PORTLAND WSO CITY, OREGON

Period of Record General Climate Summary - Heating Degree Days

Station:(356761) PORTLAND WSO CITY
From Year=1928 To Year=1973
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 773 582 527 366 211 95 20 18 80 276 529 689 4165
60 618 441 373 225 98 22 1 1 19 143 379 534 2854
57 525 357 284 150 49 5 0 0 6 81 290 441 2188
55 463 301 226 106 27 1 0 0 2 51 233 380 1791
50 313 170 101 30 2 0 0 0 0 11 111 232 970
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