1555.50 1065.50 638.50 85.50 30.00 0.00 26.00 150.50 542.50 822.32 b 1058.00 7342.45
1940 1870.85 a 1358.50 1215.72 a 673.00 267.00 33.50 3.00 34.50 107.50 308.00 1163.50 1293.50 8328.57
1941 1514.50 1399.50 1172.32 a 493.50 130.50 74.00 16.02 a 15.50 146.79 b 447.00 934.00 1186.50 7530.12
1942 1390.87 a 1269.00 979.50 459.50 357.00 79.66 a 4.98 c 23.77 a 340.38 d 504.00 946.00 1547.50 7902.16
1943 1831.00 1259.00 1268.50 593.00 393.18 a 92.50 9.50 17.00 286.00 471.00 1036.11 c 1309.00 8565.79
1944 1193.00 1334.50 1329.50 742.50 217.00 82.00 3.00 52.50 171.00 506.50 890.50 1453.50 7975.50
1945 1509.70 a 1238.50 870.50 704.00 442.00 178.00 40.50 20.50 242.00 491.50 1064.50 1668.50 8470.20
1946 1578.50 1355.50 776.50 406.03 a 349.50 92.50 6.50 37.00 193.00 550.00 1042.50 1327.50 7715.03
1947 1382.50 1461.50 1180.00 759.50 377.00 116.00 24.00 8.50 207.50 335.50 1157.50 1495.00 8504.50
1948 1741.00 1503.50 1221.00 501.50 290.50 74.00 12.00 28.00 94.00 531.50 976.55 a 1466.00 8439.55
1949 1733.00 1492.50 1171.50 610.00 200.50 39.50 11.50 12.00 287.00 529.00 844.00 1451.00 8381.50
1950 1886.00 1365.78 a 1322.50 886.50 420.00 98.28 a 29.50 91.50 168.00 454.50 1145.89 b 1610.97 a 9479.41
1951 1732.00 1308.00 1476.50 794.50 236.00 147.50 47.50 37.20 a 341.38 a 619.50 1197.00 1637.50 9574.58
1952 1746.50 1261.50 1334.00 591.00 304.50 51.21 a 17.00 25.83 a 190.50 693.50 982.00 1390.00 8587.54
1953 1601.00 1291.00 1116.00 824.50 347.00 66.00 10.85 a 11.00 221.00 350.00 880.50 1457.00 8175.85
1954 1800.50 982.00 1267.50 612.00 465.00 a 71.50 6.00 7.00 179.50 630.00 854.50 1369.00 8244.50
1955 1571.50 1542.00 1259.50 415.50 165.50 96.50 0.00 9.00 204.00 499.62 a 1326.00 1739.00 8828.12
1956 1734.97 a 1592.93 a 1318.50 779.00 287.78 a 30.52 a 15.50 32.50 235.00 351.00 1058.50 1316.50 8752.70
1957 1817.00 1298.00 1150.50 669.50 367.00 77.00 1.55 a 34.10 a 278.50 577.00 1011.50 1214.50 8496.15
1958 1362.00 1434.50 1122.50 634.50 220.00 164.50 29.00 29.50 150.50 466.00 961.50 1568.50 8143.00
1959 1757.50 1508.50 1026.00 673.00 291.50 46.00 24.50 1.50 227.00 741.00 1304.50 1174.00 8775.00
1960 1665.50 1504.50 1585.50 667.00 325.50 84.50 24.50 16.50 229.50 502.50 938.50 1501.50 9045.50
1961 1679.00 1265.50 986.50 813.50 411.50 82.00 4.50 16.00 267.50 513.00 1024.50 1594.00 8657.50
1962 1740.00 1391.50 1331.50 740.50 191.50 74.50 37.50 10.50 260.50 443.50 858.50 1388.00 8468.00
1963 1917.50 1413.50 948.50 553.00 303.50 21.50 2.00 29.50 125.00 245.00 838.50 1687.50 8085.00
1964 1388.50 1230.00 1317.50 615.50 217.50 70.00 1.50 97.50 249.00 561.00 984.00 1655.00 8387.00
1965 1773.50 1548.00 1530.00 710.50 225.50 44.00 8.50 55.00 447.00 460.50 1022.00 1206.50 9031.00
1966 1906.00 1440.00 946.50 781.50 399.50 76.50 2.50 63.00 200.00 617.00 1118.79 a 1504.00 9055.29
1967 1541.50 1548.50 999.00 652.50 466.00 69.00 66.00 69.00 205.50 642.00 1076.50 1438.00 8773.50
1968 1663.00 1452.00 888.00 584.50 437.00 95.00 35.50 41.00 193.50 487.00 950.50 1539.50 8366.50
1969 1805.00 1302.50 1414.50 544.50 225.50 158.00 9.50 9.50 130.00 645.00 970.00 1430.00 8644.00
1970 1908.00 1320.00 1237.50 615.00 210.00 51.00 14.00 10.00 191.50 561.00 1039.50 1515.50 8673.00
1971 1773.50 1317.50 1070.00 508.50 297.50 12.00 45.50 12.00 184.00 398.50 960.00 1505.00 8084.00
1972 1815.00 1551.00 1089.50 626.50 217.00 46.50 26.00 51.00 198.00 605.00 1008.00 1590.50 8824.00
1973 1483.87 a 1203.50 811.50 604.00 284.00 37.50 13.50 3.00 198.00 336.50 0.00 z 1586.00 6561.37
1974 1753.00 1356.00 1055.00 579.00 374.50 100.50 6.00 64.00 319.66 a 545.50 993.00 1349.02 a 8495.17
1975 1552.38 e 1501.50 1404.09 b 849.50 217.00 a 102.50 17.50 15.50 314.50 505.00 957.41 a 1514.19 b 8951.07
1976 1744.78 a 1172.00 1083.89 c 483.62 a 321.50 56.00 8.50 13.00 229.50 876.35 e 1216.50 1664.24 d 8869.88
1977 2013.93 b 1226.50 926.79 b 379.29 b 34.00 15.00 3.50 57.00 166.00 576.08 a 1073.08 d 1572.98 b 8044.15
1978 1967.31 e 1618.50 1060.95 b 624.50 257.00 79.62 d 17.50 24.59 b 130.50 386.00 g 1037.14 b 1598.80 d 8416.40
1979 2033.27 c 1636.92 b 1217.78 a 677.50 355.00 48.00 6.00 65.00 147.00 569.00 1057.50 1213.98 c 9026.96
1980 1513.26 d 1437.00 1102.50 516.50 226.82 a 17.78 c 11.22 b 21.00 152.50 643.52 b 853.00 1339.09 c 7834.18
1981 1370.72 a 1127.50 872.00 369.50 242.50 34.00 17.50 39.50 0.00 z 593.00 0.00 z 1541.70 c 6207.91
1982 1982.45 a 1344.00 1060.00 651.50 229.00 179.50 17.00 58.50 259.00 606.00 1169.00 1346.43 a 8902.38
1983 1546.12 c 1209.50 1097.50 805.50 406.50 129.50 3.00 0.00 256.00 623.00 1007.50 2100.00 9184.12
1984 1693.50 1171.00 1391.50 658.50 403.50 56.00 26.00 26.00 390.00 0.00 z 1059.50 1539.00 8414.50
1985 1760.00 1435.50 927.00 467.00 161.00 136.50 22.00 87.50 327.00 665.00 1344.50 1828.50 9161.50
1986 1512.00 1465.50 1008.00 555.50 252.50 37.00 10.00 96.00 252.50 604.00 1227.50 1325.00 8345.50
1987 1445.00 992.50 997.50 478.50 167.00 62.00 15.50 124.00 256.00 707.50 862.00 1347.50 7455.00
1988 1870.00 1626.00 1011.00 651.50 101.50 11.00 8.50 36.00 176.00 722.00 1007.00 1442.00 8662.50
1989 1338.50 1620.89 a 1197.50 606.00 262.50 107.50 7.50 22.50 250.50 552.00 1116.00 1750.50 8831.89
1990 1234.50 1248.50 980.00 644.00 327.50 61.00 38.50 31.50 168.00 605.50 943.50 1607.50 7890.00
1991 1736.00 1097.00 971.00 516.00 255.50 27.50 30.00 36.50 232.00 636.50 1264.50 1314.50 8117.00
1992 1297.00 1130.00 959.50 757.00 208.00 76.00 99.00 101.50 224.50 580.00 1106.00 1512.00 8050.50
1993 1715.50 1512.00 1247.00 688.97 a 323.00 130.50 13.50 36.50 345.00 639.50 1139.50 1461.00 9251.96
1994 1955.50 1620.50 984.50 648.00 209.50 25.50 30.50 57.50 168.50 491.00 926.50 1368.50 8486.00
1995 1567.50 1291.50 1053.00 799.00 359.00 81.00 23.50 11.50 245.00 608.50 1204.00 1424.50 8668.00
1996 1795.50 1391.00 1309.50 732.00 413.50 59.00 21.50 10.00 260.50 554.00 1322.50 1741.50 9610.50
1997 1864.00 1352.00 1207.50 746.00 437.00 7.50 22.00 46.00 146.00 520.50 1173.50 1261.00 8783.00
1998 1506.50 974.50 1203.00 568.50 125.50 121.00 3.00 1.00 84.50 461.50 944.00 1294.00 7287.00
1999 1694.67 a 1060.89 a 1007.00 579.50 220.00 78.50 6.00 12.00 222.50 582.69 d 738.00 1299.42 a 7501.16
2000 1597.61 c 1094.50 805.50 620.50 210.00 96.50 29.00 10.50 198.00 461.50 1184.00 1860.53 b 8168.14
2001 1517.93 b 1613.77 b 1276.00 567.50 230.50 76.50 9.00 20.50 185.50 596.50 666.50 1281.16 b 8041.36
2002 1379.00 1115.50 1413.50 644.50 411.00 46.00 7.50 30.00 184.50 797.00 1064.50 1285.00 8378.00
2003 1592.00 1427.50 1119.50 574.00 317.00 88.50 3.00 16.00 242.50 502.50 1102.00 1323.50 8308.00
2004 1652.50 1429.00 913.00 546.00 333.50 123.00 29.50 113.50 114.50 519.00 875.50 1340.50 7989.50
2005 1645.07 a 1126.00 1095.00 470.00 326.50 16.50 20.50 25.00 98.50 506.50 905.00 1584.62 a 7819.18
2006 1200.00 1313.50 1083.00 489.50 284.50 41.00 5.00 16.00 289.00 649.00 974.00 0.00 z 6344.50
2007 1519.00 1554.50 961.00 696.00 150.50 43.50 9.00 18.00 171.50 449.50 1004.00 1638.50 8215.00
2008 1770.50 1594.00 1223.00 752.50 357.50 51.00 11.00 17.00 197.00 586.50 1009.50 1713.00 9282.50
2009 1811.50 1295.50 1109.00 688.50 295.50 126.00 47.00 68.00 116.50 807.00 787.50 1622.85 a 8774.85
2010 1799.50 1516.00 943.50 424.50 342.50 56.00 0.00 9.00 206.50 474.00 995.50 1657.98 a 8424.98
2011 1871.50 1482.50 1251.00 690.50 315.34 b 81.00 0.00 18.00 260.50 472.00 971.38 a 1274.10 a 8687.82
2012 1387.25 a 1226.00 674.77 a 461.54 d 186.00 36.21 a 0.00 40.00 212.00 693.50 986.00 1413.50 7316.76
2013 1565.00 1386.50 1286.00 39.50 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 4237.50
Period of Record Statistics
MEAN 1634.31 1368.35 1106.70 619.31 286.40 75.98 15.44 31.65 204.21 535.45 1004.89 1463.28 8345.25
S.D. 209.21 183.77 181.60 118.98 94.68 43.79 15.75 27.28 74.31 121.12 142.15 179.83 579.22
SKEW -0.12 -0.06 0.15 -0.10 -0.11 0.60 2.10 1.20 0.50 0.20 0.23 0.48 -0.32
MAX 2068.50 1974.00 1585.50 886.50 517.00 203.28 99.00 124.00 447.00 876.35 1380.00 2100.00 9610.50
MIN 1193.00 911.00 588.50 320.50 34.00 7.50 0.00 0.00 71.50 245.00 666.50 1058.00 6432.57
NO YRS 111 114 114 112 112 112 111 110 107 108 109 109 97