GRAYS RIVER HATCHERY, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(453333) GRAYS RIVER HATCHERY
From Year=1962 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	774	644	636	520	382	242	135	126	201	424	617	763	5461
60	619	502	481	371	237	115	39	34	85	271	467	608	3829
57	526	417	388	284	159	58	11	9	39	186	377	515	2971
55	464	361	326	229	113	31	4	3	20	135	317	453	2457
50	311	224	181	106	32	3	0	0	2	43	177	300	1377

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