MCNARY DAM, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(455231) MC NARY DAM
From Year=1954 To Year=2008
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	950	731	592	366	167	40	3	4	67	335	663	899	4815
60	795	590	437	223	70	8	0	0	18	197	513	744	3595
57	702	505	345	147	33	2	0	0	6	127	424	651	2942
55	640	448	284	103	17	1	0	0	3	89	365	589	2539
50	486	309	145	27	1	0	0	0	0	27	226	436	1658

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