HILLSBORO, OREGON

Period of Record General Climate Summary - Heating Degree Days

Station:(353908) HILLSBORO
From Year=1929 To Year=2003
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	812	632	583	423	277	141	48	50	130	375	607	765	4842
60	657	491	428	278	150	50	7	7	45	227	457	610	3407
57	564	406	336	197	88	18	1	1	18	150	368	517	2664
55	502	350	275	148	56	7	0	0	9	106	309	455	2218
50	350	214	139	53	11	0	0	0	1	33	174	304	1279

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