ROCK RAPIDS, IOWA

Monthly Total Growing Degree Days

(137147)

Base Temperature = 40 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 10.00 w 501.00 921.50 1080.35 a 874.50 654.50 273.50 84.00 0.00 4389.35
1894 0.00 0.00 108.50 a 332.50 626.50 980.50 1152.00 1015.00 745.00 399.00 14.00 5.00 5378.00
1895 0.00 a 7.00 45.50 446.00 579.00 764.50 966.50 933.50 756.50 311.50 52.76 a 0.00 4862.76
1896 6.00 18.00 17.05 a 153.50 j 572.50 808.27 d 972.00 947.05 a 434.50 122.00 0.54 b 0.00 3897.91
1897 0.00 0.00 6.00 182.59 a 499.62 a 793.00 1011.00 797.50 865.00 410.23 a 0.00 i 0.00 4564.94
1898 0.00 0.00 z 40.62 b 209.50 466.00 0.00 z 921.73 a 0.00 z 0.00 z 153.00 0.00 z 0.00 1790.85
1899 1.00 4.50 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 5.50
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 0.00 0.00 31.00 131.00 626.50 819.00 910.50 853.50 603.00 356.50 106.50 1.00 4438.50
1905 0.00 14.50 162.75 a 178.00 477.50 829.50 933.50 1071.00 832.00 216.00 56.00 0.00 4770.75
1906 0.00 0.00 15.00 301.50 0.00 z 773.00 950.00 993.00 709.00 135.00 47.00 0.00 3923.50
1907 0.00 7.00 131.00 44.00 339.00 721.00 967.00 943.00 611.00 214.00 42.00 0.00 4019.00
1908 0.00 0.00 20.00 295.50 477.00 785.50 1054.50 918.00 869.50 0.00 z 0.00 z 0.00 z 4420.00
1909 0.00 0.00 0.00 41.50 510.00 852.50 1049.50 1155.50 700.00 306.50 140.00 0.00 4755.50
1910 0.00 0.00 244.00 414.31 a 0.00 z 745.50 j 1089.50 986.83 a 604.00 389.57 a 4.00 0.00 3732.21
1911 0.00 0.00 60.50 275.00 747.50 1077.50 1026.00 891.00 706.50 206.50 2.00 0.00 4992.50
1912 0.00 0.00 a 12.00 284.50 634.00 734.50 1012.00 865.50 529.50 205.50 23.00 0.00 4300.50
1913 0.00 z 3.00 24.00 199.50 455.00 0.00 z 0.00 z 1067.84 c 704.50 227.50 52.50 9.50 2743.34
1914 1.00 0.00 a 0.00 z 186.00 580.00 862.50 1138.50 969.50 689.50 426.00 107.00 0.00 4960.00
1915 0.00 0.00 z 0.00 449.50 396.50 692.50 869.03 a 769.00 589.50 353.50 84.00 0.00 4203.53
1916 0.00 0.00 32.00 191.00 552.00 701.50 1202.50 1004.00 647.50 296.50 69.00 1.50 4697.50
1917 0.00 0.00 22.00 157.50 428.50 724.50 1005.50 883.50 636.00 154.50 87.50 0.00 4099.50
1918 0.00 0.00 141.50 173.00 693.50 878.00 977.50 984.50 461.38 a 371.00 78.50 2.50 4761.38
1919 0.00 0.00 55.50 203.50 545.00 918.50 1108.50 916.00 694.00 202.50 2.50 0.00 a 4646.00
1920 0.00 0.00 85.50 97.50 542.50 875.50 981.00 824.00 707.00 462.00 7.00 0.00 4582.00
1921 0.00 13.50 100.00 332.50 636.50 1022.00 1113.00 950.50 684.00 382.50 10.00 6.50 5251.00
1922 0.00 0.00 43.40 a 250.50 663.00 931.00 926.50 1005.00 759.00 417.00 77.50 0.00 5072.90
1923 0.00 0.00 9.50 224.50 587.50 892.50 1103.00 878.00 679.00 254.00 36.50 2.50 4667.00
1924 0.00 3.50 1.50 256.00 379.00 770.00 923.00 934.50 532.00 487.50 45.00 0.00 4332.00
1925 0.00 0.00 108.00 469.50 537.50 861.50 1012.50 1038.00 807.50 105.50 8.79 a 0.00 4948.79
1926 0.00 1.00 46.50 267.00 773.50 795.50 1092.50 989.50 601.00 301.73 a 17.50 0.00 4885.73
1927 0.00 1.50 42.00 228.00 498.50 761.00 909.00 816.50 711.50 370.50 12.50 0.00 4351.00
1928 0.00 0.00 69.50 121.50 646.50 681.00 1000.00 949.00 534.50 339.00 26.00 0.00 4367.00
1929 0.00 0.00 48.50 269.00 494.50 756.00 1031.50 963.50 529.00 284.50 1.50 0.00 4378.00
1930 0.00 23.00 34.50 290.00 562.00 814.00 1120.50 1044.50 644.50 354.00 80.00 0.00 4967.00
1931 7.50 5.00 23.50 317.00 536.00 1060.00 1087.50 995.00 883.50 441.50 96.00 2.50 5455.00
1932 0.00 5.00 11.50 244.50 646.00 919.50 1077.25 a 980.50 598.50 234.50 24.00 0.00 4741.25
1933 0.00 5.00 35.00 214.50 548.50 1086.50 1094.00 879.00 777.00 257.00 28.97 a 1.50 4926.97
1934 4.00 2.00 31.50 252.50 928.50 958.50 1089.50 940.00 509.00 446.00 64.14 a 0.00 5225.64
1935 0.00 0.00 121.50 207.50 418.50 734.00 1230.00 1021.50 710.00 268.00 16.50 0.00 4727.50
1936 0.00 0.00 31.00 205.50 758.98 a 870.00 1335.50 1164.50 793.97 a 303.80 a 21.50 0.00 5484.75
1937 0.00 0.00 14.00 203.50 646.00 798.10 a 1109.50 1148.50 723.50 265.50 63.62 a 0.00 4972.22
1938 0.00 0.00 97.00 329.00 527.50 843.50 1089.50 1105.00 769.50 542.00 55.50 0.00 5358.50
1939 0.00 0.00 109.50 247.50 814.00 893.00 1097.00 925.35 a 804.50 318.50 45.50 16.50 5271.35
1940 0.00 0.00 12.00 177.93 a 569.00 878.50 1114.00 912.00 807.50 521.50 33.50 0.00 5025.93
1941 0.00 0.00 12.50 332.50 791.50 846.00 1057.00 1054.52 a 726.50 382.33 a 53.00 21.50 5277.35
1942 1.50 0.00 35.50 391.00 495.00 815.00 994.00 975.00 526.00 343.00 60.50 0.00 4636.50
1943 0.00 12.50 94.00 263.00 480.50 867.50 1065.50 1000.50 560.00 316.20 a 1.00 2.00 4662.70
1944 16.00 0.00 0.00 121.50 740.50 873.50 969.50 940.00 647.50 343.00 89.00 0.00 4740.50
1945 0.00 0.00 183.50 217.00 414.50 671.00 966.50 988.50 646.00 342.50 47.00 0.00 4476.50
1946 0.00 0.00 211.50 372.00 478.00 857.59 a 1037.00 893.50 620.00 330.50 5.50 3.50 4809.09
1947 6.50 0.00 16.50 139.00 451.00 735.00 1028.17 a 1224.50 763.50 554.00 36.50 0.00 a 4954.67
1948 0.00 3.00 52.00 390.00 583.00 790.50 1039.50 1015.00 800.00 303.00 65.00 0.00 5041.00
1949 0.00 0.00 15.00 265.00 695.00 931.50 1086.00 1009.05 a 533.00 379.50 91.50 0.00 5005.55
1950 0.00 0.00 22.00 90.50 483.00 840.00 864.50 835.40 b 664.00 422.00 30.00 0.00 4251.40
1951 0.00 a 11.00 0.00 122.50 624.00 694.50 946.00 894.50 502.50 305.00 19.00 9.50 4128.50
1952 0.00 0.00 14.00 303.00 566.50 955.00 1039.50 934.50 706.50 221.00 73.50 1.00 4814.50
1953 0.00 0.00 45.00 113.57 b 564.00 941.00 1023.50 1008.00 667.50 482.00 89.50 1.00 4935.07
1954 0.00 15.50 6.50 343.00 450.00 905.00 1116.50 955.00 691.55 a 265.00 114.50 0.00 4862.55
1955 0.00 0.00 47.50 451.50 726.43 a 791.00 1188.33 a 1163.00 735.00 384.92 a 13.50 0.00 5501.18
1956 0.00 0.00 19.00 132.00 649.00 1051.00 960.00 970.00 652.00 542.50 46.50 0.00 5022.00
1957 0.00 0.00 14.50 287.50 537.00 808.00 1181.50 955.50 570.50 292.50 23.50 0.00 4670.50
1958 0.00 12.00 14.50 223.50 698.00 743.50 931.00 1076.00 745.00 412.00 67.50 0.00 4923.00
1959 0.00 0.00 40.00 258.50 632.50 978.00 1032.50 1103.50 657.50 185.50 8.00 5.00 4901.00
1960 0.00 0.00 a 5.50 256.00 577.00 790.00 1026.00 1019.50 682.50 355.00 49.50 3.50 4764.50
1961 0.00 0.00 37.00 144.00 499.00 857.50 994.07 a 1009.00 629.00 357.00 24.00 5.50 4556.07
1962 0.00 0.00 1.50 242.50 737.50 827.00 964.00 970.50 581.00 424.50 68.00 38.00 4854.50
1963 0.00 1.50 131.00 345.00 619.50 1003.00 1082.50 980.00 758.00 614.00 86.00 0.00 5620.50
1964 0.00 0.00 6.00 291.00 736.00 904.50 1137.50 870.50 631.00 329.00 140.00 0.00 5045.50
1965 0.00 0.00 2.00 206.00 697.00 879.50 1019.50 937.00 442.50 414.50 54.50 1.00 m 4652.50
1966 0.00 1.00 111.00 134.00 524.50 861.00 1163.50 888.00 626.50 336.00 27.00 0.53 b 4673.03
1967 0.00 0.00 147.25 a 283.00 465.00 a 807.00 989.50 914.50 651.72 a 346.34 b 25.86 a 0.00 a 4630.18
1968 0.00 0.00 186.50 316.50 475.00 941.50 984.00 1038.50 666.00 369.00 51.50 0.00 a 5028.50
1969 0.00 a 0.00 0.00 287.00 668.00 708.50 0.00 z 825.00 f 680.00 202.00 48.50 0.00 2594.00
1970 0.00 0.00 0.50 232.00 624.50 912.50 1061.00 989.50 646.00 265.50 10.00 4.00 4745.50
1971 0.00 3.50 33.50 294.50 507.50 997.50 924.00 965.00 621.00 423.50 40.00 0.00 4810.00
1972 0.00 0.00 37.50 175.50 637.50 848.50 944.50 940.50 587.50 222.00 16.50 0.00 4410.00
1973 0.00 0.00 63.50 239.00 492.00 900.00 1037.00 1063.00 592.50 422.50 0.00 z 0.00 4809.50
1974 0.00 3.00 42.00 260.00 521.50 844.50 1178.50 0.00 z 505.50 297.50 52.50 0.00 3705.00
1975 0.00 0.00 9.00 141.50 665.50 796.50 1077.25 c 1014.00 528.50 366.50 120.50 0.00 4719.25
1976 0.00 18.50 75.00 358.50 551.00 913.50 1151.50 1065.88 a 683.50 235.50 24.00 0.00 z 5076.88
1977 0.00 6.00 97.00 463.00 855.00 941.50 1120.00 867.48 a 684.00 252.50 79.29 b 0.00 5365.77
1978 0.00 0.00 z 57.50 213.50 626.00 883.97 a 1033.50 982.18 a 832.50 b 291.50 83.00 0.00 a 5003.65
1979 0.00 0.00 0.00 186.72 a 473.50 862.24 a 1055.50 903.00 695.00 262.50 21.00 2.07 a 4461.53
1980 0.00 0.00 17.05 a 300.50 648.50 892.76 a 1091.50 958.00 675.00 260.00 71.00 0.00 4914.31
1981 3.50 38.50 57.19 b 405.00 a 551.00 880.34 a 1045.22 a 923.00 663.50 249.00 105.50 0.00 4921.75
1982 0.00 0.00 z 19.00 223.50 666.50 724.50 1091.50 961.50 607.00 278.50 24.50 7.50 4604.00
1983 0.00 0.00 44.50 116.50 463.00 820.50 1159.50 1182.50 662.50 274.00 64.50 0.00 4787.50
1984 0.00 1.50 0.00 176.50 504.50 884.50 1015.50 1031.00 507.00 301.00 35.00 0.00 4456.50
1985 0.00 0.00 77.50 k 378.50 729.50 769.50 1003.00 832.50 589.50 235.50 6.50 0.00 4544.50
1986 0.00 0.00 78.50 289.00 633.50 958.00 1103.00 821.50 603.00 309.50 9.50 0.00 4805.50
1987 2.00 6.00 79.50 396.00 360.50 n 969.00 1111.50 895.50 665.50 155.50 93.50 0.00 4374.00
1988 0.00 0.00 56.00 170.00 778.00 1084.50 1075.00 1044.50 655.00 180.00 20.00 0.00 5063.00
1989 1.00 0.00 75.50 261.50 567.00 805.50 1120.00 966.50 593.00 318.50 6.50 0.00 4715.00
1990 1.50 0.50 67.50 230.50 483.50 888.00 972.50 942.00 753.50 228.00 74.50 1.00 4643.00
1991 0.00 3.50 59.50 270.50 668.50 976.50 997.00 958.50 625.00 260.00 0.00 0.00 4819.00
1992 0.00 1.50 57.00 126.50 606.50 785.00 782.00 755.00 567.00 281.50 4.00 0.00 3966.00
1993 0.00 0.00 21.50 129.00 503.00 722.50 943.00 946.00 460.50 261.00 6.00 0.00 3992.50
1994 0.00 0.00 47.50 243.00 666.50 921.00 891.00 855.00 696.50 343.00 48.00 0.00 4711.50
1995 0.00 0.00 80.50 90.50 448.50 861.00 1021.50 1066.00 564.50 244.00 1.00 0.00 4377.50
1996 0.00 11.00 20.00 136.50 451.00 897.50 925.50 915.50 572.00 297.00 12.50 0.00 4238.50
1997 0.00 0.00 36.50 176.50 374.00 927.50 1045.00 945.00 707.50 390.50 6.00 0.00 4608.50
1998 0.50 11.50 69.50 236.50 755.00 766.50 1023.00 988.50 828.50 356.50 48.50 33.50 5118.00
1999 0.00 3.50 46.50 233.50 608.50 820.50 1101.50 942.50 603.50 271.50 119.00 2.58 a 4753.08
2000 0.00 46.00 119.00 226.00 633.00 800.69 a 1018.00 990.45 a 626.50 373.50 47.50 0.00 4880.64
2001 0.00 0.00 2.50 244.50 618.00 866.50 1103.08 a 996.50 622.50 291.00 218.50 5.00 4968.08
2002 4.00 11.50 2.00 259.00 465.50 978.00 1159.00 966.00 711.50 158.00 29.00 0.00 4743.50
2003 3.00 0.00 99.50 333.00 519.50 842.00 1052.00 1046.00 592.00 363.00 30.50 0.00 4880.50
2004 0.00 0.00 93.50 284.00 540.50 783.50 973.00 800.50 786.50 328.00 61.50 0.00 4651.00
2005 0.00 5.50 50.50 329.00 543.50 963.00 1074.50 965.00 809.50 353.50 89.00 0.00 5183.00
2006 4.00 0.00 28.50 353.50 631.00 893.00 1131.00 982.50 523.00 267.50 66.00 0.00 4880.00
2007 0.00 0.00 135.00 266.00 750.00 922.00 1081.00 1016.00 693.00 423.00 39.50 0.00 5325.50
2008 0.00 0.00 2.00 145.50 493.00 854.00 1036.00 949.00 666.50 289.50 93.00 0.00 4528.50
2009 0.00 2.00 63.00 190.00 574.00 827.50 878.00 863.50 694.50 112.50 105.00 0.00 4310.00
2010 0.00 0.00 52.00 404.00 578.50 878.50 1052.00 1079.50 626.50 395.00 64.50 0.00 5130.50
2011 0.00 0.00 a 18.50 156.00 564.00 840.00 c 1172.32 a 947.00 575.00 391.00 39.50 1.50 4704.82
2012 2.07 a 0.00 a 341.00 347.00 710.50 959.50 1218.00 968.00 646.00 205.00 38.50 3.00 5438.57
2013 0.00 0.00 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 0.00
Period of Record Statistics
MEAN 0.57 3.07 54.21 247.03 581.79 858.73 1043.09 966.23 657.19 316.89 49.18 1.79 4797.16
S.D. 1.96 7.08 56.29 93.42 110.72 91.43 88.17 86.92 95.56 97.70 37.98 5.55 351.31
SKEW 5.28 3.69 2.07 0.27 0.44 0.25 0.07 0.28 0.05 0.31 1.12 4.82 -0.08
MAX 16.00 46.00 341.00 469.50 928.50 1086.50 1335.50 1224.50 883.50 614.00 218.50 38.00 5620.50
MIN 0.00 0.00 0.00 41.50 339.00 671.00 782.00 755.00 434.50 105.50 0.00 0.00 3966.00
NO YRS 115 112 112 113 112 112 113 112 114 114 111 112 96