ARROWROCK DAM, IDAHO

Period of Record General Climate Summary - Cooling Degree Days

Station:(100448) ARROWROCK DAM
From Year=1911 To Year=2012
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	0	0	0	23	122	290	573	541	253	40	0	0	1842
57	0	0	0	14	90	239	511	480	206	26	0	0	1566
60	0	0	0	6	55	171	420	390	143	11	0	0	1195
65	0	0	0	1	19	83	273	247	66	2	0	0	690
70	0	0	0	0	4	30	146	123	25	0	0	0	327

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