ARROWROCK DAM, IDAHO

Monthly Total Heating Degree Days

(100448)

Base Temperature = 65 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 544.00 l 1119.50 1119.50
1912 1196.00 909.50 768.00 479.50 235.50 38.50 27.00 20.50 256.50 503.00 722.50 1145.00 6301.50
1913 1266.00 1099.50 857.00 404.50 186.00 53.00 14.00 0.00 111.50 481.00 679.50 1168.00 6320.00
1914 942.00 871.50 590.50 370.00 125.55 a 123.00 0.00 2.00 138.00 308.00 705.00 1300.50 5476.05
1915 1220.00 716.00 552.00 274.00 331.00 153.00 18.48 e 0.00 0.00 z 0.00 z 784.00 1040.64 b 5089.12
1916 1265.50 896.50 686.00 358.00 0.00 z 45.50 r 34.10 a 53.45 b 14.50 z 543.05 c 956.79 b 1254.95 c 6048.33
1917 215.50 y 1101.00 1110.00 651.72 a 378.41 b 161.50 0.60 e 0.00 m 71.11 c 283.00 g 410.50 k 852.00 4326.35
1918 1008.03 b 955.23 b 691.82 a 559.04 d 343.14 b 32.31 d 1.50 j 53.98 b 62.88 d 409.50 644.00 f 1168.38 b 5284.31
1919 1148.03 a 911.50 831.32 a 455.00 c 240.25 c 96.92 d 0.00 c 0.00 111.00 e 640.09 d 925.50 1389.12 b 6748.74
1920 1228.00 908.13 b 666.50 g 493.00 f 346.37 e 68.08 d 0.50 g 33.67 b 135.00 516.15 a 805.18 b 1076.00 5116.57
1921 1100.00 941.00 713.55 c 416.00 j 290.00 63.21 b 28.33 b 0.00 d 183.00 h 254.50 l 743.57 b 1082.00 4961.67
1922 1420.66 b 1065.00 992.50 661.07 b 324.97 b 14.50 3.58 e 3.00 84.64 b 345.50 896.54 d 1187.76 d 6999.71
1923 1141.66 b 1201.00 904.88 b 509.46 b 288.50 163.00 1.50 0.00 d 91.73 d 490.66 b 782.68 b 1158.50 6733.56
1924 1410.00 765.81 b 841.98 c 398.00 g 103.50 66.96 b 2.50 g 13.71 e 140.77 d 429.02 c 838.33 c 1174.00 g 4610.09
1925 1187.00 871.92 c 740.26 b 448.50 172.64 b 160.18 b 0.00 c 39.02 b 136.07 b 534.46 d 848.04 b 1003.76 b 6141.84
1926 1182.50 797.50 663.29 b 341.00 241.80 a 37.24 a 0.00 d 18.17 b 268.85 d 315.50 g 646.00 1173.00 5369.35
1927 0.00 z 736.50 f 807.55 a 544.29 b 378.50 58.00 f 2.67 b 21.50 195.00 373.79 e 531.00 h 1051.00 f 2323.30
1928 1246.00 1032.19 b 771.12 c 603.00 138.00 127.50 d 6.50 0.57 d 95.56 c 318.50 k 532.00 j 913.50 j 4020.44
1929 1520.07 b 997.50 f 822.57 b 599.00 282.00 110.36 b 0.57 d 0.00 d 173.00 f 218.50 l 917.88 d 947.16 c 5199.61
1930 1585.00 787.00 715.67 b 351.67 c 354.43 a 121.07 b 0.00 f 3.74 b 77.00 j 501.96 e 796.00 h 1477.84 b 5898.39
1931 1298.90 a 988.62 b 530.00 j 486.67 c 188.50 20.19 d 0.00 0.00 b 141.96 b 448.43 b 688.50 j 1093.50 f 3573.27
1932 1375.76 b 1195.00 875.50 482.14 b 275.90 a 125.89 b 18.08 a 28.33 b 88.93 b 477.50 765.54 b 1374.00 7082.57
1933 1318.50 1369.41 a 973.00 549.00 416.00 28.50 0.00 18.08 a 179.44 c 337.56 d 775.00 949.12 a 6913.61
1934 923.50 677.38 b 527.52 a 293.00 126.50 82.50 0.00 a 0.00 c 186.96 b 436.21 c 689.44 c 1187.09 b 5130.11
1935 1242.00 990.50 904.00 542.50 343.07 a 80.36 b 24.00 14.50 56.79 b 463.34 c 1025.19 d 1198.00 6884.24
1936 1290.00 1219.04 a 995.62 a 468.00 208.73 a 84.00 i 2.30 d 6.00 153.21 b 410.00 928.97 a 1113.33 b 6795.19
1937 1709.28 b 1152.67 a 802.00 617.07 a 217.52 a 114.83 a 0.00 w 25.32 a 103.97 a 422.93 c 727.50 1028.00 6921.07
1938 1149.21 c 817.19 a 862.66 b 479.00 330.84 b 71.25 b 21.46 e 18.00 49.82 b 439.88 b 1007.00 1094.00 6340.31
1939 1180.00 1193.77 b 634.00 j 438.50 173.50 175.38 d 3.74 b 0.00 123.50 501.50 787.50 916.00 5493.40
1940 1055.00 887.00 690.50 499.50 156.50 51.00 1.50 0.00 160.50 381.00 959.50 1022.00 5864.00
1941 1102.50 812.00 634.00 458.00 219.00 92.00 0.00 8.02 b 228.00 501.00 767.00 1022.50 5844.02
1942 1409.50 1034.00 862.50 494.50 430.00 155.50 1.50 27.00 109.00 450.00 852.00 1152.50 6978.00
1943 1268.00 1004.50 946.50 402.50 386.50 169.50 12.00 19.00 37.00 428.00 823.00 1055.50 6552.00
1944 1279.00 967.00 911.00 575.50 261.00 184.50 9.50 3.50 158.50 327.00 844.50 1136.00 6657.00
1945 1111.00 869.50 864.00 626.00 291.00 188.00 3.00 17.50 241.00 369.00 880.00 1212.50 6672.50
1946 1363.50 1118.50 804.00 440.50 290.50 76.50 2.50 2.00 187.50 641.00 849.00 951.50 6727.00
1947 1373.50 853.50 683.00 491.50 165.00 145.00 0.00 21.50 152.50 382.00 931.00 1096.00 6294.50
1948 1161.50 1021.00 945.00 575.50 330.00 56.00 18.50 21.50 133.45 a 425.73 a 908.00 1415.00 7011.18
1949 1945.50 1143.33 a 831.50 385.86 a 221.50 111.50 5.50 0.00 93.50 629.00 688.00 1149.50 7204.70
1950 1319.00 1009.00 886.00 548.50 377.00 154.50 12.50 19.00 147.00 353.00 759.50 928.50 6513.50
1951 1271.50 934.50 970.50 453.00 288.00 141.50 3.21 b 29.50 115.00 541.50 885.50 1220.00 6853.71
1952 1306.98 c 1187.00 975.50 426.00 258.50 103.00 18.50 6.00 71.50 306.50 962.00 1057.50 6678.98
1953 885.57 a 847.50 765.00 592.50 435.00 195.50 2.58 a 15.00 84.83 a 395.50 665.00 1115.50 5999.48
1954 1046.00 816.00 864.00 493.85 d 229.00 219.50 14.97 b 41.50 155.00 508.00 692.00 1157.00 6236.81
1955 1388.50 1154.00 1034.50 687.50 371.00 89.50 138.00 0.00 210.00 441.50 993.50 1056.50 7564.50
1956 1069.50 1224.50 845.50 492.93 a 265.50 111.50 13.00 41.50 116.50 516.50 926.90 a 1122.00 6745.83
1957 1451.00 1004.50 840.00 539.00 247.50 91.00 3.00 3.50 74.00 520.00 959.00 1037.00 6769.50
1958 1239.00 790.50 850.00 595.00 155.50 83.00 2.00 4.00 144.00 313.00 816.00 881.00 5873.00
1959 971.50 835.00 747.50 406.50 387.00 47.00 4.00 14.00 218.50 453.00 817.50 1068.00 5969.50
1960 1194.00 1017.00 776.50 449.00 321.00 26.00 0.00 58.00 51.21 a 450.50 793.50 1100.00 6236.71
1961 1064.00 764.50 725.00 526.00 235.08 a 8.50 0.00 0.00 222.50 506.00 890.50 1122.00 6064.08
1962 1358.00 954.50 869.00 381.50 312.00 95.50 5.00 28.00 70.00 422.50 725.00 929.00 6150.00
1963 1229.50 676.00 716.50 568.00 206.50 146.50 2.50 1.50 48.00 297.00 755.50 1126.50 5774.00
1964 1231.00 1144.50 1028.50 615.00 354.00 146.00 2.00 65.50 207.50 408.00 850.00 1037.50 7089.50
1965 1057.50 889.00 881.00 487.00 357.00 117.50 11.50 51.09 d 274.50 306.50 657.00 1040.50 6130.09
1966 1043.50 916.50 773.00 517.00 203.00 130.00 9.50 20.00 61.50 527.00 721.50 1060.00 5982.50
1967 1010.50 822.00 788.50 697.50 324.50 126.50 0.00 0.50 66.50 533.00 750.00 1198.00 6317.50
1968 1171.50 831.00 683.50 639.00 328.50 106.00 4.50 107.00 199.00 507.50 829.00 1089.50 6496.00
1969 1092.00 955.00 850.50 494.00 197.00 102.00 16.50 9.00 132.50 653.50 817.50 1069.00 6388.50
1970 1089.50 792.50 821.50 717.50 331.00 124.50 16.50 1.50 325.00 617.00 784.50 1169.50 6790.50
1971 1190.50 936.50 970.00 578.50 283.50 151.50 25.00 3.50 273.00 568.00 866.50 1159.00 7005.50
1972 1200.50 1027.00 763.00 615.50 275.00 73.50 21.00 0.50 268.00 480.50 840.00 1246.00 6810.50
1973 1138.00 803.50 741.50 562.00 252.00 129.50 6.50 11.00 182.00 479.00 865.00 979.50 6149.50
1974 1305.00 975.00 856.00 596.50 386.00 75.00 29.00 22.50 89.00 430.00 806.00 1118.50 6688.50
1975 1245.50 993.00 900.00 750.50 424.00 151.00 5.50 58.50 116.00 521.00 884.00 1115.50 7164.50
1976 1219.50 1078.50 1046.50 626.50 243.00 178.00 6.00 0.00 z 146.00 510.50 793.50 1143.00 6991.00
1977 1361.50 923.00 910.50 428.00 466.00 18.00 22.00 52.50 206.00 490.50 889.50 999.00 6766.50
1978 1004.50 875.50 646.00 577.00 395.00 124.00 11.00 62.50 233.50 411.00 891.00 1251.50 6482.50
1979 1501.00 964.50 804.50 609.00 291.00 105.00 7.00 3.00 41.00 328.50 917.50 987.00 6559.00
1980 1137.18 a 803.00 787.00 430.00 308.00 159.00 1.00 44.50 142.00 440.50 819.50 1052.00 6123.68
1981 995.00 835.00 705.50 502.00 340.00 141.00 19.50 3.00 130.00 557.00 703.50 990.00 5921.50
1982 1284.50 1120.00 827.50 666.00 370.50 106.00 41.00 1.00 176.00 506.50 903.50 1074.50 7077.00
1983 986.50 773.00 679.00 590.50 345.00 112.00 57.50 1.03 a 153.50 419.00 735.50 1229.50 6082.03
1984 1301.50 1083.50 788.00 596.50 373.50 199.00 2.50 1.50 235.00 550.00 849.83 a 1369.00 7349.83
1985 1427.50 1156.00 961.00 446.00 243.50 49.00 0.00 s 8.00 j 294.31 a 424.50 i 1089.00 1471.00 7137.31
1986 1103.00 819.00 612.00 555.50 342.00 28.00 37.50 2.00 290.50 453.93 c 508.50 k 1139.50 5382.93
1987 1231.50 836.00 750.50 353.50 162.00 65.00 10.50 j 14.00 l 66.50 i 250.00 j 465.50 k 510.50 o 3398.50
1988 819.50 l 900.67 c 769.83 a 419.00 270.50 76.50 5.50 0.00 a 200.17 a 223.00 827.00 1244.50 4936.68
1989 1348.50 1245.00 804.00 423.50 327.00 43.50 0.00 37.00 109.00 485.50 820.00 1090.00 6733.00
1990 1027.50 1003.85 a 728.00 362.00 367.35 a 127.76 a 9.50 13.50 27.00 499.50 823.00 1423.00 6411.96
1991 1283.00 756.50 787.00 600.00 412.00 144.50 2.00 0.00 106.00 474.00 892.00 1072.00 6529.00
1992 1038.00 742.00 556.00 401.00 143.50 59.50 20.00 41.50 155.00 352.50 954.50 1219.50 5683.00
1993 1334.00 1057.00 814.50 580.50 180.00 203.00 77.00 53.50 139.00 409.50 931.50 1022.50 6802.00
1994 993.00 933.00 647.00 424.50 198.00 103.50 13.50 1.00 35.00 502.50 1025.50 1128.50 6005.00
1995 1033.33 a 711.41 a 775.00 540.00 326.50 147.00 17.00 33.50 104.50 500.50 708.00 509.50 n 4896.74
1996 711.50 j 1012.50 693.00 489.00 350.50 71.38 a 1.50 16.50 0.00 z 246.50 q 721.00 743.00 i 3355.38
1997 1096.00 515.00 k 414.00 l 516.50 139.00 h 37.00 29.00 0.00 c 75.50 485.00 752.50 1095.00 4086.50
1998 934.50 762.50 728.50 525.52 a 339.97 a 151.55 a 0.00 0.00 43.50 i 503.50 743.50 1092.00 5781.54
1999 760.00 h 892.50 643.50 292.00 180.50 121.00 f 25.83 a 6.20 a 150.50 385.90 b 624.64 b 1093.61 d 4295.18
2000 685.50 l 636.50 f 701.63 a 397.50 b 129.00 f 70.56 c 4.81 b 0.00 h 141.43 b 273.50 n 710.50 h 1149.38 e 2465.31
2001 584.00 p 527.50 l 694.52 e 443.00 f 186.60 e 87.12 d 18.50 2.58 a 89.46 b 527.00 a 735.00 a 1316.50 3657.28
2002 847.50 i 981.50 648.50 i 482.00 0.00 z 84.00 e 0.00 g 8.94 e 80.50 i 483.48 e 767.00 894.50 3701.42
2003 882.50 537.00 i 451.50 j 484.50 323.50 43.20 e 0.00 0.00 91.00 296.50 881.50 943.50 3946.20
2004 964.50 g 945.00 586.50 286.50 f 257.50 81.00 1.50 20.84 b 145.00 398.00 527.00 l 669.00 l 2435.34
2005 1154.48 b 895.00 687.00 570.50 232.50 131.00 0.00 1.00 109.00 0.00 z 0.00 z 0.00 z 3780.48
2006 0.00 z 0.00 z 0.00 z 443.50 202.50 15.00 0.00 z 0.00 z 163.00 0.00 z 732.00 1106.00 2662.00
2007 1179.00 785.50 571.50 447.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 657.50 m 2983.50
2008 1296.00 1052.50 896.00 668.50 256.50 149.50 0.00 2.50 73.00 0.00 z 0.00 z 0.00 z 4394.50
2009 0.00 z 884.00 837.00 520.00 265.50 78.50 4.50 24.00 51.50 514.50 0.00 z 0.00 z 3179.50
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 1103.82 c 905.50 777.50 639.50 368.90 a 163.00 4.50 0.00 25.50 395.00 821.00 1046.00 6250.22
2012 1030.75 a 922.50 717.50 423.10 a 297.00 108.00 0.00 0.00 26.00 450.50 678.00 945.50 a 5598.85
2013 1310.00 854.00 701.50 10.50 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 2865.50
Period of Record Statistics
MEAN 1208.77 946.31 795.00 509.21 283.81 104.47 11.86 16.55 138.57 455.31 823.28 1116.94 6463.98
S.D. 177.79 144.76 120.47 100.53 82.51 49.95 18.89 20.50 69.89 85.44 98.55 129.74 487.09
SKEW 0.94 0.46 0.13 -0.02 -0.11 0.04 4.04 1.62 0.55 -0.13 0.24 0.65 -0.24
MAX 1945.50 1369.41 1110.00 750.50 466.00 219.50 138.00 107.00 325.00 653.50 1089.00 1477.84 7564.50
MIN 882.50 676.00 527.52 274.00 103.50 8.50 0.00 0.00 25.50 223.00 624.64 852.00 5130.11
NO YRS 90 94 94 95 95 95 90 93 90 86 86 89 64