ARIEL DAM, WASHINGTON

Period of Record General Climate Summary - Cooling Degree Days

Station:(450242) ARIEL DAM
From Year=1930 To Year=1971
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	0	-99	-99	22	81	182	256	-99	223	74	0	0	-99
57	0	-99	-99	13	54	134	197	-99	173	52	0	0	-99
60	0	-99	-99	3	25	79	125	-99	110	22	0	0	-99
65	0	-99	-99	0	3	22	32	-99	34	2	0	0	-99
70	0	-99	-99	0	0	4	6	-99	5	0	0	0	-99

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