TROUTDALE SUBSTATION, OREGON

Period of Record General Climate Summary - Heating Degree Days

Station:(358634) TROUTDALE SUBSTATION
From Year=1948 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	796	619	551	399	247	108	30	29	106	324	564	758	4532
60	641	478	396	255	125	32	3	2	31	183	414	603	3163
57	548	393	305	175	69	10	0	0	11	113	326	510	2459
55	486	337	246	127	41	3	0	0	5	75	268	448	2036
50	335	202	116	39	6	0	0	0	0	19	138	297	1151

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 Jul 28, 2006
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