SKAGIT POWER PLANT, WASHINGTON

Monthly Total Heating Degree Days

(457690)

Base Temperature = 65 F

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 195812
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
1931 772.00 674.00 659.50 397.50 189.50 138.50 30.00 32.50 273.00 404.00 764.50 905.00 5240.00
1932 1006.50 900.50 721.50 413.00 271.50 55.50 81.00 41.50 132.50 413.50 680.50 1007.50 5725.00
1933 962.50 945.50 746.00 483.00 386.50 162.00 40.50 23.00 233.79 a 389.50 549.50 877.50 5799.29
1934 823.57 a 522.00 416.50 199.50 191.00 94.00 56.00 15.50 217.50 401.45 a 620.00 784.00 4341.02
1935 1024.00 664.00 815.00 503.50 280.00 146.50 98.50 66.00 118.00 459.00 788.50 755.00 5718.00
1936 893.00 1128.50 842.00 466.50 217.50 122.50 48.05 a 34.50 170.50 395.00 670.00 931.50 5919.55
1937 1270.00 947.50 699.00 607.00 327.50 145.00 37.50 110.50 139.00 347.00 711.50 883.50 6225.00
1938 946.69 e 742.00 685.50 415.00 227.50 106.50 40.00 64.00 52.50 d 333.50 752.50 891.00 5256.69
1939 838.00 842.00 691.00 408.50 281.00 226.50 76.00 37.09 c 148.00 422.00 595.50 743.00 5308.59
1940 806.50 708.00 571.50 381.50 216.50 91.50 35.00 54.50 76.50 371.50 758.50 796.00 4867.50
1941 785.00 557.00 423.00 350.50 283.00 124.50 10.50 53.00 250.00 392.50 627.00 881.50 4737.50
1942 830.50 677.50 674.00 372.00 306.00 185.50 26.00 30.00 109.50 406.00 758.50 889.00 5264.50
1943 1147.50 678.50 787.00 386.00 369.50 174.00 58.00 97.50 97.00 405.00 603.00 880.50 5683.50
1944 905.00 763.00 756.50 439.00 293.50 145.50 59.50 65.00 146.00 254.50 653.50 830.50 5311.50
1945 824.50 713.00 763.50 597.50 240.00 200.00 59.50 40.00 226.00 400.00 822.00 909.00 5795.00
1946 907.50 795.00 708.00 518.50 196.50 202.00 49.50 45.50 159.50 540.00 840.00 962.00 5924.00
1947 1030.50 670.00 581.50 394.14 a 194.00 176.50 62.00 59.50 151.00 434.00 709.50 858.50 5321.14
1948 902.00 891.50 738.00 574.50 338.50 97.24 a 104.76 b 90.93 a 198.00 467.00 771.50 1020.00 6193.93
1949 1189.37 a 909.39 e 703.00 475.00 229.50 174.50 94.00 78.50 141.00 519.00 469.00 978.00 5960.26
1950 1450.50 856.50 807.50 584.00 396.50 144.00 61.50 49.50 131.00 509.00 722.50 720.50 6433.00
1951 987.50 787.00 873.50 394.00 293.50 112.24 a 49.50 60.45 a 113.50 448.00 673.00 976.50 5768.69
1952 1097.00 801.50 760.00 461.90 a 246.50 154.50 f 75.00 79.00 116.00 228.50 651.00 638.00 h 4516.40
1953 823.00 697.50 689.48 b 515.00 273.50 256.00 92.00 68.00 181.50 410.00 627.50 828.50 5461.98
1954 1127.48 d 740.50 764.00 657.50 295.02 a 279.50 124.50 148.80 a 182.50 454.00 531.50 813.50 6118.80
1955 872.50 836.50 929.50 464.50 h 0.00 z 66.00 w 168.00 94.50 206.50 477.50 905.00 978.50 5468.50
1956 952.00 936.00 853.00 426.50 225.50 245.00 62.00 a 83.00 169.00 554.90 a 689.00 884.00 6079.90
1957 1151.50 843.50 719.00 459.00 175.00 84.00 k 111.71 b 106.50 59.00 442.00 667.00 810.00 5544.21
1958 784.50 587.00 636.50 475.00 145.00 87.50 5.50 31.50 238.45 a 381.00 767.50 804.50 4943.95
Period of Record Statistics
MEAN 968.24 779.10 714.80 457.59 262.57 155.70 64.86 62.87 158.46 416.41 692.11 874.04 5575.93
S.D. 166.37 135.19 116.48 95.58 65.18 56.89 35.59 30.69 57.34 73.09 97.42 81.17 513.26
SKEW 1.06 0.31 -0.87 -0.12 0.34 0.44 0.84 0.79 0.11 -0.48 -0.11 0.00 -0.51
MAX 1450.50 1128.50 929.50 657.50 396.50 279.50 168.00 148.80 273.00 554.90 905.00 1020.00 6433.00
MIN 772.00 522.00 416.50 199.50 145.00 55.50 5.50 15.50 52.50 228.50 469.00 720.50 4341.02
NO YRS 28 28 28 27 27 25 28 28 28 28 28 27 25