WHITE SWAN, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(459191) WHITE SWAN
From Year=1927 To Year=1981
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 1136 817 659 430 235 94 24 31 137 435 773 982 5754
60 981 676 504 286 121 29 4 5 56 289 624 827 4401
57 888 591 412 206 71 10 1 1 28 209 534 734 3684
55 826 535 352 158 45 4 0 0 17 161 474 672 3243
50 671 394 210 62 9 0 0 0 3 69 328 519 2267
Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. This is done for each day of the month and summed.
Table updated on Oct 31, 2012
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Western Regional Climate Center, wrcc@dri.edu