ARROWROCK DAM, IDAHO

Period of Record General Climate Summary - Heating Degree Days

Station:(100448) ARROWROCK DAM
From Year=1911 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	1208	947	796	509	284	104	12	17	139	455	825	1119	6415
60	1053	806	641	364	165	42	3	5	65	310	675	964	5093
57	960	721	548	282	108	21	2	2	38	231	585	871	4368
55	898	665	486	231	77	12	1	1	25	184	525	809	3914
50	743	523	336	123	27	2	1	0	7	89	377	654	2881

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