DIABLO DAM, WASHINGTON

Monthly Total Heating Degree Days

(452157)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
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
1914 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 249.50 w 0.00
1915 1016.50 740.50 563.00 361.50 122.50 q 85.00 n 21.00 o 4.50 g 129.50 o 504.35 e 813.00 947.50 4946.35
1916 1431.50 886.50 797.00 524.00 405.50 171.00 99.50 57.00 214.00 531.50 870.00 1114.50 7102.00
1917 1053.50 933.00 814.50 611.50 357.50 234.50 59.00 11.00 213.50 430.00 584.50 921.00 6223.50
1918 953.00 915.50 820.50 451.50 385.00 90.52 a 58.00 94.00 67.00 455.91 b 437.50 m 624.00 l 4290.93
1919 1014.39 d 887.04 c 796.50 508.50 369.00 232.00 56.50 58.00 189.00 609.50 799.50 1094.82 a 6614.75
1920 716.00 j 247.50 t 444.00 m 480.50 f 430.50 223.50 27.00 59.00 278.50 565.00 769.00 913.50 3266.00
1921 999.50 819.00 762.50 623.00 330.00 149.50 98.50 63.55 a 334.50 478.00 813.50 1077.50 6549.05
1922 1155.00 990.00 847.00 610.50 377.50 69.50 35.50 45.00 197.50 454.00 857.00 1199.00 6837.50
1923 1042.00 950.00 822.00 512.00 349.00 190.50 30.50 21.50 156.00 477.50 745.00 968.50 6264.50
1924 1051.50 705.00 716.50 545.50 206.00 148.50 62.00 50.50 212.50 512.50 877.78 c 1084.50 6172.78
1925 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
1926 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
1927 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
1928 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 55.00 p 53.00 62.50 215.50 524.50 754.00 1012.50 2622.00
1929 1260.50 1007.00 749.50 604.00 334.00 190.00 70.00 63.50 195.50 444.00 816.00 994.00 6728.00
1930 1399.50 799.00 687.00 424.00 380.00 183.50 61.47 b 41.50 201.50 538.00 812.00 934.50 6461.97
1931 863.50 753.00 700.50 452.00 277.50 164.00 43.50 39.00 249.00 487.00 836.00 0.00 z 4865.00
1932 1070.69 e 922.00 743.00 503.50 358.50 0.00 z 51.50 m 118.00 0.00 z 0.00 z 0.00 z 0.00 z 3715.69
1933 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
1934 860.00 672.00 602.00 0.00 z 290.50 141.50 113.00 47.50 299.00 471.00 697.00 926.00 5119.50
1935 1125.00 727.00 862.00 585.50 315.50 185.00 114.00 104.00 180.50 559.50 881.00 876.50 6515.50
1936 973.00 1288.50 938.50 524.00 294.00 225.00 68.00 99.00 205.50 376.00 729.50 954.50 6675.50
1937 1400.00 990.00 725.50 659.00 336.50 169.00 68.50 104.50 171.00 390.00 746.00 910.50 6670.50
1938 1020.50 870.50 804.00 573.50 335.50 157.50 81.00 87.50 78.00 467.50 854.50 959.00 6289.00
1939 933.50 923.50 805.50 478.00 294.00 224.50 74.00 27.00 140.50 507.00 661.00 793.00 5861.50
1940 919.50 780.00 660.50 470.00 268.50 149.00 59.00 80.50 100.00 415.50 848.50 878.00 5629.00
1941 948.50 691.50 565.00 387.50 370.50 217.00 20.00 72.00 333.50 491.00 676.00 946.50 5719.00
1942 977.00 766.00 768.00 441.50 385.50 275.00 63.00 55.00 123.50 412.50 822.00 911.50 6000.50
1943 640.50 m 0.00 z 295.50 s 506.90 a 461.50 231.21 a 93.50 114.00 120.00 a 385.43 a 543.00 f 964.10 a 2876.64
1944 981.00 839.00 811.00 503.50 352.50 174.31 a 71.00 79.50 192.41 a 363.00 695.50 947.50 6010.22
1945 904.50 760.50 804.50 653.50 288.50 227.50 63.50 47.50 260.69 a 458.00 838.45 a 974.50 6281.64
1946 938.50 815.00 744.50 589.00 280.50 258.50 97.50 73.00 207.50 602.50 904.00 986.00 6496.50
1947 1069.00 763.00 671.50 478.00 265.00 231.50 98.00 97.81 b 200.50 0.00 z 768.00 892.00 5534.31
1948 968.00 940.50 807.00 631.50 418.00 139.50 126.50 112.00 235.50 518.50 806.00 1083.50 6786.50
1949 1237.50 959.50 755.50 516.00 283.50 232.00 149.50 99.00 183.00 606.05 a 614.48 a 985.50 6621.53
1950 1540.00 898.50 845.50 649.66 a 467.50 169.50 29.50 43.29 b 153.00 580.00 756.00 797.00 6929.45
1951 1039.50 854.50 935.00 454.50 344.62 a 110.50 57.50 63.00 129.50 525.50 775.00 1064.50 6353.62
1952 1158.00 847.00 782.50 506.00 274.00 234.00 80.50 80.00 124.00 292.00 729.50 909.00 6016.50
1953 796.00 715.50 733.50 531.50 299.00 240.50 38.00 105.50 184.50 414.00 654.50 662.50 g 4712.50
1954 130.00 z 758.00 817.00 685.50 351.00 288.50 128.50 149.00 206.00 523.00 590.00 892.00 5388.50
1955 957.00 881.00 982.50 665.00 520.28 a 222.00 179.50 64.00 225.00 507.00 953.00 1034.50 7190.78
1956 1014.00 960.00 878.50 483.50 246.50 266.00 54.00 66.00 177.00 594.00 766.50 947.50 6453.50
1957 1264.50 887.00 766.00 494.00 182.00 144.50 130.00 104.50 71.00 478.50 732.50 839.50 6094.00
1958 858.50 646.00 693.00 506.50 156.50 103.50 4.50 32.50 234.50 420.00 827.50 869.50 5352.50
1959 995.00 818.00 767.00 546.50 385.00 171.50 65.50 112.00 271.00 453.50 793.50 893.50 6272.00
1960 1016.50 809.00 775.50 554.50 395.50 188.50 38.00 142.00 184.50 417.50 772.00 888.00 6181.50
1961 835.50 729.50 336.50 s 556.80 e 340.00 98.50 56.00 18.00 251.50 574.00 841.50 957.50 5258.80
1962 994.50 748.50 816.00 466.11 c 444.50 186.50 123.50 108.00 168.00 446.00 672.00 852.00 6025.61
1963 1105.50 675.00 734.50 540.00 320.50 221.00 121.50 42.00 111.00 442.00 776.50 904.50 5994.00
1964 899.00 801.50 812.50 643.00 442.00 224.50 104.50 157.50 249.00 446.00 770.00 1091.50 6641.00
1965 963.00 795.00 748.50 511.50 396.00 168.50 0.00 z 84.50 215.50 406.00 644.50 948.00 5881.00
1966 996.00 0.00 z 759.00 518.50 318.00 214.00 98.00 66.00 129.00 511.50 709.00 842.00 5161.00
1967 898.00 750.50 806.00 593.50 361.00 96.00 58.00 22.45 b 77.50 488.00 682.00 961.00 5793.95
1968 997.00 712.50 697.00 609.50 329.50 217.00 58.50 110.50 187.50 562.50 718.00 1096.50 6296.00
1969 1310.00 854.00 718.00 563.00 255.00 87.00 101.00 104.00 236.00 489.50 666.00 866.50 6250.00
1970 983.50 662.50 707.00 653.50 344.50 117.00 71.00 51.50 301.00 523.50 762.50 1006.00 6183.50
1971 1042.50 795.00 870.00 605.50 324.00 302.00 121.00 18.00 291.50 550.00 760.00 1072.50 6752.00
1972 1103.50 860.50 753.00 658.00 329.50 226.00 83.00 47.50 338.50 499.00 732.50 1090.50 6721.50
1973 1067.00 745.00 706.50 545.50 323.00 222.50 98.50 114.00 171.00 537.50 853.00 833.50 6217.00
1974 1031.50 773.00 795.00 557.50 483.00 155.50 111.00 46.50 90.50 425.00 724.50 855.00 6048.00
1975 983.00 945.30 e 858.50 685.50 438.00 303.00 38.50 f 166.92 e 119.50 516.00 823.50 919.00 6758.23
1976 917.00 825.50 862.00 558.50 357.00 273.50 123.50 137.00 124.00 442.00 662.50 827.00 6109.50
1977 991.00 668.00 781.50 456.00 405.50 134.50 141.64 b 71.00 239.00 512.00 536.00 m 965.50 5365.64
1978 968.00 760.50 655.00 532.50 b 384.50 122.00 65.50 94.00 281.50 426.50 880.50 1048.00 6218.50
1979 1181.50 871.00 679.50 558.00 308.50 173.00 74.00 35.00 127.00 388.50 779.00 841.50 6016.50
1980 1129.50 781.50 783.00 419.48 a 316.00 218.50 72.00 113.00 207.00 428.00 711.00 886.00 6064.98
1981 796.50 752.00 623.00 581.50 338.50 281.00 111.00 43.50 205.00 517.00 682.00 922.50 5853.50
1982 1027.50 859.00 755.00 642.50 392.00 134.50 149.00 111.00 177.00 506.00 880.50 924.00 6558.00
1983 844.50 709.50 639.50 490.00 270.50 207.50 153.00 50.50 279.50 517.50 701.50 1174.00 6037.50
1984 890.00 774.50 650.00 581.50 490.00 248.00 93.00 69.50 293.00 583.00 819.50 0.00 z 5492.00
1985 0.00 z 908.50 0.00 z 572.00 350.00 193.00 13.50 85.00 289.50 581.00 1108.50 1058.50 5159.50
1986 846.50 841.50 649.00 589.50 377.00 110.00 134.50 9.00 241.00 402.50 784.00 939.00 5923.50
1987 966.50 720.00 681.00 428.00 293.00 145.50 0.00 z 63.50 133.50 364.50 638.50 972.00 5406.00
1988 1003.00 776.50 734.00 498.00 353.00 183.00 97.50 75.50 235.50 362.50 752.00 910.50 5981.00
1989 946.00 1010.00 820.00 460.50 376.00 124.00 94.50 81.00 103.00 480.00 716.50 837.00 6048.50
1990 899.00 909.50 709.00 446.00 363.50 208.00 40.00 45.00 77.00 592.50 702.00 1169.50 6161.00
1991 1067.50 693.00 798.50 543.50 386.00 246.00 58.50 74.50 115.00 465.00 717.00 845.00 6009.50
1992 879.00 677.50 483.00 432.50 228.00 100.50 70.00 55.00 293.00 453.00 746.00 1030.75 a 5448.25
1993 1233.00 869.50 690.00 565.00 206.50 205.50 160.00 86.00 164.50 390.50 865.50 916.50 6352.50
1994 766.50 870.00 670.00 430.00 251.00 204.50 46.00 37.00 103.00 502.00 894.00 993.00 5767.00
1995 966.50 746.50 729.00 517.50 210.50 151.50 54.50 161.00 79.00 553.50 696.00 935.50 5801.00
1996 1032.00 869.00 749.00 520.50 481.00 189.50 78.50 72.50 257.50 540.50 842.50 1115.50 6748.00
1997 1004.00 792.50 0.00 z 589.00 308.00 229.50 108.00 37.50 0.00 z 528.00 673.50 912.50 5182.50
1998 993.00 713.50 695.50 482.00 294.50 124.50 32.00 36.50 88.50 460.50 713.50 989.00 5623.00
1999 889.50 806.00 787.50 578.50 469.00 284.50 108.50 60.00 197.50 500.00 696.50 882.50 6260.00
2000 973.00 800.00 741.00 477.00 403.00 192.50 97.50 94.00 225.50 484.00 822.00 969.50 6279.00
2001 885.50 820.50 704.00 569.50 359.60 a 235.50 66.50 63.00 164.00 556.00 699.50 964.00 6087.60
2002 934.50 820.00 917.50 582.50 438.00 158.50 74.50 58.50 193.00 484.50 671.00 875.00 6207.50
2003 845.50 737.50 768.50 546.00 365.50 126.50 43.50 22.00 149.50 395.50 858.50 929.00 5787.50
2004 1022.00 747.00 668.00 398.50 294.50 127.00 38.00 53.00 247.00 452.00 721.00 863.50 5631.50
2005 988.50 736.50 661.50 462.00 228.00 213.00 58.50 34.50 215.50 455.50 788.00 940.50 5782.00
2006 847.00 833.50 754.00 519.00 340.00 143.00 51.50 54.50 145.00 466.00 828.00 942.50 5924.00
2007 992.00 759.00 743.50 580.00 319.00 228.50 40.50 80.00 200.00 554.50 769.00 938.50 6204.50
2008 1057.00 823.50 814.00 679.50 353.50 278.00 67.50 101.00 194.50 524.00 674.50 1077.00 6644.00
2009 992.50 831.50 912.50 578.00 0.00 z 0.00 z 0.00 z 67.00 145.00 534.50 752.50 1069.00 5882.50
2010 847.50 686.00 674.50 556.00 410.00 216.50 79.50 73.00 193.50 438.00 831.00 964.50 5970.00
2011 966.50 892.00 799.50 707.00 453.50 231.50 145.00 47.00 130.50 511.50 855.52 a 951.50 6691.02
2012 991.00 811.50 840.00 524.50 356.00 289.50 79.50 37.50 119.50 466.50 724.00 925.00 6164.50
2013 1011.50 771.50 723.50 22.50 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 38.50 z 2506.50
Period of Record Statistics
MEAN 1011.18 816.39 755.60 540.28 345.06 191.06 80.07 71.95 189.95 483.43 767.02 957.15 6227.84
S.D. 141.55 100.57 85.61 74.97 72.26 55.52 36.36 34.65 66.61 64.67 85.25 88.44 381.73
SKEW 1.38 1.24 -0.16 0.04 -0.06 -0.07 0.45 0.59 0.13 -0.22 0.61 0.61 0.22
MAX 1540.00 1288.50 982.50 707.00 520.28 303.00 179.50 166.92 338.50 609.50 1108.50 1199.00 7190.78
MIN 766.50 646.00 483.00 361.50 156.50 69.50 4.50 9.00 67.00 292.00 584.50 793.00 5352.50
NO YRS 90 91 89 91 91 90 88 93 91 92 90 89 73