ARROWROCK DAM, IDAHO

Monthly Total Growing Degree Days

(100448)

Base Temperature = 40 F

File last updated on Apr 4, 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
1911 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 1.50 l 0.00 0.00
1912 1.00 3.00 73.00 270.50 545.50 852.00 913.00 859.00 493.50 275.50 90.00 1.50 4377.50
1913 1.50 2.00 57.50 346.50 633.50 777.00 954.00 1011.00 696.00 297.00 110.00 0.00 4886.00
1914 5.50 26.00 190.50 380.00 673.22 a 704.00 1087.50 1012.50 644.00 469.00 112.00 2.00 5306.22
1915 0.00 33.00 226.00 476.00 445.50 601.50 893.04 e 1077.00 0.00 z 0.00 z 84.00 27.26 b 3863.30
1916 2.00 1.50 116.50 393.00 0.00 z 298.50 r 943.95 a 918.24 b 85.50 z 231.95 c 35.36 b 1.11 c 2643.60
1917 0.00 y 2.50 15.00 129.83 a 402.47 b 638.00 1132.10 e 602.00 m 780.00 c 317.00 g 90.50 k 32.50 3132.39
1918 1.07 b 6.46 b 131.23 a 223.27 d 438.81 b 974.42 d 745.50 j 862.12 b 752.31 d 376.00 33.00 f 1.07 b 3766.76
1919 4.65 a 1.50 49.60 a 295.56 c 606.71 c 760.96 d 1114.34 c 1100.00 702.60 e 194.04 d 11.00 0.00 b 4840.96
1920 0.00 1.07 b 16.00 g 137.00 f 428.63 e 743.08 d 876.00 g 1029.95 b 679.00 280.03 a 39.64 b 0.00 3201.41
1921 8.50 8.00 82.48 c 95.50 j 486.50 799.82 b 1056.67 b 1069.50 d 374.00 h 220.50 l 77.68 b 2.00 3591.15
1922 0.00 b 0.00 19.00 132.86 b 459.12 b 881.50 1067.71 e 1077.50 757.50 b 436.00 15.58 d 0.00 d 4846.77
1923 3.21 b 0.00 44.90 b 245.89 b 493.50 624.50 1080.00 1014.96 d 752.88 d 284.34 b 28.93 b 0.00 4573.12
1924 0.00 18.26 b 24.36 c 185.50 g 726.50 755.36 b 825.50 g 993.79 e 709.04 d 352.07 c 50.56 c 0.00 g 3629.93
1925 0.00 1.68 c 90.33 b 301.50 616.79 b 739.82 b 1155.86 c 970.09 b 665.36 b 240.54 d 16.61 b 4.28 b 4802.84
1926 0.00 5.50 127.21 b 419.50 540.95 a 908.28 a 1167.09 d 1015.52 b 501.35 d 285.50 g 115.00 23.50 4823.89
1927 0.00 z 3.00 f 48.57 a 229.82 b 417.00 594.50 f 1071.10 b 984.00 590.00 403.60 e 59.00 h 0.00 f 3744.09
1928 0.00 0.00 b 73.07 c 171.00 689.50 659.42 d 1100.50 989.13 d 725.56 c 181.50 k 34.50 j 0.00 j 4408.18
1929 0.00 b 0.00 f 35.28 b 183.50 511.00 701.25 b 1022.43 d 1148.72 d 448.50 f 256.50 l 11.54 d 53.70 c 3667.41
1930 0.00 11.00 98.34 b 398.33 c 432.45 a 681.96 b 946.00 f 1056.67 b 450.00 j 273.04 e 25.50 h 0.00 b 2951.80
1931 0.00 a 0.00 b 33.50 j 267.22 c 616.00 869.42 d 1195.00 1113.33 b 1485.54 b 327.64 b 33.50 j 0.00 f 5874.15
1932 0.00 b 0.00 28.50 269.46 b 514.60 a 737.68 b 996.65 a 954.59 b 690.00 b 309.50 43.39 b 0.00 4544.37
1933 0.00 0.00 a 9.50 232.00 367.50 847.00 1129.00 1034.88 a 586.11 c 443.76 d 37.50 11.37 a 4698.62
1934 7.00 39.85 b 249.03 a 467.50 721.50 748.00 1163.02 a 1121.54 c 634.82 b 344.88 c 121.11 c 0.00 b 5618.24
1935 0.00 0.00 20.00 218.00 434.52 a 733.93 b 1019.00 979.00 766.61 b 372.00 c 0.00 d 0.00 4543.05
1936 0.00 0.00 a 0.00 a 341.50 617.93 a 498.00 i 1152.17 d 1047.50 627.32 b 372.00 3.62 a 0.00 b 4162.04
1937 0.00 b 0.00 a 42.50 152.07 a 572.47 a 694.66 a 280.00 w 954.80 a 751.03 a 352.07 c 57.00 10.50 3587.10
1938 0.00 c 8.30 a 17.10 b 277.00 455.38 b 756.43 b 1006.90 e 949.00 814.29 b 335.12 b 1.00 0.00 4620.52
1939 0.00 0.00 b 34.50 j 314.00 623.50 624.23 d 1062.02 b 1078.50 667.00 289.50 37.50 31.00 4727.25
1940 2.00 16.00 119.00 250.50 645.50 879.50 1090.50 1088.00 678.50 394.00 18.00 9.00 5190.50
1941 0.00 10.00 161.50 292.00 582.50 724.00 1098.50 985.59 b 525.00 275.00 84.50 26.00 4764.59
1942 1.50 0.50 24.50 258.50 351.50 616.00 1083.50 1015.50 684.50 337.00 24.00 0.00 4397.00
1943 0.00 0.00 41.50 347.50 391.00 603.00 1012.00 940.00 779.50 368.50 16.50 0.00 4499.50
1944 0.00 0.00 16.50 179.00 523.00 596.50 947.50 921.00 661.00 448.00 37.50 0.50 4330.50
1945 2.00 2.00 41.00 163.00 487.50 602.00 1039.00 984.50 566.50 413.00 33.50 4.50 4338.50
1946 0.00 0.00 63.50 317.00 484.50 718.50 1076.50 1015.00 608.00 164.00 21.50 20.50 4489.00
1947 0.00 7.50 136.00 265.00 652.00 628.50 1054.00 967.00 664.00 394.50 30.00 0.00 4798.50
1948 1.00 0.00 18.50 189.50 468.00 774.50 912.00 937.50 677.59 a 351.85 a 26.00 0.00 4356.44
1949 0.00 0.00 a 28.50 364.14 a 574.00 689.00 1010.50 1025.50 754.50 164.50 86.00 0.00 4696.64
1950 0.00 5.50 20.50 212.00 398.50 642.00 993.50 975.50 711.00 422.00 61.00 3.50 4445.00
1951 0.00 1.00 21.50 297.50 492.50 633.50 1068.97 b 966.50 668.50 241.50 12.50 4.50 4408.47
1952 0.00 c 0.00 17.00 329.50 519.00 698.00 960.00 1007.00 741.50 468.50 12.50 0.50 4753.50
1953 16.53 a 13.00 75.00 196.00 340.50 565.50 1041.08 a 959.00 753.10 a 380.00 134.50 0.00 4474.22
1954 2.50 14.00 27.00 261.35 d 590.00 580.00 1040.10 b 886.00 636.00 278.50 99.00 5.50 4419.95
1955 0.00 0.00 2.50 96.50 408.50 752.00 914.50 1075.00 645.00 340.50 13.50 7.00 4255.00
1956 3.00 7.50 84.50 268.45 a 536.50 697.00 1053.00 920.50 681.50 283.00 21.72 a 4.00 4560.67
1957 0.00 9.50 50.50 211.50 535.00 753.50 1047.50 1053.50 755.50 262.00 1.00 3.50 4683.00
1958 0.00 33.00 41.50 161.00 701.00 755.00 1031.00 1108.50 661.50 465.00 79.00 9.50 5046.00
1959 13.00 3.50 70.00 344.00 401.50 835.00 1117.00 944.50 587.00 322.00 25.00 0.00 4662.50
1960 0.00 1.50 109.50 302.50 464.00 825.00 1224.00 910.00 778.97 a 326.00 50.00 8.50 4999.97
1961 0.00 20.00 101.50 225.00 569.37 a 965.50 1134.00 1174.00 541.00 283.50 9.00 3.00 5025.87
1962 11.50 2.00 29.50 370.00 463.00 735.50 983.00 918.50 708.00 353.50 92.50 19.00 4686.00
1963 0.50 60.50 114.50 202.00 583.00 655.50 958.50 1005.00 820.50 501.50 86.00 0.00 4987.50
1964 0.00 0.00 11.00 158.00 440.00 645.50 1059.00 891.00 542.50 367.50 57.50 29.50 4201.50
1965 4.50 4.50 34.50 263.00 425.50 676.00 992.50 929.43 d 478.00 469.00 152.50 3.50 4432.93
1966 1.00 0.00 109.50 244.50 621.00 695.50 1026.50 974.00 781.00 253.50 91.50 4.00 4802.00
1967 1.50 10.50 55.50 79.50 464.00 689.00 1110.50 1111.50 788.50 250.00 78.00 1.00 4639.50
1968 0.00 14.50 112.00 148.50 453.00 719.00 1070.00 795.50 578.50 267.50 19.50 9.00 4187.00
1969 2.00 0.00 58.00 263.50 592.50 726.50 981.50 995.00 666.50 143.50 54.50 4.00 4487.50
1970 3.50 12.50 29.00 69.50 448.50 757.00 981.00 1025.50 441.00 197.50 43.00 0.00 4008.00
1971 0.50 3.50 24.00 177.50 492.50 645.50 998.50 1133.00 489.00 254.00 25.50 3.00 4246.50
1972 0.00 2.50 98.50 163.50 527.00 757.50 965.00 1034.00 496.00 325.00 35.00 6.50 4410.50
1973 2.50 21.00 58.50 194.00 549.00 724.00 1050.50 977.50 594.50 298.00 47.00 5.00 4521.50
1974 7.00 1.00 45.00 168.50 390.50 855.00 990.50 937.00 688.50 345.00 39.00 2.50 4469.50
1975 0.00 0.00 4.50 58.50 356.50 614.00 1110.50 839.00 679.50 287.50 54.50 0.00 4004.50
1976 0.00 4.50 4.50 142.50 534.50 608.50 1012.00 0.00 z 638.50 268.00 89.00 0.00 3302.00
1977 0.00 4.50 18.50 332.00 309.00 853.50 950.50 969.00 580.50 288.00 25.00 8.00 4338.50
1978 2.50 4.00 176.00 181.50 382.00 656.50 964.50 889.00 550.50 366.50 44.00 0.00 4217.00
1979 0.00 7.50 57.50 174.00 499.00 737.50 1023.50 968.50 797.50 451.50 28.00 2.00 4746.50
1980 1.03 a 42.00 34.50 328.00 482.50 634.50 1009.00 845.00 637.00 336.00 78.50 5.50 4433.53
1981 2.50 26.50 90.00 254.00 437.00 640.00 962.00 1083.50 703.50 219.00 105.50 11.00 4534.50
1982 0.00 0.50 29.50 143.50 406.00 740.00 910.50 1034.00 613.00 272.00 10.50 2.50 4162.00
1983 5.50 43.50 113.50 166.50 471.00 666.00 872.50 1059.68 a 619.00 356.00 117.50 0.00 4490.68
1984 0.00 0.00 40.50 157.00 409.50 599.00 1009.50 1041.00 550.00 251.50 12.93 a 0.00 4070.93
1985 0.00 0.00 10.00 315.50 543.00 798.50 481.00 s 623.50 j 455.69 a 146.00 i 28.50 0.00 2151.19
1986 2.00 31.50 168.50 197.00 493.00 901.00 887.50 1103.00 491.50 321.07 c 23.00 k 0.00 4596.07
1987 0.00 2.50 75.50 412.00 648.50 829.50 656.50 j 546.00 l 524.00 i 275.00 j 63.50 k 8.00 o 1968.00
1988 0.00 l 12.83 c 64.58 a 332.50 516.00 846.50 1051.00 947.05 a 588.62 a 552.00 60.00 0.00 4971.08
1989 0.00 0.00 56.50 329.50 455.00 792.00 1098.50 895.50 665.50 307.50 28.50 0.00 4628.50
1990 13.50 0.00 a 103.50 390.50 408.68 a 722.07 a 1054.50 999.50 833.50 278.50 30.00 0.00 4834.25
1991 0.00 19.50 49.50 164.50 363.00 611.50 1012.50 1044.00 691.50 345.00 23.50 0.00 4324.50
1992 4.50 32.50 219.00 351.00 664.00 840.00 909.50 1010.00 630.00 447.50 11.00 1.00 5120.00
1993 0.00 2.00 71.50 175.00 649.50 593.00 731.50 856.50 661.00 365.50 31.00 13.00 4149.50
1994 0.00 6.00 151.50 332.00 597.00 786.50 1113.00 1112.00 796.00 281.50 10.00 0.00 5185.50
1995 7.75 a 69.48 a 52.50 214.00 452.00 650.50 975.00 897.50 707.50 274.50 94.50 20.00 n 4395.23
1996 0.00 j 10.00 107.00 261.00 424.50 747.41 a 1076.00 1006.00 0.00 z 114.00 q 70.50 5.50 i 3702.41
1997 7.50 2.00 k 99.50 l 249.00 452.50 h 787.00 978.50 1057.88 c 785.50 302.50 53.50 0.00 4221.38
1998 6.50 25.50 111.50 226.03 a 435.55 a 607.76 a 1126.00 1062.00 578.50 i 277.50 51.50 16.50 3946.34
1999 0.00 h 2.50 164.50 467.50 672.50 547.50 f 948.08 a 1049.87 a 627.00 390.71 b 171.96 b 9.19 d 4503.81
2000 0.00 l 10.00 f 98.17 a 352.50 b 511.00 f 770.00 c 1086.07 b 829.50 h 677.14 b 151.50 n 2.00 h 0.00 e 2983.88
2001 0.00 p 5.00 l 128.17 e 185.00 f 625.37 e 756.35 d 999.00 1123.75 a 742.50 b 256.78 a 100.86 a 0.00 4732.78
2002 0.00 i 1.00 30.50 i 268.50 0.00 z 829.20 e 926.50 g 934.17 e 486.50 i 310.60 e 58.50 22.00 2423.97
2003 23.00 11.50 i 85.00 j 272.50 500.50 802.80 e 1218.50 1119.00 756.00 517.50 34.00 19.00 5262.80
2004 0.00 g 10.00 210.00 313.50 f 530.00 767.50 1097.00 1019.26 b 653.50 381.50 2.00 l 0.00 l 4668.76
2005 0.00 b 1.50 100.00 197.50 552.50 687.50 1171.00 1126.00 695.00 0.00 z 0.00 z 0.00 z 4531.00
2006 0.00 z 0.00 z 0.00 z 306.50 625.50 887.50 0.00 z 0.00 z 673.50 0.00 z 122.50 5.50 2621.00
2007 0.00 25.50 227.00 304.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 m 556.50
2008 0.00 0.00 2.50 128.00 541.00 704.50 1119.00 1087.00 720.00 0.00 z 0.00 z 0.00 z 4302.00
2009 0.00 z 8.50 59.00 239.50 557.50 726.00 1094.00 1035.00 865.50 273.50 0.00 z 0.00 z 4858.50
2010 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
2011 0.55 c 18.00 41.50 115.00 414.88 a 621.50 995.00 1132.00 841.50 400.00 17.00 10.00 4606.94
2012 0.00 a 5.50 124.00 339.83 a 490.50 721.00 1177.50 1121.00 783.00 334.50 130.50 34.62 a 5261.94
2013 0.00 2.00 116.50 14.50 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 118.50
Period of Record Statistics
MEAN 2.08 9.21 74.49 253.13 510.35 728.06 1037.13 1005.12 677.93 330.02 52.44 6.28 4600.67
S.D. 4.02 13.53 58.00 91.91 96.25 92.13 85.14 80.89 128.28 81.70 39.37 10.02 331.75
SKEW 2.85 2.19 1.04 0.23 0.27 0.42 -0.36 -0.20 2.56 0.32 0.85 2.26 0.64
MAX 23.00 69.48 249.03 476.00 726.50 974.42 1224.00 1174.00 1485.54 552.00 171.96 53.70 5618.24
MIN 0.00 0.00 0.00 58.50 309.00 565.50 731.50 795.50 441.00 143.50 0.00 0.00 4004.50
NO YRS 90 94 94 95 95 95 90 93 90 86 86 89 64