PORTLAND WB CITY, OREGON

Period of Record General Climate Summary - Cooling Degree Days

Station:(356749) PORTLAND WB CITY
From Year=1973 To Year=2012
Cooling Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
55 0 1 7 42 124 245 408 423 291 73 5 1 1621
57 0 0 3 27 91 191 346 361 234 45 2 0 1300
60 0 0 0 12 53 122 255 269 157 19 0 0 889
65 0 0 0 2 19 49 126 134 65 3 0 0 399
70 0 0 0 0 5 16 48 50 18 0 0 0 138
Cooling Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. 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