ROCK RAPIDS, IOWA

Monthly Total Heating Degree Days

(137147)

Base Temperature = 65 F

File last updated on Apr 6, 2013
*** Note *** Provisional Data *** After Year/Month 201302
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
1893 0.00 z 0.00 z 0.00 z 185.50 w 279.00 25.00 0.00 a 60.50 197.00 541.50 1001.50 1461.00 3565.50
1894 1709.00 1412.00 869.55 a 455.50 188.00 19.00 0.00 11.00 97.00 386.00 1010.00 1162.00 7319.05
1895 1814.53 a 1446.00 1142.00 309.00 266.00 44.00 17.00 9.00 151.50 535.00 1062.41 a 1445.00 8241.45
1896 1315.00 1219.50 1230.70 a 402.00 j 230.00 69.23 d 2.00 27.90 a 319.50 736.50 1408.93 b 1173.50 7732.76
1897 1598.50 1299.00 1245.00 580.86 a 281.58 a 104.50 5.00 48.50 76.50 392.67 a 920.00 i 1568.00 7200.11
1898 1322.00 0.00 z 955.66 b 555.50 328.00 0.00 z 7.23 a 0.00 z 0.00 z 687.00 0.00 z 1614.00 5469.39
1899 1587.00 1727.50 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 0.00 z 3314.50
1900 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
1901 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
1902 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
1903 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
1904 1661.50 1532.00 982.50 651.50 170.00 24.50 13.00 27.50 171.00 435.50 710.00 1360.00 7739.00
1905 1708.00 1522.00 746.58 a 654.50 298.50 39.00 11.00 0.00 44.00 667.00 795.00 1222.50 7708.08
1906 1320.00 1205.50 1269.50 452.50 0.00 z 59.00 5.00 18.00 151.00 680.00 950.00 1345.00 7455.50
1907 1767.00 1249.50 861.00 847.00 462.00 105.00 1.00 5.00 190.50 579.00 917.50 1246.00 8230.50
1908 1369.00 1357.00 974.50 519.50 321.00 47.50 11.50 21.00 95.50 0.00 z 0.00 z 0.00 z 4716.50
1909 1588.00 1260.50 1110.50 839.50 281.00 36.00 0.50 7.00 98.00 522.50 817.50 1668.00 8229.00
1910 1552.00 1466.00 601.50 398.28 a 0.00 z 8.00 j 0.00 20.15 a 183.50 424.18 a 1018.50 1314.00 6978.11
1911 1576.50 1202.00 858.50 544.50 146.00 0.00 6.00 34.00 98.50 615.00 1147.00 1311.50 7539.50
1912 1992.50 1369.21 a 1241.00 481.50 174.00 117.50 12.50 13.50 301.00 576.50 908.50 1345.50 8533.21
1913 0.00 z 1424.50 1198.00 592.00 339.00 0.00 z 0.00 z 0.00 c 223.00 682.50 823.00 1236.00 6518.00
1914 1301.00 1562.81 a 0.00 z 695.00 259.50 47.50 3.00 21.50 91.50 358.50 818.00 1709.00 6867.31
1915 1576.00 0.00 z 1196.50 336.00 399.00 116.00 31.00 a 73.00 180.00 422.00 853.50 1352.00 6535.00
1916 1740.00 1469.50 1013.00 614.50 257.00 101.00 0.00 17.50 177.50 526.00 919.50 1619.00 8454.50
1917 1680.50 1544.00 1107.00 607.00 372.50 93.00 10.00 34.50 143.00 749.00 766.00 1688.50 8795.00
1918 1797.00 1300.50 756.50 593.00 146.00 31.00 15.00 15.00 291.72 a 433.50 847.00 1106.50 7332.72
1919 1245.50 1271.50 967.00 571.50 270.00 54.50 0.00 13.00 112.50 658.50 1107.00 1578.42 a 7849.42
1920 1543.50 1265.00 1023.00 757.00 252.00 65.50 1.50 37.00 123.00 335.50 955.00 1323.00 7681.00
1921 1256.00 1040.50 798.00 445.00 220.50 18.50 1.00 15.50 115.00 392.50 1092.00 1285.50 6680.00
1922 1569.50 1405.00 925.35 a 502.50 147.50 18.50 8.50 8.50 102.50 387.00 779.50 1447.50 7301.85
1923 1301.50 1331.50 1198.50 563.50 218.00 56.00 0.50 20.50 114.00 586.00 825.50 1125.00 7340.50
1924 1717.50 1209.00 1089.50 536.00 411.50 70.00 16.50 16.00 224.00 295.00 916.50 1707.50 8209.00
1925 1621.50 1182.00 836.50 294.00 309.00 34.00 12.50 3.00 89.00 856.00 947.07 a 1445.50 7630.07
1926 1450.50 1034.50 1053.00 569.00 116.00 66.00 4.50 0.00 212.50 504.27 a 1086.00 1489.50 7585.77
1927 1411.50 1087.00 901.50 561.50 292.00 113.50 9.50 50.00 204.00 404.50 1010.50 1725.00 7770.50
1928 1395.00 1205.50 915.00 738.00 158.50 91.00 3.50 31.00 237.50 487.00 915.00 1176.00 7353.00
1929 1830.00 1576.00 895.50 515.00 314.00 76.00 0.50 12.50 265.50 518.00 1096.00 1421.00 8520.00
1930 1846.00 953.50 957.00 469.00 242.50 51.50 9.00 3.50 150.50 531.00 834.00 1192.50 7240.00
1931 1145.00 876.50 951.00 464.00 295.00 25.50 8.00 18.50 72.00 348.50 825.00 1128.00 6157.00
1932 1546.00 1268.00 1240.00 509.50 177.00 3.00 8.27 a 9.00 166.00 573.50 1055.50 1516.00 8071.77
1933 1177.50 1405.00 992.00 561.50 257.50 12.00 0.00 19.00 87.50 545.50 897.93 a 1335.00 7290.43
1934 1326.00 1154.50 1026.00 521.00 69.00 8.50 7.00 44.50 268.50 349.00 815.17 a 1467.50 7056.67
1935 1537.50 1000.00 829.00 607.00 358.50 102.50 0.00 50.00 130.00 555.00 1072.50 1381.50 7623.50
1936 1913.50 1941.00 969.00 669.50 103.33 a 52.50 0.00 0.00 88.97 a 535.78 a 966.00 1280.00 8519.58
1937 1884.50 1379.50 1057.00 602.00 164.00 80.69 a 1.50 0.00 140.00 559.50 1013.28 a 1456.00 8337.96
1938 1555.00 1260.00 825.50 491.00 270.50 34.00 0.00 0.00 87.50 269.50 965.50 1261.50 7020.00
1939 1255.00 1475.00 974.00 570.50 71.50 25.00 0.00 17.05 a 128.00 479.00 833.00 1086.00 6914.05
1940 1822.00 1305.00 1144.50 601.03 a 231.50 23.00 4.50 29.00 99.00 262.50 1109.50 1263.50 7895.03
1941 1390.50 1283.00 1057.00 429.00 103.50 53.50 13.00 13.43 a 134.50 427.28 a 864.50 1164.50 6933.72
1942 1374.50 1213.50 910.50 384.50 317.00 51.00 7.00 12.50 280.00 482.00 890.00 1467.50 7390.00
1943 1695.50 1109.50 1152.50 508.50 335.00 69.00 1.00 16.00 220.50 484.12 a 997.00 1234.50 7823.12
1944 1137.00 1238.50 1184.50 675.50 155.50 59.00 2.50 38.50 133.50 432.00 829.00 1335.50 7221.00
1945 1408.00 1168.00 770.50 583.00 375.00 139.50 15.50 15.50 187.50 442.50 958.50 1593.50 7657.00
1946 1501.00 1175.50 679.50 384.50 300.50 69.83 a 0.00 30.00 171.50 450.50 973.50 1251.50 6987.83
1947 1271.00 1372.50 1074.00 643.00 326.50 86.00 3.10 a 1.00 156.00 247.00 1055.50 1338.17 a 7573.77
1948 1541.00 1331.00 1083.50 383.00 223.00 40.50 1.00 12.50 78.50 480.00 924.50 1387.50 7486.00
1949 1609.50 1384.50 1032.00 528.00 141.00 16.50 2.50 13.95 a 221.00 413.00 734.50 1330.00 7426.45
1950 1795.50 1256.50 1175.50 779.00 308.00 57.50 19.50 50.78 b 117.00 365.00 1014.00 1464.50 8402.78
1951 1573.25 a 1135.00 1354.00 695.00 167.00 103.50 23.00 20.50 250.00 524.50 1095.00 1537.00 8477.75
1952 1612.50 1115.50 1155.00 496.50 233.00 15.50 4.50 6.50 136.00 599.50 909.00 1316.50 7600.00
1953 1472.00 1175.00 972.00 707.14 b 253.00 29.00 7.00 4.00 140.00 313.50 804.50 1318.00 7195.14
1954 1624.00 850.00 1108.50 460.50 359.50 49.00 0.00 2.50 109.66 a 530.00 742.50 1254.00 7090.16
1955 1403.00 1384.50 1067.50 301.00 100.23 a 68.00 0.00 a 3.50 142.50 405.07 a 1161.00 1623.00 7659.30
1956 1624.50 1458.00 1121.00 670.50 196.00 13.00 0.00 21.50 147.50 252.50 934.50 1223.00 7662.00
1957 1679.00 1132.00 1022.50 551.00 260.00 40.00 0.00 15.50 198.00 514.00 923.50 1103.50 7439.00
1958 1266.50 1342.50 1014.50 527.00 142.00 89.50 10.50 15.00 95.50 382.00 870.50 1460.50 7216.00
1959 1629.50 1427.00 947.50 517.50 198.00 22.00 6.00 0.00 182.00 608.50 1196.00 1073.00 7807.00
1960 1524.00 1415.30 a 1429.00 536.50 216.50 30.50 3.00 2.00 165.50 446.50 848.50 1350.50 7967.80
1961 1573.00 1175.00 913.50 670.00 295.50 34.50 1.03 a 4.00 189.50 419.00 941.50 1506.50 7723.03
1962 1621.50 1324.00 1254.00 590.00 112.00 35.50 9.00 3.50 191.00 386.50 760.00 1280.50 7567.50
1963 1765.00 1254.00 810.50 415.50 196.50 6.00 0.00 11.50 67.50 181.50 750.50 1597.00 7055.50
1964 1287.00 1107.50 1142.50 489.50 127.00 31.00 0.00 49.50 176.50 456.00 884.50 1491.50 7242.50
1965 1579.50 1373.00 1323.00 560.00 123.00 4.50 1.50 32.00 325.50 369.00 906.50 626.50 m 6597.50
1966 1763.50 1297.50 827.00 667.50 275.00 41.50 0.00 30.50 161.00 449.50 971.50 1362.40 b 7846.90
1967 1441.50 1337.50 831.83 a 487.00 374.58 a 26.00 22.50 27.50 132.41 a 464.47 b 937.24 a 1266.87 a 7349.40
1968 1479.00 1286.00 733.50 452.00 308.50 25.50 12.50 7.00 116.50 431.50 886.50 1434.27 a 7172.77
1969 1703.97 a 1236.50 1339.50 479.50 171.50 109.00 0.00 z 0.00 f 108.50 636.50 936.50 1368.00 8089.47
1970 1863.50 1303.50 1191.00 587.50 216.00 31.00 12.00 6.00 201.50 561.00 979.50 1491.00 8443.50
1971 1711.50 1288.50 1077.50 500.50 272.00 11.50 26.00 9.00 200.50 383.50 941.50 1450.00 7872.00
1972 1737.50 1528.50 1053.50 631.50 216.00 34.50 29.00 40.00 199.50 617.50 963.00 1552.50 8603.00
1973 1453.00 1201.00 782.00 545.00 296.50 27.50 1.50 1.00 190.50 365.00 0.00 z 1479.50 6342.50
1974 1647.00 1170.00 965.00 512.00 277.50 48.50 1.00 0.00 z 264.00 495.00 913.50 1291.50 7585.00
1975 1514.50 1389.50 1278.50 716.50 169.00 65.00 10.52 c 0.50 254.00 430.50 899.50 1389.00 8117.02
1976 1567.00 1035.00 1011.00 399.50 258.50 26.00 0.00 0.00 a 156.50 642.00 1089.00 0.00 z 6184.50
1977 1878.00 1100.00 851.50 339.50 38.00 2.00 0.50 35.65 a 109.50 528.00 962.68 b 1483.50 7328.83
1978 1922.50 0.00 z 1100.00 559.50 203.50 55.34 a 7.50 14.98 a 78.75 b 494.50 1024.00 1552.07 a 7012.64
1979 1976.50 1649.50 1179.50 638.79 a 325.50 49.66 a 0.00 33.50 126.50 540.50 1017.00 1187.30 a 8724.25
1980 1446.50 1385.00 1091.72 a 479.50 198.00 26.38 a 1.00 8.00 133.50 575.00 823.00 1375.00 7542.60
1981 1365.00 1120.00 885.10 b 352.76 a 241.50 17.59 a 11.37 a 16.50 124.00 571.50 808.00 1463.50 6976.81
1982 1932.50 0.00 z 1032.50 635.00 138.00 80.50 0.00 24.00 180.00 525.00 1039.00 1266.50 6853.00
1983 1434.50 1140.50 1006.50 714.50 323.00 60.50 0.00 0.00 193.00 522.00 918.00 1990.50 8303.00
1984 1543.50 1109.00 1249.50 579.50 278.50 17.00 3.00 14.50 286.00 503.00 923.50 1403.00 7910.00
1985 1695.00 1343.50 470.00 k 433.50 102.50 81.50 3.00 32.00 253.00 554.00 1267.00 1781.50 7546.50
1986 1405.00 1327.50 898.50 476.00 171.50 9.00 0.00 59.00 164.00 485.00 1114.00 1265.00 7374.50
1987 1323.50 888.50 864.00 389.50 86.50 n 22.50 4.00 55.50 110.00 679.00 785.50 1256.50 6378.50
1988 1763.00 1515.00 905.50 612.00 81.00 2.50 3.00 23.50 140.50 643.00 941.50 1361.50 7992.00
1989 1247.50 1551.50 1125.50 569.50 242.50 73.50 0.00 7.50 205.50 495.50 1078.00 1687.00 8283.50
1990 1193.50 1185.00 913.50 622.00 299.50 55.50 17.50 12.50 135.00 569.00 912.50 1527.50 7443.00
1991 1702.00 1058.00 910.50 505.00 225.00 11.50 2.50 10.50 212.00 592.50 1248.00 1307.50 7785.00
1992 1246.50 1070.00 922.50 724.50 205.00 46.00 42.50 87.00 202.00 537.00 1055.00 1423.50 7561.50
1993 1654.50 1442.50 1202.00 672.50 275.00 98.00 3.00 23.00 295.50 570.00 1092.50 1382.50 8711.00
1994 1851.00 1530.00 926.00 597.00 193.50 9.50 15.00 34.50 127.00 439.50 871.00 1356.50 7950.50
1995 1533.50 1203.00 1007.50 736.00 326.50 66.00 12.00 9.50 226.50 557.00 1149.00 1315.00 8141.50
1996 1686.50 1295.00 1238.00 694.50 354.00 36.00 4.50 2.50 234.00 507.00 1221.00 1636.00 8909.00
1997 1754.00 1297.50 1068.00 714.00 411.00 0.50 17.50 18.00 115.50 466.50 1091.00 1208.50 8162.00
1998 1415.00 924.00 1125.50 537.50 99.50 101.50 1.00 1.00 55.00 418.50 853.50 1214.00 6746.00
1999 1617.00 1002.00 942.00 543.00 185.50 74.00 2.50 5.50 202.50 530.50 710.00 1243.10 a 7057.60
2000 1468.50 1063.00 794.50 564.00 182.00 66.72 a 18.00 8.78 a 187.00 439.00 1160.00 1801.50 7753.01
2001 1470.00 1492.00 1213.00 537.00 196.50 43.50 0.00 a 10.50 166.50 523.50 613.50 1193.00 7459.00
2002 1296.50 1047.50 1292.50 564.00 350.00 23.00 4.00 18.50 142.50 718.00 980.50 1224.00 7661.00
2003 1499.50 1341.00 1030.50 502.00 265.50 51.00 0.50 8.50 203.50 451.00 1013.50 1268.00 7634.50
2004 1565.50 1360.00 829.50 488.50 274.50 57.00 10.50 71.00 82.50 459.50 827.50 1263.00 7289.00
2005 1580.00 1044.00 1020.00 428.00 271.00 2.00 6.00 9.50 69.50 459.00 828.00 1472.00 7189.00
2006 1082.50 1213.00 987.50 411.00 217.00 26.50 1.50 6.00 247.00 595.00 892.50 1161.50 6841.00
2007 1475.00 1473.00 853.00 622.00 110.00 14.00 1.00 2.50 154.00 377.50 926.00 1537.50 7545.50
2008 1670.00 1519.00 1150.50 676.50 283.00 7.00 1.00 6.00 135.00 501.50 908.00 1595.50 8453.00
2009 1660.50 1167.50 1005.50 627.00 240.50 74.50 19.50 34.00 93.50 712.50 712.50 1539.00 7886.50
2010 1702.50 1421.00 900.00 350.50 273.50 14.50 0.00 1.50 141.50 395.50 929.50 1550.00 7680.00
2011 1704.50 1337.26 a 1096.50 620.00 242.00 39.44 c 0.00 a 3.50 221.50 428.00 894.50 1233.00 7820.20
2012 1328.35 a 1136.18 a 547.00 421.00 131.00 29.50 0.00 23.50 178.50 629.00 895.50 1323.00 6642.53
2013 1495.50 1229.00 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 2724.50
Period of Record Statistics
MEAN 1554.35 1280.80 1017.30 550.86 236.62 47.01 6.25 18.85 163.44 495.29 944.72 1389.94 7676.41
S.D. 202.38 183.67 166.68 114.64 85.58 31.75 7.83 17.69 62.40 116.38 132.87 174.11 541.75
SKEW -0.08 0.27 -0.08 0.04 0.00 0.64 1.81 1.41 0.49 0.13 0.50 0.61 0.10
MAX 1992.50 1941.00 1429.00 847.00 462.00 139.50 42.50 87.00 325.50 856.00 1408.93 1990.50 8909.00
MIN 1082.50 850.00 547.00 294.00 38.00 0.00 0.00 0.00 44.00 181.50 613.50 1073.00 6157.00
NO YRS 115 112 112 113 112 112 113 112 114 114 111 112 96