NORTHWOOD, IOWA

Monthly Total Heating Degree Days

(136103)

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
1896 0.00 z 0.00 z 0.00 z 449.50 128.00 41.00 14.50 42.22 b 286.50 580.00 1247.00 1160.50 3949.22
1897 1700.00 1230.50 1225.50 618.00 305.00 127.00 1.50 58.50 87.00 396.00 1064.00 1574.50 8387.50
1898 1396.50 1263.50 942.50 627.78 c 243.50 19.50 8.00 19.50 139.00 633.00 1088.50 1520.72 d 7902.00
1899 1569.00 1580.00 1420.00 555.00 261.00 25.50 5.00 1.50 224.50 389.00 702.50 1387.50 8120.50
1900 1358.00 1507.00 1174.00 373.00 156.00 26.50 9.50 0.00 203.50 278.00 1060.00 1312.50 7458.00
1901 1483.41 d 1386.50 1007.00 460.50 207.00 54.00 2.00 3.50 180.50 404.00 971.00 1461.98 c 7621.39
1902 1397.50 1336.50 866.00 570.50 165.00 107.00 10.50 32.00 233.50 458.00 823.00 1469.00 7468.50
1903 1434.00 1321.50 889.00 543.50 165.00 95.00 20.00 59.00 227.50 469.50 995.00 1559.00 7778.00
1904 1607.50 1571.00 0.00 z 650.00 242.50 55.00 12.00 64.00 118.00 287.00 o 786.50 1438.50 6545.00
1905 1787.50 0.00 z 868.50 625.00 279.00 39.50 10.00 7.50 86.50 595.50 885.00 1277.50 6461.50
1906 1375.76 b 1279.50 1248.50 456.00 257.00 68.50 12.50 2.87 d 70.00 g 544.50 937.00 1316.98 a 7499.11
1907 1639.50 1254.00 909.33 a 785.50 463.50 103.93 b 0.00 c 24.28 a 188.40 e 538.50 914.46 b 1221.92 a 8043.33
1908 0.00 z 1245.45 a 962.60 b 545.00 249.00 73.45 a 20.27 e 47.53 a 114.50 484.50 828.46 d 954.00 j 4570.76
1909 1509.00 1257.00 889.00 f 775.96 d 228.50 f 54.00 21.50 i 0.00 u 156.35 d 570.50 823.00 1602.50 6748.31
1910 1651.61 d 1505.50 656.00 440.00 c 359.27 c 54.00 e 0.00 f 23.50 158.50 415.50 1073.00 1393.00 7729.88
1911 1642.40 e 756.00 i 743.00 g 0.00 z 177.50 0.00 z 0.00 z 44.50 170.89 b 615.02 c 1182.50 1260.50 5093.31
1912 2076.50 1490.71 c 1341.50 514.50 223.00 123.00 19.50 33.00 251.50 535.35 e 872.50 1269.00 8750.06
1913 1543.00 1417.50 1176.50 538.00 320.33 a 61.00 8.02 b 3.50 212.50 604.50 772.50 1098.00 7755.35
1914 1328.87 a 1526.00 1093.50 619.00 252.00 36.67 c 2.50 18.37 d 154.00 364.50 852.50 1635.00 7882.90
1915 1604.00 1130.00 1174.50 317.00 381.00 117.00 40.50 110.50 155.00 442.00 886.00 1362.00 7719.50
1916 1604.00 1516.50 1117.00 646.50 275.50 120.00 0.00 31.50 190.00 c 404.50 j 1011.60 e 1607.19 b 8119.79
1917 1711.50 1588.00 1141.00 665.00 290.00 f 0.00 z 1.00 h 56.12 b 210.50 672.00 f 537.50 i 1329.00 h 5372.12
1918 1869.00 1299.00 857.50 690.52 a 175.50 0.00 z 0.00 z 0.00 z 315.50 466.03 a 867.50 770.00 l 6540.55
1919 1321.50 1323.50 1050.26 b 634.50 0.00 z 60.56 c 3.50 g 40.00 j 173.00 0.00 z 0.00 z 1690.57 b 6253.88
1920 1122.50 k 1323.96 c 1023.50 808.50 260.00 63.50 2.98 e 44.00 112.00 342.50 943.89 c 1302.50 6227.33
1921 1285.00 1102.50 888.67 a 458.00 201.50 a 33.60 e 0.00 b 19.00 g 99.11 b 440.56 e 1104.81 d 1327.83 d 6941.57
1922 1595.50 1359.62 b 963.50 596.11 c 131.75 a 23.00 8.27 a 11.00 129.00 341.60 e 813.33 c 1457.00 7429.67
1923 1397.50 1498.54 b 1255.00 622.50 230.36 b 38.89 c 0.00 a 28.50 f 170.00 578.87 e 863.33 c 844.50 f 6654.99
1924 542.00 t 611.50 n 647.50 m 445.00 i 499.21 b 95.00 c 29.50 68.56 e 191.50 h 349.02 b 669.50 i 1682.30 c 2723.59
1925 1560.33 a 499.50 r 674.00 i 182.50 n 209.00 i 42.50 i 22.00 f 0.00 h 106.50 866.40 b 973.00 901.50 m 3506.23
1926 967.00 l 816.00 g 771.50 j 664.00 115.50 h 95.40 e 9.30 a 1.72 d 237.00 570.83 b 1126.00 1521.00 4225.25
1927 1567.00 1097.38 b 900.00 12.50 z 0.00 z 70.00 i 11.62 c 49.94 d 199.29 b 372.50 g 0.00 z 0.00 z 3825.24
1928 0.00 z 0.00 z 950.67 a 744.00 156.50 94.50 8.00 34.50 231.50 475.00 902.00 1228.00 4824.67
1929 1910.12 a 1543.00 974.00 529.00 345.00 28.50 q 10.33 a 20.50 207.00 508.40 a 1086.00 1396.50 8529.85
1930 1832.50 1022.00 707.50 j 488.50 245.50 43.50 9.50 2.50 146.50 567.50 819.00 1345.50 6522.50
1931 1248.50 918.50 1019.50 467.00 345.50 34.50 4.00 26.00 78.50 344.00 756.96 b 1069.50 6312.46
1932 1510.50 1302.50 1324.50 563.00 186.50 3.00 8.00 11.00 183.50 563.00 1033.00 1456.00 8144.50
1933 1180.50 1369.50 1054.50 591.50 241.50 22.00 0.00 18.50 77.50 582.00 956.00 1392.50 7486.00
1934 1337.00 1243.00 1088.50 571.00 87.50 5.00 3.00 63.50 246.00 377.68 a 790.50 1524.50 7337.18
1935 1614.00 1117.00 909.50 650.50 360.00 114.00 0.00 52.18 a 143.50 518.00 1040.00 1471.00 7989.68
1936 1861.50 1881.50 1019.00 719.00 109.00 76.50 0.00 5.00 115.50 572.50 1018.50 1281.50 8659.50
1937 1848.00 1448.50 1157.50 619.00 233.50 81.50 5.50 0.00 173.00 575.50 1031.00 1496.50 8669.50
1938 1571.50 1191.00 844.75 a 566.50 302.00 50.50 0.00 a 4.00 112.00 321.00 937.50 1345.40 a 7246.15
1939 1345.00 1443.00 1042.50 665.00 136.00 44.50 1.00 27.00 128.50 483.50 801.50 1100.50 7218.00
1940 1775.50 1272.50 1188.50 625.00 292.50 25.00 10.50 53.50 136.50 330.50 1057.00 1293.50 8060.50
1941 1422.00 1366.00 1102.00 413.00 120.50 55.00 12.00 13.00 123.00 412.50 841.50 1128.00 7008.50
1942 1438.00 1259.00 904.50 401.50 307.00 72.00 16.00 28.00 270.50 452.50 918.50 1538.50 7606.00
1943 1730.00 1285.00 1249.50 608.50 349.50 75.50 2.50 24.00 265.50 489.00 1052.00 1276.00 8407.00
1944 1157.50 1235.00 1170.50 666.50 162.50 48.00 9.00 31.50 144.00 424.00 811.00 1465.00 7324.50
1945 1571.50 1256.50 756.50 615.50 400.50 151.50 27.00 19.50 232.00 490.50 964.00 1561.00 8046.00
1946 1459.00 1187.50 688.00 422.00 350.00 89.00 3.50 45.00 191.50 385.00 935.50 1270.00 7026.00
1947 1330.50 1449.00 1141.50 683.00 389.00 120.00 38.50 1.00 179.00 219.50 1093.00 1407.00 8051.00
1948 0.00 z 0.00 z 0.00 z 471.60 e 287.50 48.50 4.50 19.50 91.00 469.00 660.50 g 1336.50 2728.10
1949 1041.00 j 1387.00 1077.25 a 544.00 142.50 14.00 1.50 12.50 216.50 360.00 796.55 a 1322.50 5874.30
1950 1616.50 1341.00 1217.50 785.00 294.50 a 64.00 15.50 59.93 a 150.50 224.50 n 1072.50 1609.33 b 8226.26
1951 1667.69 d 1304.50 1359.00 752.59 a 145.46 e 51.50 m 0.00 z 0.00 z 221.50 467.67 b 1157.00 1490.07 a 8565.47
1952 1554.50 1123.50 1168.50 547.00 285.20 a 19.50 14.00 67.00 206.67 c 644.44 e 607.50 k 1329.68 c 6959.99
1953 1478.24 d 744.00 l 1029.56 e 567.50 h 231.00 i 30.58 d 7.50 i 7.00 50.00 v 200.00 j 401.50 n 924.00 i 2545.38
1954 1265.50 g 877.33 a 0.00 z 472.24 a 378.20 a 51.50 f 0.50 p 5.50 114.11 b 512.50 550.00 k 0.00 z 2359.88
1955 1537.08 a 1368.35 e 1147.00 c 345.00 a 140.53 a 62.59 a 0.00 d 9.00 112.76 a 434.52 a 1117.24 a 1569.08 e 7843.14
1956 1614.67 b 0.00 z 1192.95 c 681.11 c 171.50 f 22.20 e 3.58 e 28.42 a 189.50 295.50 943.45 a 1256.00 6227.37
1957 1669.35 a 1092.00 c 1040.22 d 525.00 242.00 42.41 a 0.00 14.50 182.50 535.50 978.00 1191.00 7512.49
1958 1338.50 1390.00 1034.00 524.50 161.50 92.00 10.00 29.00 99.50 351.50 842.50 1510.50 7383.50
1959 1668.50 1418.67 a 1074.00 514.00 171.61 c 25.50 9.00 2.50 176.00 611.50 1206.50 1086.00 7963.77
1960 1426.50 1314.00 1393.00 526.50 206.00 38.00 4.00 3.00 169.00 449.00 834.00 1422.50 7785.50
1961 1535.50 1132.50 1016.50 730.00 298.50 26.00 0.50 3.50 j 207.50 387.00 921.00 1464.50 7719.50
1962 1657.50 1358.50 1228.00 638.50 137.50 42.00 15.00 3.00 215.00 396.00 799.00 1337.00 7827.00
1963 1823.00 1366.81 a 900.00 463.50 233.00 18.50 2.50 29.00 92.50 165.00 753.50 1653.50 7500.81
1964 1288.50 1117.00 1154.50 534.00 103.50 37.50 0.00 47.50 184.50 490.50 861.00 1477.00 7295.50
1965 1638.50 1426.50 1413.50 643.50 147.00 11.50 0.00 35.50 280.00 399.50 906.00 1088.00 7989.50
1966 1834.50 1313.00 856.00 679.50 333.50 32.50 0.50 35.50 168.00 459.00 967.50 1372.00 8051.50
1967 1469.00 1430.00 937.50 529.00 367.00 20.00 35.50 49.50 164.00 531.50 981.00 1291.00 7805.00
1968 1511.00 1374.00 768.50 475.00 339.00 45.50 12.00 31.00 140.00 439.50 936.00 1450.00 7521.50
1969 1710.50 1272.50 1300.00 498.00 213.50 139.50 7.00 0.00 127.50 592.50 929.00 1437.00 8227.00
1970 1835.00 1347.00 1168.00 563.00 196.50 31.00 7.50 4.50 183.50 480.00 956.50 1445.50 8218.00
1971 1770.50 1331.00 1136.50 509.00 280.50 10.00 27.00 16.50 82.50 i 325.50 a 888.50 1358.00 7653.00
1972 1726.50 1471.00 1061.50 636.50 191.00 59.50 22.00 40.00 153.50 579.50 973.50 1606.50 8521.00
1973 1445.50 0.00 z 761.00 605.50 273.50 8.50 0.50 4.00 147.50 295.50 867.50 1482.50 5891.50
1974 1574.50 1257.50 1017.50 483.00 291.50 51.50 0.00 31.50 225.50 409.50 911.00 1290.00 7543.00
1975 1521.50 1319.50 1273.07 a 741.50 152.00 41.50 17.00 0.00 222.00 346.50 814.50 1309.00 7758.07
1976 1520.50 1012.00 956.50 410.50 221.50 7.50 0.00 8.50 146.50 629.50 1106.50 1597.50 7617.00
1977 1936.00 1126.00 771.00 320.50 44.00 10.00 0.00 30.50 91.50 520.50 961.00 1520.00 7331.00
1978 1839.50 1512.50 1075.00 546.00 196.00 24.00 3.50 7.00 74.00 475.50 993.00 1557.00 8303.00
1979 1971.00 1569.50 1166.00 662.00 248.50 29.50 2.00 30.50 108.00 499.00 977.50 1196.50 8460.00
1980 1515.50 1420.00 1146.00 515.00 173.00 18.00 0.00 4.50 106.00 579.00 821.00 1345.00 7643.00
1981 1388.00 1104.00 805.00 391.00 227.50 9.50 15.00 7.00 165.50 573.50 826.00 1490.50 7002.50
1982 1932.00 1415.00 1115.00 677.00 130.50 71.50 0.00 35.50 166.50 450.50 992.00 1214.00 8199.50
1983 1393.50 1089.00 992.00 702.00 319.50 36.50 0.00 0.00 172.00 461.26 b 876.00 1849.00 7890.76
1984 1551.50 1078.50 1210.00 564.00 234.50 6.50 5.00 6.00 186.50 397.50 894.00 1356.00 7490.00
1985 1627.50 1329.00 816.50 389.50 71.00 67.00 0.00 20.00 219.00 467.00 1184.00 1739.50 7930.00
1986 1435.50 1317.00 865.00 415.00 158.00 9.00 0.00 36.50 112.00 446.00 1089.00 1268.00 7151.00
1987 1301.50 907.50 798.50 341.50 82.00 8.00 1.03 a 60.50 143.50 651.50 782.00 1229.00 6306.53
1988 1729.50 1480.50 929.50 534.00 72.50 8.00 1.50 15.50 83.00 632.00 929.00 1421.50 7836.50
1989 1309.00 1530.00 1181.50 619.00 268.50 72.50 1.50 13.50 213.00 487.00 1113.00 1701.50 8510.00
1990 1240.50 1240.00 892.50 614.00 334.00 53.00 9.00 9.00 148.00 560.00 837.00 1561.00 7498.00
1991 1747.50 1187.00 995.00 535.00 235.50 12.50 14.50 25.50 253.00 591.50 1226.50 1335.50 8159.00
1992 1385.50 1119.00 1011.00 720.00 228.00 75.00 67.00 88.00 233.50 565.00 1035.50 1414.00 7941.50
1993 1669.00 1416.50 1234.00 706.50 299.50 84.50 6.50 26.00 332.50 603.50 1032.50 1379.50 8790.50
1994 1878.00 1549.00 999.00 578.28 a 236.50 28.00 p 12.00 i 54.00 134.50 436.50 845.50 1311.00 8022.28
1995 1557.00 1284.50 1025.00 734.50 318.50 51.50 15.00 0.00 246.50 560.50 1190.00 1408.00 8391.00
1996 1707.50 1382.00 1267.50 727.50 386.00 73.00 13.50 10.50 229.50 524.50 1230.00 0.00 z 7551.50
1997 1714.50 1314.00 1071.50 728.50 454.50 16.00 45.98 a 48.00 174.00 541.50 1145.00 1248.00 8501.48
1998 1481.00 996.00 1123.50 518.50 129.50 121.03 a 6.50 0.00 z 96.50 504.50 872.50 1236.00 7085.53
1999 1699.26 d 1060.37 a 1013.38 b 574.66 a 215.28 d 81.43 b 2.77 c 20.00 237.50 561.00 733.50 1298.50 7497.64
2000 1581.00 1110.80 a 774.00 603.00 211.83 a 80.50 22.73 a 19.50 211.03 a 442.55 b 1099.82 b 1848.00 8004.78
2001 1519.50 1552.96 a 1281.00 505.86 a 236.00 89.00 7.00 25.50 244.00 572.50 599.50 1168.50 7801.33
2002 1275.50 1112.00 1244.50 625.00 361.00 45.00 5.00 24.00 152.50 697.00 1005.00 1271.50 7818.00
2003 1566.50 1384.50 1079.50 584.00 290.50 66.00 9.00 5.00 208.00 513.50 1004.50 1253.00 7964.00
2004 1610.00 1332.00 895.00 532.00 284.50 88.00 25.50 126.00 104.50 460.50 843.50 1343.00 7644.50
2005 1587.00 423.00 q 1091.50 437.50 348.00 9.00 14.00 22.50 119.00 475.00 867.00 1523.00 6493.50
2006 1166.00 1281.50 1018.50 449.00 269.50 50.00 2.50 8.00 266.00 653.00 890.00 1182.17 e 7236.17
2007 1469.00 1529.00 954.28 a 656.50 142.00 30.50 8.50 16.00 164.00 402.50 916.20 e 1551.55 a 7840.03
2008 1687.20 d 915.50 l 924.50 f 697.00 321.50 28.50 0.00 42.50 159.00 554.50 920.00 1658.50 6068.70
2009 1829.50 1257.50 1051.50 626.00 234.00 k 96.60 e 44.43 a 68.50 128.00 705.00 756.50 1515.50 8079.03
2010 1733.42 a 1495.93 a 944.00 405.50 269.50 14.00 p 0.00 10.00 182.00 440.50 936.50 1532.50 7949.84
2011 1714.19 d 1335.00 1132.50 630.54 b 298.12 a 46.67 c 1.00 6.00 227.78 c 217.50 j 256.50 u 1228.00 6619.78
2012 1306.50 1096.00 556.00 500.50 149.66 b 27.32 b 0.00 b 41.50 g 206.50 620.50 843.89 c 1293.50 6600.37
2013 1503.00 1286.78 e 1293.22 a 37.00 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 4083.00
Period of Record Statistics
MEAN 1570.18 1309.97 1048.95 571.90 242.66 52.84 9.30 26.67 173.10 486.69 945.37 1399.86 7792.19
S.D. 192.71 170.48 171.99 111.33 91.39 34.66 11.62 23.84 55.75 109.41 128.98 164.37 493.97
SKEW 0.09 -0.05 -0.18 -0.14 0.22 0.68 2.22 1.39 0.31 0.02 0.26 0.30 -0.41
MAX 2076.50 1881.50 1420.00 808.50 499.21 151.50 67.00 126.00 332.50 866.40 1247.00 1849.00 8790.50
MIN 1157.50 877.33 556.00 317.00 44.00 3.00 0.00 0.00 74.00 165.00 599.50 1069.50 6306.53
NO YRS 109 105 107 112 108 107 106 107 113 109 108 108 75