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=2012
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 712 606 575 427 277 136 38 27 108 351 556 730 4546
60 557 465 420 279 140 36 2 1 26 200 406 575 3109
57 464 380 328 194 75 10 0 0 7 121 317 482 2378
55 403 323 266 141 43 3 0 0 2 79 258 420 1938
50 250 185 125 41 4 0 0 0 0 18 125 267 1016
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