PORTLAND WB CITY, OREGON

Period of Record General Climate Summary - Heating Degree Days

Station:(356749) PORTLAND WB CITY
From Year=1973 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
65 719 579 516 379 244 107 28 21 76 299 548 728 4241
60 564 437 361 239 123 29 2 1 17 160 398 573 2905
57 471 353 271 163 67 9 0 0 5 92 310 480 2221
55 409 297 213 118 39 3 0 0 1 58 253 419 1810
50 259 167 91 35 5 0 0 0 0 12 126 269 963
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