WHITE SWAN, WASHINGTON

Monthly Total Heating Degree Days

(459191)

Base Temperature = 65 F

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 198107
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
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 32.00 52.59 c 53.98 b 211.07 b 504.55 b 469.00 m 942.50 h 854.20
1949 1581.50 912.43 e 702.09 d 370.50 201.50 c 130.86 a 38.75 a 40.41 c 40.50 q 360.50 l 634.50 415.00 r 4612.55
1950 1597.05 c 994.50 729.00 530.00 307.42 a 91.00 12.92 a 5.50 103.50 480.00 775.50 890.39 d 6516.78
1951 1029.00 760.00 556.00 h 388.00 249.00 84.00 33.50 36.96 e 5.00 u 0.00 z 0.00 z 722.50 m 2580.46
1952 1294.50 832.00 677.00 359.50 168.00 81.72 a 20.67 a 19.00 62.59 a 126.00 j 442.00 m 518.50 o 3514.98
1953 711.00 660.00 637.50 481.50 300.50 151.00 8.27 a 25.00 125.69 a 345.00 640.80 e 0.00 z 4086.26
1954 1107.22 a 807.00 756.73 c 464.48 a 197.00 141.21 a 22.50 35.50 130.00 479.50 436.50 h 301.00 u 4141.14
1955 1079.00 803.19 a 822.50 587.00 336.50 96.50 74.50 35.00 0.00 z 189.00 r 980.00 1173.35 a 5987.54
1956 1112.50 1164.50 709.38 a 368.50 166.00 122.07 a 2.07 a 33.58 a 115.18 b 490.32 a 906.72 a 168.00 z 5190.82
1957 1551.15 d 845.50 380.00 n 376.03 a 114.00 73.50 35.43 c 56.26 d 76.11 c 473.50 f 258.00 u 858.18 a 3986.16
1958 882.47 a 580.00 701.63 a 467.59 a 94.50 0.00 z 0.00 q 12.18 c 167.14 b 412.50 648.50 h 771.00 f 3318.01
1959 1026.50 801.63 a 631.76 b 407.22 c 354.84 c 83.57 b 43.83 b 65.50 212.50 352.00 f 898.89 c 1037.98 a 5564.22
1960 1313.50 807.70 b 722.30 a 455.17 a 313.10 a 68.79 a 4.50 68.00 128.28 a 408.34 b 757.50 567.00 o 5047.19
1961 914.50 c 640.00 627.00 454.00 212.57 c 50.89 b 6.72 a 3.50 213.62 a 520.91 c 590.50 j 999.50 4643.21
1962 1053.00 806.00 759.50 b 346.50 343.07 a 115.71 b 50.63 a 25.12 b 94.66 a 468.21 b 0.00 z 850.90 b 4913.29
1963 1207.40 b 790.00 641.24 d 501.72 a 249.07 b 100.18 b 37.31 d 28.42 a 58.39 b 395.77 a 708.00 302.00 w 4717.50
1964 916.29 e 774.00 715.14 b 510.00 a 293.47 a 118.89 c 34.74 b 63.60 b 206.50 463.89 c 181.50 v 1276.96 e 5373.48
1965 0.00 z 0.00 z 278.50 t 358.27 d 302.00 68.57 b 29.45 a 32.03 a 221.00 0.00 z 0.00 z 0.00 z 1011.32
1966 0.00 z 0.00 z 0.00 z 0.00 z 241.69 d 159.44 c 50.12 a 33.58 a 87.86 b 451.16 c 699.11 b 864.38 a 2587.34
1967 611.00 g 661.00 678.79 b 591.50 269.00 58.97 a 14.00 3.21 b 42.50 392.84 b 735.00 b 1021.40 b 4468.21
1968 1004.40 a 725.00 575.50 507.00 e 243.00 92.50 29.50 70.50 108.00 550.50 736.50 1100.50 5742.90
1969 1396.60 b 963.00 662.88 a 450.00 a 182.38 a 53.79 a 0.50 n 51.50 136.00 497.50 727.00 971.69 b 6092.35
1970 1080.00 643.00 606.00 474.50 226.09 b 53.57 b 20.00 10.00 225.00 491.72 b 708.21 b 1074.50 5612.60
1971 860.50 707.50 767.50 455.77 d 83.50 m 182.00 60.00 9.50 h 280.00 520.00 788.33 c 1056.50 5678.10
1972 1040.00 913.00 632.00 570.50 214.00 68.00 23.25 c 24.91 c 255.00 491.72 b 753.60 e 1217.86 c 6203.84
1973 1108.25 a 784.00 a 603.00 418.50 226.50 118.45 a 27.50 65.74 b 169.66 a 485.50 838.00 872.50 5717.59
1974 1176.00 702.50 657.50 412.00 307.50 78.50 42.00 15.50 75.00 418.50 678.00 874.20 a 5437.20
1975 1008.00 889.50 738.00 528.00 235.50 80.00 5.00 45.47 a 100.00 452.00 756.00 966.00 5803.47
1976 961.00 811.00 748.00 482.50 236.00 168.10 a 27.00 i 44.50 h 51.00 440.00 732.00 1057.50 5687.10
1977 1292.50 722.50 634.50 311.11 c 325.00 32.00 22.06 e 14.50 x 202.00 434.50 787.50 909.00 5672.67
1978 979.00 741.46 b 529.50 404.50 256.00 49.50 8.50 40.00 127.80 e 406.50 910.80 e 0.00 z 4453.56
1979 1513.50 392.50 o 570.50 397.50 153.50 57.00 25.46 c 5.00 41.00 301.50 880.50 883.00 4828.46
1980 1327.50 962.00 664.00 196.50 l 184.45 a 94.44 c 23.00 44.71 e 129.50 284.00 l 334.50 q 435.50 r 3429.61
1981 420.50 p 0.00 z 363.00 j 246.00 o 0.00 z 80.50 g 37.95 b 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 37.95
Period of Record Statistics
MEAN 1142.20 800.13 675.02 447.65 242.04 92.40 28.93 34.99 138.55 452.12 774.20 997.81 5862.05
S.D. 229.31 124.44 68.19 73.43 66.60 39.08 17.59 20.59 67.06 57.54 92.28 127.10 371.20
SKEW 0.51 0.77 -0.02 0.22 -0.24 0.58 0.50 0.11 0.37 -0.72 0.60 0.64 0.79
MAX 1597.05 1164.50 822.50 591.50 354.84 182.00 74.50 70.50 280.00 550.50 980.00 1276.96 6516.78
MIN 711.00 580.00 529.50 311.11 94.50 32.00 2.07 3.21 41.00 301.50 634.50 850.90 5437.20
NO YRS 29 29 28 30 31 32 31 30 30 25 22 20 7