RITZVILLE, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457059) RITZVILLE
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	1157	884	768	537	330	141	39	42	172	498	849	1105	6521
60	1002	743	613	390	201	61	9	10	85	350	699	950	5113
57	909	658	520	306	137	30	3	3	50	267	609	857	4348
55	847	602	458	252	100	17	1	1	32	216	549	795	3870
50	692	461	307	134	35	2	0	0	8	108	401	640	2787

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