date! ,

Monthly Total Heating Degree Days

(a vali)

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
1936 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
1937 1695.18 a 1409.50 969.78 a 469.00 104.50 31.00 1.03 a 0.00 141.50 542.50 1011.00 1449.50 7824.50
1938 1535.50 1151.00 817.50 534.00 225.00 12.50 0.00 1.50 132.50 348.50 936.50 1243.50 6938.00
1939 1246.20 a 1419.00 998.50 628.50 74.00 19.00 4.00 1.07 b 86.00 401.50 758.50 1011.00 6647.27
1940 1631.00 1159.00 1113.50 546.00 189.10 a 8.50 0.50 35.00 84.00 278.00 947.50 1197.00 7189.10
1941 1312.50 1234.50 1025.50 160.00 l 99.00 52.00 1.50 11.50 74.00 359.50 768.00 1111.00 6049.00
1942 1358.00 0.00 z 879.00 91.00 o 265.50 30.50 2.00 14.00 213.50 411.00 858.50 1456.50 5488.50
1943 1666.77 a 1248.15 b 1203.50 268.50 n 278.48 a 27.50 1.50 7.50 189.00 456.00 985.50 1233.50 7297.40
1944 1172.50 1191.50 1173.19 b 260.00 o 153.00 27.00 2.00 9.50 72.50 374.00 0.00 z 0.00 z 4175.19
1945 0.00 z 0.00 z 0.00 z 319.00 n 341.00 130.00 12.50 19.00 201.00 442.00 0.00 z 0.00 z 1145.50
1946 0.00 z 0.00 z 0.00 z 145.50 n 277.50 72.50 0.00 23.00 156.00 339.00 0.00 z 0.00 z 868.00
1947 0.00 z 0.00 z 0.00 z 242.00 q 373.50 102.93 a 10.85 a 2.07 a 163.00 188.58 a 0.00 z 0.00 z 840.93
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 9.00 o 2.00 8.50 69.50 471.00 0.00 z 0.00 z 551.00
1949 0.00 z 0.00 z 0.00 z 510.50 144.50 11.50 0.00 20.50 218.50 360.00 812.68 b 0.00 z 2078.18
1950 1531.50 1270.00 1176.50 735.50 244.50 43.00 14.50 56.50 145.00 284.50 1000.50 1595.98 a 8097.98
1951 1667.28 a 1284.50 1240.50 681.00 116.50 57.00 3.50 27.50 222.00 471.50 1136.50 1405.00 8312.78
1952 1472.00 1140.00 1125.30 a 505.00 230.00 18.00 3.50 11.00 139.00 285.50 p 0.00 z 1232.77 a 5876.57
1953 1374.85 a 1218.50 989.50 682.00 213.38 a 29.00 0.00 1.00 138.50 305.00 760.00 1202.50 6914.23
1954 1536.50 902.50 1043.00 0.00 z 0.00 z 49.50 0.00 11.50 142.00 508.00 806.00 0.00 z 4999.00
1955 1484.38 a 1313.41 a 1137.00 358.00 153.50 54.00 0.00 3.00 142.00 440.50 1079.00 1555.50 7720.29
1956 1558.00 1415.50 1207.50 683.50 198.50 h 15.00 5.00 18.00 191.50 255.00 894.50 1212.50 7456.00
1957 1607.50 1125.00 1011.63 a 514.00 246.00 28.50 0.00 b 25.50 188.00 527.00 914.50 1199.50 7387.13
1958 1346.50 1341.93 a 982.00 495.00 164.30 a 83.00 6.95 b 31.00 105.50 353.50 824.00 1142.00 i 5733.67
1959 1338.00 f 1389.00 1085.00 519.00 143.00 23.00 8.50 0.50 148.50 588.00 1137.50 1059.50 6101.50
1960 1336.50 1233.00 1319.00 512.50 200.50 51.21 a 4.50 5.00 158.50 438.50 787.50 1342.50 7389.21
1961 1499.00 1068.50 955.00 712.00 283.00 23.00 0.50 0.00 185.50 387.00 882.50 1414.00 7410.00
1962 1596.00 1335.50 1120.00 599.50 143.50 47.00 7.50 7.00 198.50 366.50 854.50 1350.50 7626.00
1963 1834.00 1393.50 932.00 488.50 268.00 30.50 1.50 33.50 112.50 166.50 730.00 1603.00 7593.50
1964 1280.50 1100.50 1041.50 494.00 111.50 52.50 1.50 41.00 171.50 470.00 805.50 1468.88 a 7038.88
1965 1627.50 1395.00 1291.00 643.50 123.50 21.00 4.50 41.00 241.50 411.00 855.00 1083.50 7738.00
1966 1782.50 1294.00 880.00 613.50 325.00 30.00 2.14 b 19.50 147.00 460.50 905.50 1336.00 7795.64
1967 1424.00 1465.00 1002.50 540.50 344.50 16.00 26.00 40.50 165.50 486.50 949.00 1242.00 7702.00
1968 1453.50 1340.00 776.50 438.00 283.00 53.00 10.00 25.00 115.50 403.00 854.50 1374.50 7126.50
1969 1634.50 1243.50 1224.00 470.00 186.50 129.50 6.00 0.00 143.50 543.00 908.50 1315.00 7804.00
1970 1752.50 1257.00 1098.50 525.50 214.50 31.50 3.50 5.50 159.50 411.00 901.50 1403.50 7764.00
1971 1746.00 1326.00 1142.00 526.00 292.50 17.50 16.50 20.00 135.00 270.00 855.00 1277.50 7624.00
1972 1684.00 1436.50 1159.50 682.00 168.00 64.00 27.00 24.00 127.50 541.50 898.50 1515.00 8327.50
1973 1413.50 1152.50 737.50 587.00 283.00 7.50 0.00 6.50 131.50 267.00 836.50 1417.50 6840.00
1974 1487.00 1285.00 991.00 473.50 287.00 49.00 0.00 20.00 232.50 424.50 837.50 1197.00 7284.00
1975 1493.50 1308.50 1237.00 716.00 155.00 43.00 14.50 2.50 235.00 378.00 776.50 1286.00 7645.50
1976 1586.00 1056.50 946.50 448.00 253.50 6.50 1.00 24.00 187.00 623.50 1092.50 1634.50 7859.50
1977 1933.50 0.00 z 805.00 330.50 67.50 33.00 0.50 35.50 129.00 574.00 1011.50 1538.50 6458.50
1978 1872.50 1569.00 1155.50 577.00 218.50 42.50 4.00 13.50 74.50 432.50 936.50 1473.50 8369.50
1979 1957.81 b 1523.50 1084.00 659.00 266.08 a 25.00 3.00 36.00 87.69 d 321.00 m 947.50 1193.50 7783.09
1980 1509.00 1451.00 1171.00 526.00 182.50 41.50 0.00 9.00 138.50 586.00 825.50 1358.00 7798.00
1981 1409.50 1136.00 862.50 430.00 269.00 22.50 28.00 23.00 169.50 527.50 828.00 1410.00 7115.50
1982 1837.50 1331.50 1084.00 645.00 124.50 92.50 5.00 48.50 205.50 494.50 957.93 a 1141.50 7967.93
1983 1335.50 1072.50 937.00 654.00 331.50 55.00 1.50 0.00 192.50 517.00 900.00 1792.00 7788.50
1984 1617.50 1074.00 1205.00 543.00 329.50 8.50 8.50 24.00 243.50 469.50 992.50 1290.00 7805.50
1985 1609.50 1343.50 837.00 395.00 84.50 75.50 0.00 26.50 205.50 453.50 1089.50 1713.50 7833.50
1986 1467.00 1322.50 901.50 406.03 a 155.50 28.00 3.00 36.50 137.50 452.00 1024.50 1247.50 7181.53
1987 1345.00 978.00 839.00 353.00 140.00 9.50 1.50 30.50 109.50 606.00 758.00 1159.00 6329.00
1988 1632.00 1436.54 a 947.64 b 528.50 102.00 11.90 a 1.50 14.50 89.50 611.50 865.50 1309.50 7550.57
1989 1261.00 1442.50 1121.50 574.50 230.50 60.50 0.00 4.00 161.00 387.50 1014.00 1623.76 b 7880.76
1990 1168.50 1134.50 855.50 505.50 283.00 37.50 0.00 z 14.00 194.00 665.00 835.50 1435.50 7128.50
1991 1600.50 1131.50 909.00 460.00 190.00 8.00 9.50 10.50 217.50 494.00 1140.50 1299.50 7470.50
1992 1297.00 1027.50 977.50 627.50 200.50 61.00 28.00 68.00 148.00 493.00 969.50 1361.00 7258.50
1993 1595.50 1324.00 1075.50 648.62 a 224.50 62.50 0.50 12.00 281.50 501.50 960.50 1262.50 7949.12
1994 1828.50 1437.00 938.00 511.50 195.50 25.00 10.00 39.00 89.50 379.50 757.50 1208.50 7419.50
1995 1419.50 1214.50 905.50 652.50 249.50 22.50 9.50 0.00 204.00 481.00 1115.50 1409.50 7683.50
1996 1658.50 1330.50 1190.00 629.50 330.00 47.00 6.00 4.00 147.00 473.50 1099.00 1449.50 8364.50
1997 1596.50 1171.50 1017.50 603.00 360.00 10.00 17.50 28.50 90.50 470.00 1015.50 1145.00 7525.50
1998 1356.50 897.50 965.00 395.00 68.50 91.00 0.00 0.00 57.00 392.50 767.00 1115.00 6105.00
1999 1583.58 a 997.00 891.00 416.50 119.50 43.50 0.00 4.50 161.50 453.50 653.00 1201.00 6524.58
2000 1456.50 1014.50 734.00 489.00 177.00 42.50 10.00 4.00 152.00 352.50 923.50 1721.50 7077.00
2001 1340.00 1348.00 1089.50 429.50 169.00 69.50 9.00 0.50 165.50 483.00 506.00 1087.00 6696.50
2002 1133.00 940.00 1130.50 547.50 300.50 31.00 0.00 6.00 99.00 613.00 913.00 1157.00 6870.50
2003 1475.50 1308.50 991.50 520.50 218.00 40.50 1.00 4.00 146.50 458.00 881.50 1162.00 7207.50
2004 1560.50 1217.50 852.00 451.00 224.00 0.00 z 10.50 56.00 67.00 432.50 768.50 1271.50 6911.00
2005 1493.50 1012.00 1019.50 390.00 271.50 0.50 5.00 8.50 72.50 404.50 808.00 1399.50 6885.00
2006 1059.00 1165.00 929.00 375.50 239.00 19.50 0.00 2.50 189.00 579.50 833.50 1067.50 6459.00
2007 1304.00 1420.50 848.00 561.00 108.00 9.00 0.00 8.94 e 91.50 290.00 859.50 1417.00 6917.44
2008 1539.00 1424.00 1078.50 556.50 248.00 9.50 0.00 7.00 88.50 433.50 859.50 1550.50 7794.50
2009 1742.50 1142.50 915.50 507.00 185.50 65.00 12.00 22.00 73.00 617.50 657.00 1366.00 7305.50
2010 1530.50 1237.00 765.00 314.00 197.50 5.00 0.00 2.00 126.50 347.00 818.00 1463.00 6805.50
2011 1539.67 a 1232.50 1002.33 a 557.50 232.00 34.00 0.00 a 0.00 a 179.00 378.50 727.24 a 1119.50 7002.24
2012 1236.90 a 1028.00 470.34 b 419.48 a 100.23 a 16.50 0.00 a 10.33 a 147.41 a 322.50 j 0.00 z 0.00 z 3429.21
Period of Record Statistics
MEAN 1516.13 1242.60 1007.50 530.16 210.30 38.57 5.22 16.68 149.24 439.14 889.58 1333.51 7413.00
S.D. 192.57 156.42 153.82 101.55 77.62 27.57 6.95 15.60 50.35 104.03 124.37 175.49 523.40
SKEW 0.02 -0.26 -0.47 0.00 0.05 1.25 1.83 1.07 0.16 -0.19 -0.05 0.46 -0.31
MAX 1957.81 1569.00 1319.00 735.50 373.50 130.00 28.00 68.00 281.50 665.00 1140.50 1792.00 8369.50
MIN 1059.00 897.50 470.34 314.00 67.50 0.50 0.00 0.00 57.00 166.50 506.00 1011.00 6105.00
NO YRS 70 69 71 67 73 74 75 76 76 73 69 67 57