SEATTLE UNIV OF WASH, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457478) SEATTLE UNIV OF WASHING
From Year=1909 To Year=1983
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 792 635 603 440 279 140 58 58 148 358 571 720 4801
60 637 494 448 293 145 43 8 8 50 209 421 565 3321
57 544 409 355 210 82 14 1 2 19 131 332 472 2570
55 482 353 294 159 49 5 0 1 9 88 273 410 2122
50 329 216 152 57 9 0 0 0 1 21 138 258 1181
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