SEATTLE MAPLE LEAF R, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457463) SEATTLE MAPLE LEAF R
From Year=1941 To Year=1960
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 842 670 664 462 322 200 82 88 170 382 635 731 5248
60 687 529 509 313 185 79 15 13 63 232 485 576 3687
57 594 444 416 228 114 30 4 2 25 152 395 483 2888
55 532 387 355 174 74 12 1 1 10 108 335 421 2410
50 378 249 204 63 15 1 0 0 0 31 189 268 1396
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