PETERSONS RANCH, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(451760) PETERSONS RANCH
From Year=1953 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	840	681	647	497	329	173	72	70	149	369	629	822	5277
60	685	540	492	351	200	78	20	17	62	226	479	667	3817
57	592	455	400	268	134	39	6	5	29	153	389	574	3043
55	530	399	339	217	97	20	2	2	14	110	330	512	2573
50	375	260	198	106	30	2	0	0	2	35	190	357	1554

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