PORTLAND WSFO, OREGON

Period of Record General Climate Summary - Heating Degree Days

Station:(356751) PORTLAND WSFO
From Year=1941 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
65 786 614 563 412 247 103 24 20 88 328 570 752 4506
60 631 473 408 266 123 27 2 1 22 184 420 597 3154
57 538 388 316 185 66 7 0 0 7 112 331 504 2455
55 476 332 255 136 38 2 0 0 3 75 273 443 2034
50 324 197 120 43 5 0 0 0 0 19 143 291 1142
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