MUD MTN DAM, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(455704) MUD MOUNTAIN DAM
From Year=1939 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	862	723	727	584	428	281	149	139	239	470	677	834	6113
60	707	581	572	435	284	154	55	45	122	320	527	679	4481
57	614	497	479	348	205	92	22	15	68	235	438	586	3599
55	552	440	417	292	157	59	9	5	41	183	378	524	3059
50	399	302	269	163	62	10	1	0	7	78	237	370	1899

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