WALLA WALLA WSO, WASHINGTON

Period of Record General Climate Summary - Cooling Degree Days

Station:(458931) WALLA WALLA WB CITY
From Year=1916 To Year=1987
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	1	2	7	46	179	375	622	583	300	68	4	1	2188
57	0	1	3	30	138	318	561	521	247	45	2	1	1866
60	0	0	1	15	87	237	468	428	175	22	1	0	1435
65	0	0	0	4	35	128	318	281	83	4	0	0	853
70	0	0	0	0	11	57	186	155	29	0	0	0	439

Cooling Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. 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