ARROWROCK DAM, IDAHO

Monthly Total Growing Degree Days

(100448)

Base Temperature = 50 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 0.00 l 0.00 0.00
1912 0.00 0.00 0.00 52.00 246.50 555.00 603.00 549.00 197.00 54.50 7.00 0.00 2264.00
1913 0.00 0.00 0.50 119.50 330.50 477.00 644.00 701.00 398.00 78.50 1.50 0.00 2750.50
1914 0.00 0.00 6.50 103.50 363.22 a 411.00 777.50 702.50 349.50 170.50 13.00 0.00 2897.22
1915 0.00 0.00 22.50 184.50 157.00 301.50 583.04 e 767.00 0.00 z 0.00 z 5.50 0.00 b 2021.04
1916 0.00 0.00 0.00 119.50 0.00 z 181.50 r 633.95 a 608.24 b 45.50 z 31.55 c 1.07 b 0.00 c 1394.32
1917 0.00 y 0.00 0.00 6.72 a 124.53 b 354.00 822.10 e 422.00 m 480.00 c 116.50 g 4.50 k 0.00 1787.35
1918 0.00 b 0.00 b 8.27 a 41.54 d 155.53 b 674.42 d 535.50 j 553.72 b 452.88 d 141.00 0.00 f 0.00 b 2027.37
1919 0.00 a 0.00 0.52 a 92.22 c 331.59 c 465.58 d 804.34 c 790.00 402.60 e 20.67 d 0.00 0.00 b 2907.51
1920 0.00 0.00 b 0.00 g 10.00 f 140.69 e 443.08 d 636.00 g 719.95 b 389.00 110.57 a 0.00 b 0.00 1803.28
1921 0.00 0.00 0.00 c 6.50 j 183.00 499.82 b 746.67 b 759.50 d 156.50 h 64.00 l 0.54 b 0.00 2189.53
1922 0.00 b 0.00 0.00 10.18 b 184.93 b 581.50 757.71 e 767.50 458.04 b 159.00 0.00 d 0.00 d 2918.86
1923 0.00 b 0.00 0.53 b 41.25 b 197.00 324.50 770.00 704.96 d 454.62 d 59.33 b 0.00 b 0.00 2552.19
1924 0.00 0.00 b 0.00 c 35.50 g 419.50 456.43 b 585.50 g 683.79 e 418.85 d 110.16 c 2.22 c 0.00 g 2090.95
1925 0.00 0.00 c 6.41 b 83.00 309.47 b 441.96 b 845.86 c 660.09 b 367.50 b 10.33 d 0.00 b 0.00 b 2724.62
1926 0.00 0.00 8.55 b 162.50 249.03 a 608.28 a 857.09 d 705.52 b 235.96 d 90.50 g 0.00 0.00 2826.93
1927 0.00 z 0.00 f 0.00 a 76.61 b 142.00 354.50 f 761.10 b 674.00 297.00 145.46 e 0.00 h 0.00 f 2096.17
1928 0.00 0.00 b 6.09 c 36.50 391.50 361.15 d 790.50 679.13 d 433.33 c 43.00 k 0.00 j 0.00 j 2698.21
1929 0.00 b 0.00 f 0.00 b 19.50 222.50 401.25 b 712.43 d 838.72 d 219.50 f 83.00 l 0.00 d 0.00 c 2194.40
1930 0.00 0.00 1.60 b 141.11 c 163.78 a 385.71 b 696.00 f 746.67 b 252.50 j 50.67 e 0.00 h 0.00 b 1489.56
1931 0.00 a 0.00 b 0.00 j 62.78 c 326.00 569.42 d 885.00 803.33 b 1193.04 b 68.95 b 1.00 j 0.00 f 3908.51
1932 0.00 b 0.00 1.00 53.57 b 222.68 a 447.32 b 686.65 a 644.59 b 390.00 b 118.50 0.00 b 0.00 2564.31
1933 0.00 0.00 a 0.00 68.00 122.50 547.00 819.00 724.88 a 296.67 c 169.35 d 0.00 0.00 a 2747.40
1934 0.00 0.00 b 38.75 a 199.00 413.00 448.00 853.02 a 811.54 c 361.07 b 104.62 c 11.11 c 0.00 b 3240.11
1935 0.00 0.00 0.00 49.00 164.30 a 433.93 b 709.00 669.00 466.61 b 150.57 c 0.00 d 0.00 2642.41
1936 0.00 0.00 a 0.00 a 123.50 329.63 a 291.00 i 842.17 d 737.50 333.21 b 118.00 0.00 a 0.00 b 2484.01
1937 0.00 b 0.00 a 0.00 38.79 a 264.53 a 394.66 a 200.00 w 644.80 a 454.14 a 90.23 c 0.00 0.00 1887.15
1938 0.00 c 0.00 a 0.00 b 59.50 194.55 b 456.43 b 696.90 e 639.00 514.29 b 78.57 b 0.00 0.00 2639.24
1939 0.00 0.00 b 0.00 j 83.50 315.00 328.85 d 752.02 b 768.50 367.00 45.00 0.00 1.50 2661.36
1940 0.00 0.00 6.00 36.00 340.00 579.50 780.50 778.00 389.50 126.00 0.00 0.00 3035.50
1941 0.00 0.00 13.50 66.50 274.00 425.00 788.50 675.59 b 225.50 39.00 4.00 0.00 2511.59
1942 0.00 0.00 0.00 59.50 114.00 316.00 773.50 705.50 388.00 98.50 0.00 0.00 2455.00
1943 0.00 0.00 2.50 94.50 143.50 311.00 702.00 630.00 479.50 160.00 0.00 0.00 2523.00
1944 0.00 0.00 0.00 19.50 230.50 300.50 637.50 611.00 365.50 141.00 0.00 0.00 2305.50
1945 0.00 0.00 0.00 33.00 190.50 308.00 729.00 674.50 281.50 170.00 0.00 0.00 2386.50
1946 0.00 0.00 1.50 108.00 184.50 418.50 766.50 705.00 311.00 23.50 0.00 0.00 2518.50
1947 0.00 0.00 7.50 66.50 344.50 328.50 744.00 657.00 371.50 145.50 7.50 0.00 2672.50
1948 0.00 0.00 0.00 38.00 210.50 474.50 602.00 627.50 386.38 a 131.75 a 0.00 0.00 2470.63
1949 0.00 0.00 a 0.00 114.31 a 280.50 389.50 700.50 715.50 456.00 23.00 2.00 0.00 2681.31
1950 0.00 0.00 0.00 34.00 146.50 353.50 683.50 665.50 423.00 139.00 0.00 0.00 2445.00
1951 0.00 0.00 0.00 55.00 211.00 337.50 758.97 b 656.50 368.50 67.50 0.00 0.00 2454.97
1952 0.00 c 0.00 0.00 105.00 213.00 398.00 650.00 697.00 441.50 167.50 0.00 0.00 2672.00
1953 0.00 a 0.00 2.00 59.50 97.50 267.00 731.08 a 649.00 453.10 a 137.00 3.50 0.00 2399.69
1954 0.00 0.00 0.00 43.85 d 313.50 293.50 730.10 b 576.00 352.50 80.00 8.50 0.00 2397.95
1955 0.00 0.00 0.00 9.00 150.50 452.00 614.50 765.00 358.50 115.00 0.00 0.00 2464.50
1956 0.00 0.00 5.50 77.59 a 254.50 397.00 743.00 610.50 386.00 99.00 0.00 a 0.00 2573.09
1957 0.00 0.00 0.00 23.00 228.50 453.50 737.50 743.50 456.00 71.50 0.00 0.00 2713.50
1958 0.00 0.00 0.00 19.00 399.00 455.00 721.00 798.50 372.00 190.00 4.00 0.00 2958.50
1959 0.00 0.00 0.00 95.50 122.00 535.00 807.00 634.50 301.50 78.50 0.00 0.00 2574.00
1960 0.00 0.00 12.00 80.50 184.00 525.00 914.00 600.00 478.97 a 98.50 4.00 0.00 2896.97
1961 0.00 0.00 3.50 45.50 277.45 a 665.50 824.00 864.00 257.00 93.00 0.00 0.00 3029.95
1962 0.00 0.00 0.00 124.00 164.50 439.00 673.00 608.50 409.50 72.50 1.50 0.00 2492.50
1963 0.00 0.00 13.00 49.00 287.50 355.50 648.50 695.00 520.50 244.00 3.50 0.00 2816.50
1964 0.00 0.00 0.00 25.50 177.00 345.50 749.00 583.00 246.00 114.00 1.50 0.00 2241.50
1965 0.00 0.00 1.00 57.50 162.50 377.00 682.50 619.43 d 206.50 181.50 11.50 0.00 2299.43
1966 0.00 0.00 18.50 55.00 325.50 396.50 716.50 664.00 481.00 44.00 4.50 0.00 2705.50
1967 0.00 0.00 0.00 0.00 204.50 389.00 800.50 801.50 489.00 46.50 3.50 0.00 2734.50
1968 0.00 0.00 3.50 23.50 172.50 419.00 760.00 485.50 301.50 52.50 0.00 0.00 2218.00
1969 0.00 0.00 7.50 52.00 306.00 427.00 671.50 685.00 366.50 13.50 1.50 0.00 2530.50
1970 0.00 0.00 0.00 5.50 187.00 457.00 671.00 715.50 183.00 58.50 1.00 0.00 2278.50
1971 0.00 0.00 0.00 7.00 206.50 346.00 688.50 823.00 216.50 91.00 0.00 0.00 2378.50
1972 0.00 0.00 7.50 14.00 238.50 457.50 655.00 724.00 237.00 80.50 0.00 0.00 2414.00
1973 0.00 0.00 0.00 22.50 250.50 429.50 740.50 667.50 297.50 89.00 3.50 0.00 2500.50
1974 0.00 0.00 0.00 25.50 143.50 555.00 680.50 627.00 388.50 82.00 0.00 0.00 2502.00
1975 0.00 0.00 0.00 1.00 117.50 314.50 800.50 529.00 379.50 92.50 5.50 0.00 2240.00
1976 0.00 0.00 0.00 11.50 226.00 311.00 702.00 0.00 z 338.50 75.00 0.00 0.00 1664.00
1977 0.00 0.00 0.00 127.50 80.50 553.50 640.50 659.00 301.50 62.50 0.00 0.00 2425.00
1978 0.00 0.00 34.50 26.50 117.00 358.50 654.50 579.00 265.50 103.00 0.50 0.00 2139.00
1979 0.00 0.00 0.00 28.50 232.50 440.00 713.50 658.50 497.50 192.00 0.00 0.00 2762.50
1980 0.00 a 0.00 0.00 128.00 211.00 340.00 699.00 535.00 339.00 127.00 4.50 0.00 2383.50
1981 0.00 0.00 0.00 72.50 161.00 342.50 652.00 773.50 409.00 18.50 1.00 0.00 2430.00
1982 0.00 0.00 0.00 25.50 138.50 441.00 600.50 724.00 324.00 69.00 0.00 0.00 2322.50
1983 0.00 0.00 6.50 31.00 210.50 366.00 562.50 749.68 a 324.00 82.50 23.50 0.00 2356.18
1984 0.00 0.00 0.50 26.50 153.00 304.00 699.50 731.00 275.50 106.50 0.00 a 0.00 2296.50
1985 0.00 0.00 0.00 105.00 251.00 498.50 361.00 s 413.50 j 162.93 a 21.50 i 2.00 0.00 1019.43
1986 0.00 0.00 18.00 29.50 234.00 601.00 577.50 793.00 222.00 56.46 c 0.00 k 0.00 2531.46
1987 0.00 0.00 0.00 168.50 342.50 529.50 446.50 j 356.00 l 314.00 i 88.00 j 5.00 k 0.00 o 1040.50
1988 0.00 l 0.00 c 1.55 a 103.50 222.00 546.50 741.00 637.05 a 290.69 a 250.00 6.50 0.00 2798.79
1989 0.00 0.00 0.00 103.00 164.50 492.00 788.50 585.50 365.50 89.50 0.00 0.00 2588.50
1990 0.00 0.00 a 4.50 137.00 132.78 a 427.76 a 744.50 689.50 533.50 73.00 0.00 0.00 2742.54
1991 0.00 0.00 0.00 19.00 83.00 311.50 702.50 734.00 391.50 131.00 0.00 0.00 2372.50
1992 0.00 0.00 16.50 108.00 354.00 540.00 599.50 700.00 332.50 165.00 0.00 0.00 2815.50
1993 0.00 0.00 4.00 7.50 360.50 296.00 421.50 546.50 361.00 113.00 0.00 0.00 2110.00
1994 0.00 0.00 12.00 101.50 298.00 487.50 803.00 802.00 496.00 61.00 0.00 0.00 3061.00
1995 0.00 a 0.00 a 0.00 31.50 161.50 358.00 665.00 587.50 407.50 45.50 0.00 0.00 n 2256.50
1996 0.00 j 0.00 1.00 52.00 138.00 447.41 a 766.00 696.00 0.00 z 56.00 q 0.00 0.00 i 2100.41
1997 0.00 0.00 k 14.00 l 55.00 228.50 h 487.00 668.50 747.88 c 485.50 79.00 2.50 0.00 2525.38
1998 0.00 0.00 3.00 64.14 a 162.23 a 307.76 a 816.00 752.00 368.50 i 60.50 0.00 0.00 2165.63
1999 0.00 h 0.00 33.00 190.50 364.00 310.00 f 638.08 a 739.87 a 337.00 132.55 b 23.57 b 0.00 d 2458.57
2000 0.00 l 0.00 f 4.65 a 84.11 b 261.00 f 470.56 c 776.07 b 599.50 h 383.04 b 31.50 n 0.00 h 0.00 e 1718.42
2001 0.00 p 0.00 l 1.79 e 54.00 f 315.37 e 457.50 d 689.00 813.75 a 442.50 b 66.13 a 7.76 a 0.00 2793.80
2002 0.00 i 0.00 1.50 i 37.00 0.00 z 532.20 e 686.50 g 624.17 e 276.50 i 64.38 e 1.00 0.00 1258.76
2003 0.00 0.00 i 8.00 j 61.00 231.50 502.80 e 908.50 809.00 456.00 248.50 0.00 0.00 3217.30
2004 0.00 g 0.00 27.50 92.50 f 227.50 467.50 787.00 709.26 b 353.50 160.50 0.00 l 0.00 l 2732.76
2005 0.00 b 0.00 0.00 22.00 245.50 387.50 861.00 816.00 395.00 0.00 z 0.00 z 0.00 z 2727.00
2006 0.00 z 0.00 z 0.00 z 71.50 324.50 587.50 0.00 z 0.00 z 374.50 0.00 z 18.50 0.00 1376.50
2007 0.00 0.00 34.00 85.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 m 119.00
2008 0.00 0.00 0.00 31.50 251.50 411.00 809.00 777.00 420.00 0.00 z 0.00 z 0.00 z 2700.00
2009 0.00 z 0.00 0.50 52.50 285.00 426.00 784.00 725.00 573.00 63.50 0.00 z 0.00 z 2909.50
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 0.00 c 0.00 0.00 9.50 142.60 a 325.50 685.00 822.00 541.50 145.50 0.00 0.00 2671.60
2012 0.00 a 0.00 12.00 126.21 a 198.00 424.00 867.50 811.00 483.00 106.00 16.00 0.00 a 3043.71
2013 0.00 0.00 8.00 4.50 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 8.00
Period of Record Statistics
MEAN 0.00 0.00 4.57 64.28 226.71 429.88 727.24 695.16 384.64 101.04 2.56 0.02 2575.95
S.D. 0.00 0.00 8.47 45.97 81.98 90.93 84.99 80.82 123.73 52.49 4.94 0.16 249.92
SKEW 0.00 0.00 2.44 0.88 0.43 0.43 -0.35 -0.20 2.95 0.69 2.67 9.27 0.46
MAX 0.00 0.00 38.75 199.00 419.50 674.42 914.00 864.00 1193.04 250.00 23.57 1.50 3240.11
MIN 0.00 0.00 0.00 0.00 80.50 267.00 421.50 485.50 162.93 10.33 0.00 0.00 2110.00
NO YRS 90 94 94 95 95 95 90 93 90 86 86 89 64