SEATTLE SAND PT WSFO, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457470) SEATTLE SAND PT WSFO
From Year=1986 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 705 602 564 410 263 129 38 26 107 343 551 721 4461
60 550 461 409 262 129 32 3 1 26 193 401 566 3032
57 457 376 316 178 67 8 0 0 7 116 311 473 2309
55 395 319 255 127 37 3 0 0 2 75 252 411 1876
50 243 181 115 33 4 0 0 0 0 17 120 258 972
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 Jul 28, 2006
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