RITZVILLE 1 SSE, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457059) RITZVILLE
From Year=1899 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	1159	900	759	524	315	136	31	37	165	482	846	1104	6457
60	1004	758	604	378	189	57	7	9	81	335	696	949	5067
57	911	673	511	295	127	28	2	3	46	254	606	856	4312
55	849	617	449	243	92	15	1	1	30	204	546	794	3841
50	694	476	299	128	31	2	0	0	7	101	398	639	2776

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