MC NARY DAM, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(455231) MC NARY DAM
From Year=1954 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	947	731	592	362	167	40	4	4	66	333	662	899	4807
60	792	590	437	220	70	8	0	0	18	195	513	744	3587
57	699	505	345	145	33	2	0	0	6	126	423	651	2935
55	637	449	284	101	17	1	0	0	3	88	365	589	2534
50	483	310	145	26	1	0	0	0	0	26	226	435	1653

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 Jul 28, 2006
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