NORTHWOOD, IOWA

Monthly Total Growing Degree Days

(136103)

Base Temperature = 40 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 369.00 704.00 817.50 909.50 855.17 b 471.00 238.50 9.50 8.50 4382.67
1897 0.00 0.00 21.00 170.00 473.50 755.00 1016.50 777.00 798.00 401.50 29.50 0.00 4442.00
1898 0.00 0.00 36.00 160.56 c 548.50 848.50 956.50 901.00 666.00 194.50 25.50 0.00 d 4337.06
1899 0.00 0.50 0.00 288.00 523.00 829.50 961.50 1008.00 585.00 408.00 87.00 0.00 4690.50
1900 0.00 0.00 7.00 392.00 693.50 844.50 939.50 1094.00 620.00 513.50 33.00 0.00 5137.00
1901 0.00 d 0.00 14.00 315.50 597.00 865.50 1231.00 988.00 612.50 375.50 20.00 0.00 c 5019.00
1902 0.00 2.50 90.00 208.00 649.50 689.50 938.50 814.50 516.50 320.50 72.00 0.00 4301.50
1903 0.00 0.00 44.50 220.00 625.50 700.50 912.00 805.50 541.50 308.00 68.00 0.00 4225.50
1904 0.00 0.00 0.00 z 147.50 544.00 744.00 903.50 796.00 664.50 131.00 o 87.50 0.00 3887.00
1905 0.00 0.00 z 89.00 170.50 500.50 819.00 908.00 1003.50 699.00 247.50 31.50 0.00 4468.50
1906 0.00 b 0.00 0.00 304.00 559.00 770.00 896.00 1027.02 d 559.50 g 270.00 55.00 0.00 a 3881.02
1907 0.00 0.00 97.65 a 59.50 333.50 713.04 b 998.64 c 889.18 a 618.60 e 250.00 18.75 b 5.68 a 3984.55
1908 0.00 z 0.00 a 27.26 b 246.50 558.00 747.93 a 969.94 e 841.65 a 792.00 312.00 72.69 d 0.00 j 4567.97
1909 0.50 0.00 0.00 f 77.88 d 427.50 f 798.50 664.50 i 350.50 u 621.92 d 255.50 110.50 3.50 1868.31
1910 0.00 d 0.00 222.50 367.22 c 415.73 c 916.80 e 824.50 f 917.00 611.50 388.00 0.50 0.00 3839.25
1911 0.00 e 0.00 i 22.50 g 0.00 z 693.50 0.00 z 0.00 z 847.00 629.46 b 214.79 c 2.50 0.50 2387.75
1912 0.00 0.00 c 0.00 248.50 575.00 684.00 967.00 848.50 571.50 261.71 e 37.00 0.50 4193.71
1913 0.00 3.50 23.50 241.50 487.73 a 886.50 943.90 b 998.00 643.50 276.00 87.50 10.00 4601.63
1914 0.00 a 0.00 8.00 223.00 558.00 839.44 c 1048.50 951.81 d 630.00 422.00 88.00 0.00 4768.76
1915 0.00 0.00 0.50 457.50 406.00 668.00 839.00 744.50 618.50 337.50 71.00 0.00 4142.50
1916 0.00 0.00 33.00 163.50 524.00 673.50 1153.50 970.50 616.11 c 166.50 j 29.40 e 5.88 b 4169.39
1917 0.00 0.00 17.00 126.00 342.50 f 0.00 z 761.50 h 795.31 b 555.50 84.50 f 56.50 i 0.00 h 1493.81
1918 0.00 2.50 77.50 99.83 a 663.50 0.00 z 0.00 z 0.00 z 436.50 325.50 a 89.00 0.50 l 1694.33
1919 0.00 0.00 37.95 b 152.00 0.00 z 828.33 c 744.50 g 510.50 j 612.00 0.00 z 0.00 z 0.00 b 1630.28
1920 0.00 k 0.00 c 68.50 83.50 528.00 844.00 944.31 e 823.50 683.50 451.00 11.67 c 0.00 4437.97
1921 0.00 4.00 63.55 a 315.00 655.65 a 971.40 e 1149.67 b 720.00 g 709.82 b 336.23 e 6.35 d 0.00 d 4211.67
1922 0.00 0.00 b 16.50 175.56 c 670.63 a 897.50 911.40 a 1001.00 724.50 455.46 e 67.78 c 0.00 4920.33
1923 0.00 0.00 b 12.00 196.50 560.14 b 912.22 c 1106.70 a 684.00 f 627.00 220.58 e 33.89 c 1.00 f 3669.03
1924 0.00 t 0.00 n 0.00 m 122.00 i 281.14 b 696.67 c 855.00 838.79 e 363.00 h 425.98 b 28.50 i 0.00 c 3097.58
1925 0.00 a 0.00 r 34.00 i 229.00 n 383.00 i 557.50 i 761.00 f 692.50 h 753.50 99.95 b 14.50 0.00 m 867.95
1926 0.00 l 0.00 g 13.50 j 180.00 493.00 h 708.00 e 974.43 a 936.31 d 566.50 251.21 b 24.00 0.00 3640.45
1927 0.00 0.00 b 39.00 12.50 z 0.00 z 526.00 i 924.46 c 795.67 d 709.29 b 229.00 g 0.00 z 0.00 z 2468.42
1928 0.00 z 0.00 z 65.62 a 130.00 647.00 680.00 981.50 895.00 541.00 343.50 36.00 0.00 4319.62
1929 0.00 a 0.00 28.00 252.00 460.00 344.00 q 999.75 a 921.00 599.50 285.72 a 8.50 0.00 3554.47
1930 0.00 35.00 6.50 j 281.00 556.00 805.50 1071.50 1020.50 655.00 331.00 140.00 0.00 4895.50
1931 0.50 6.00 1.00 301.50 474.50 991.50 1107.50 982.50 854.00 439.50 122.68 b 0.00 5281.18
1932 0.00 0.00 8.50 208.50 611.00 900.50 1019.00 950.50 578.50 250.50 23.50 2.00 4552.50
1933 0.00 0.00 23.50 197.00 555.50 1051.50 1065.00 879.00 792.00 231.50 39.50 0.50 4835.00
1934 0.00 0.00 25.50 209.00 871.00 1008.50 1095.50 885.50 530.00 414.88 a 78.50 0.00 5118.38
1935 0.00 0.00 83.00 171.00 418.00 688.00 1124.00 930.52 a 684.50 288.50 13.00 0.00 4400.52
1936 0.00 0.00 32.00 166.00 723.50 771.00 1229.50 1062.50 728.50 258.00 14.50 11.50 4997.00
1937 0.00 0.00 7.00 186.00 570.00 757.00 1035.00 1083.50 675.50 257.50 48.50 0.00 4620.00
1938 0.00 0.00 111.08 a 281.50 489.50 774.50 1026.10 a 982.50 718.50 479.50 75.00 0.00 a 4938.18
1939 0.00 0.00 87.50 191.00 717.50 853.00 1040.00 898.00 755.00 318.50 55.00 28.00 4943.50
1940 0.00 0.00 12.50 162.00 501.00 845.50 1064.50 846.50 705.50 444.50 40.50 1.00 4623.50
1941 0.00 0.00 10.00 348.00 718.50 831.00 1001.50 973.00 689.00 376.50 73.00 12.00 5032.50
1942 0.00 0.00 39.50 364.50 506.00 780.00 931.50 889.50 554.00 380.00 60.00 0.00 4505.00
1943 0.00 0.00 64.50 176.00 456.50 863.50 1003.50 929.00 502.00 307.50 0.50 0.50 4303.50
1944 21.00 0.00 0.00 137.00 707.50 874.00 903.50 923.00 640.50 351.00 98.00 0.00 4655.50
1945 0.00 0.00 198.00 181.50 384.00 640.50 883.00 898.50 586.00 298.50 52.50 0.00 4122.50
1946 0.00 0.00 180.50 332.50 429.00 814.50 963.50 813.00 582.50 397.00 15.50 16.00 4544.00
1947 0.00 0.00 7.00 122.50 386.00 686.50 872.00 1134.50 721.50 584.50 41.50 0.00 4556.00
1948 0.00 z 0.00 z 0.00 z 302.40 e 497.00 746.50 1005.50 980.00 772.50 314.00 55.00 g 5.00 4622.90
1949 0.00 j 0.00 9.30 a 239.00 676.50 931.50 1073.00 995.00 541.50 444.50 90.52 a 3.00 5003.82
1950 0.00 0.00 2.50 82.50 492.38 a 792.50 867.50 808.58 a 616.00 206.00 n 41.00 0.00 b 3702.97
1951 0.00 d 0.00 0.00 116.38 a 662.33 e 401.50 m 0.00 z 0.00 z 532.50 345.28 b 28.00 11.37 a 1695.85
1952 0.00 0.00 12.00 285.50 514.60 a 935.00 968.50 773.00 582.78 c 193.75 e 28.50 k 0.00 c 4265.13
1953 0.00 d 0.00 l 27.42 e 49.00 h 329.50 i 934.04 d 700.00 i 948.50 165.50 v 340.00 j 71.50 n 0.00 i 1909.96
1954 0.00 g 16.59 a 0.00 z 325.34 a 422.12 a 694.50 f 526.50 p 923.00 687.86 b 292.00 51.00 k 0.00 z 2666.91
1955 0.00 a 0.00 e 19.93 c 406.03 a 682.52 a 767.59 a 1157.91 d 1119.50 727.24 a 365.28 a 8.28 a 0.00 e 5254.27
1956 0.00 b 0.00 z 0.00 c 125.56 c 502.50 f 1012.20 e 905.56 e 943.43 a 580.50 490.00 77.07 a 0.00 4134.32
1957 0.00 a 0.00 c 9.19 d 300.50 547.50 823.97 a 1138.50 955.50 588.00 267.50 26.50 0.00 4657.15
1958 0.00 14.00 14.50 235.00 644.00 717.50 918.00 989.00 695.50 431.00 97.50 0.00 4756.00
1959 0.00 0.00 a 15.00 241.00 666.50 c 900.50 977.50 1096.50 655.50 194.50 12.50 5.00 4764.50
1960 0.00 0.00 7.00 272.00 580.00 792.50 982.50 994.00 695.50 350.50 50.00 3.50 4727.50
1961 0.00 0.00 10.00 101.50 502.00 881.50 954.50 665.50 j 621.50 390.00 32.00 5.00 3498.00
1962 0.00 0.00 7.00 212.00 732.50 858.50 931.00 933.00 560.00 419.50 42.00 38.50 4734.00
1963 0.00 0.00 a 116.50 290.00 575.00 956.00 1011.00 907.00 713.50 642.50 84.00 0.00 5295.50
1964 0.00 0.50 10.50 243.50 748.50 890.00 1119.50 907.00 628.50 300.00 162.50 0.00 5010.50
1965 0.00 0.00 0.00 151.00 670.50 853.00 984.50 908.00 482.00 387.00 64.00 7.00 4507.00
1966 0.00 6.00 98.00 120.00 475.00 870.50 1086.00 873.00 624.00 324.50 40.50 0.00 4517.50
1967 0.00 0.00 88.00 239.50 455.00 838.00 916.50 825.00 599.00 295.00 28.00 0.00 4284.00
1968 0.00 0.00 162.50 293.50 443.00 864.00 955.00 943.00 632.50 362.50 23.50 8.00 4687.50
1969 0.00 0.00 0.00 260.00 618.50 641.50 1018.00 992.50 670.50 237.50 52.50 0.00 4491.00
1970 0.00 0.00 1.00 252.50 649.50 902.50 1022.50 961.00 644.50 314.00 16.00 4.50 4768.00
1971 0.00 0.00 16.00 284.50 501.50 1003.00 912.00 927.50 525.50 i 460.87 a 62.00 0.00 4167.37
1972 0.00 0.00 23.00 165.50 673.50 828.50 949.50 962.00 634.50 249.00 18.50 0.00 4504.00
1973 0.00 0.00 z 85.00 197.50 511.00 930.00 1036.50 1011.50 651.00 492.50 35.50 1.50 4952.00
1974 0.00 0.00 18.50 290.00 503.00 807.50 1144.50 875.00 557.00 368.50 43.00 0.00 4607.00
1975 0.00 0.00 0.00 a 132.00 705.50 875.00 1074.00 1022.50 569.00 451.50 150.00 3.00 4982.50
1976 0.00 19.00 88.00 350.00 573.00 912.50 1087.00 980.50 662.50 234.50 18.00 0.00 4925.00
1977 0.00 2.50 134.00 479.50 880.00 932.50 1115.50 868.00 700.50 258.00 89.50 0.00 5460.00
1978 0.00 0.00 63.00 213.00 647.50 890.50 991.00 979.50 806.00 301.00 97.00 0.00 4988.50
1979 0.00 0.00 0.00 168.50 560.50 859.50 999.00 930.00 698.00 289.00 29.50 1.00 4535.00
1980 0.00 0.00 10.00 293.50 684.50 905.00 1078.50 981.50 719.00 233.00 70.50 0.00 4975.50
1981 3.50 47.50 95.00 369.00 558.50 884.50 1038.00 926.50 616.50 247.00 103.00 0.00 4889.00
1982 0.00 0.00 19.50 194.50 667.00 722.00 1053.00 921.50 633.50 332.50 31.00 19.00 4593.50
1983 0.00 0.00 45.50 132.50 455.50 878.00 1123.50 1104.00 674.00 327.64 b 85.50 0.00 4826.14
1984 0.00 1.50 0.00 190.00 557.00 908.00 974.50 1052.50 626.00 385.00 33.50 4.50 4732.50
1985 0.00 1.50 73.50 429.50 772.00 794.00 1012.00 870.50 651.00 308.50 14.50 0.00 4927.00
1986 0.00 0.00 112.00 340.00 650.00 953.50 1088.50 852.00 691.00 334.00 12.00 0.00 5033.00
1987 0.00 2.50 101.00 443.50 811.50 1017.50 1141.83 a 864.50 634.00 162.00 96.00 0.00 5274.33
1988 0.00 0.00 35.50 225.00 782.00 1044.50 1100.50 1085.50 733.50 191.00 28.50 0.00 5226.00
1989 0.00 0.00 49.00 198.00 538.50 794.50 1039.50 917.50 571.00 330.50 9.50 0.00 4448.00
1990 0.00 0.00 76.00 232.50 446.50 847.50 931.50 918.50 708.50 239.50 90.00 0.00 4490.50
1991 0.00 0.00 41.50 243.00 641.50 964.00 963.50 910.00 552.00 238.50 2.00 0.00 4556.00
1992 0.00 0.00 35.00 113.00 579.50 751.50 764.50 746.50 529.00 264.00 6.50 0.00 3789.50
1993 0.00 0.00 3.00 116.00 479.00 734.00 904.00 888.50 422.00 221.00 10.00 0.00 3777.50
1994 0.00 0.00 30.50 250.34 a 585.00 359.00 p 598.50 i 804.50 686.50 345.00 53.00 0.00 2754.84
1995 0.00 0.00 54.00 99.50 458.00 882.50 982.00 1040.00 529.50 257.50 0.00 0.00 4303.00
1996 0.00 2.00 12.00 116.00 412.00 808.50 892.50 844.00 557.50 276.50 3.00 0.00 z 3924.00
1997 0.00 0.00 21.50 131.50 323.50 834.50 905.20 a 784.00 596.00 318.00 8.00 0.00 3922.20
1998 0.00 2.50 59.50 244.00 712.00 715.34 a 916.00 0.00 z 724.00 270.50 42.00 33.00 3718.84
1999 0.00 d 0.00 a 31.53 b 188.28 a 582.69 d 775.71 b 1022.45 c 841.00 547.50 238.50 103.50 4.50 4335.66
2000 0.00 26.41 a 131.50 215.50 589.52 a 742.50 917.60 a 876.50 599.48 a 361.84 b 39.11 b 0.00 4499.96
2001 0.00 0.00 a 0.00 288.62 a 561.00 789.00 966.00 913.50 517.00 237.00 208.00 21.00 4501.12
2002 2.50 4.50 8.50 226.00 440.50 868.50 1048.50 857.50 671.00 168.50 14.00 0.00 4310.00
2003 3.50 1.00 71.50 264.50 494.00 751.50 930.00 945.50 591.50 309.50 27.00 1.00 4390.50
2004 0.00 0.50 74.00 245.50 501.50 726.00 872.00 691.50 697.00 325.50 69.50 0.00 4203.00
2005 0.00 0.00 q 47.50 322.50 436.00 917.50 978.50 853.50 713.50 338.50 82.50 0.00 4690.00
2006 0.00 0.00 20.50 311.50 563.50 794.50 1027.50 890.00 494.50 203.50 56.50 1.19 e 4363.19
2007 0.00 0.00 100.75 a 233.00 671.50 836.00 940.50 896.50 637.00 394.00 28.80 e 0.00 a 4738.05
2008 0.00 d 0.00 l 1.50 f 134.00 462.00 775.50 915.00 810.00 605.00 248.50 99.00 0.00 4049.00
2009 0.00 0.00 43.00 170.50 274.50 k 769.80 e 776.55 a 769.50 649.50 133.50 85.50 0.00 3397.85
2010 0.00 a 0.00 a 37.50 354.50 558.00 374.00 p 996.50 1003.00 582.00 351.50 56.50 0.00 3939.50
2011 0.00 d 0.00 1.00 158.57 b 496.52 a 815.56 c 1087.50 917.50 551.67 c 329.00 j 14.50 u 0.00 4028.31
2012 0.00 1.50 330.00 261.50 695.36 b 852.32 b 1109.05 b 676.50 g 590.00 213.00 68.89 c 13.00 4134.62
2013 0.00 0.00 e 1.03 a 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 1.03
Period of Record Statistics
MEAN 0.29 1.94 45.24 229.18 569.32 830.73 995.99 918.47 632.12 319.91 50.71 2.77 4644.73
S.D. 2.07 6.78 53.61 89.54 115.25 92.48 89.90 89.12 80.37 92.68 38.66 6.63 359.46
SKEW 9.38 4.80 2.29 0.49 0.19 0.13 0.21 0.13 0.05 0.59 1.12 3.37 -0.09
MAX 21.00 47.50 330.00 479.50 880.00 1051.50 1231.00 1134.50 854.00 642.50 208.00 38.50 5460.00
MIN 0.00 0.00 0.00 59.50 281.14 640.50 764.50 691.50 422.00 99.95 0.00 0.00 3777.50
NO YRS 109 105 107 112 108 107 106 107 113 109 108 108 75