TROUTDALE, OREGON

Period of Record General Climate Summary - Heating Degree Days

Station:(358634) TROUTDALE SUBSTATION
From Year=1948 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	794	623	559	406	257	116	32	30	105	330	567	765	4585
60	639	482	404	262	133	36	3	2	31	188	418	610	3207
57	546	397	312	182	75	11	0	0	11	117	329	517	2498
55	484	341	253	134	45	4	0	0	5	78	271	456	2070
50	333	206	121	43	7	0	0	0	0	20	140	304	1174

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