PORTLAND WSO CITY, OREGON

Period of Record General Climate Summary - Cooling Degree Days

Station:(356761) PORTLAND WSO CITY
From Year=1928 To Year=1973
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	9	43	148	257	422	418	281	91	4	1	1677
57	0	1	4	27	109	201	360	356	225	59	2	0	1343
60	0	0	1	12	65	128	268	264	148	28	0	0	914
65	0	0	0	3	23	51	132	126	59	5	0	0	399
70	0	0	0	0	6	17	50	44	17	1	0	0	135

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