PORTLAND RFC 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