SKAGIT POWER PLANT, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457690) SKAGIT POWER PLANT
From Year=1931 To Year=1958
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	968	779	715	458	263	156	65	63	158	416	692	874	5607
60	813	638	560	313	140	60	15	11	69	268	542	719	4148
57	720	553	468	231	83	26	5	2	34	188	452	626	3387
55	658	497	407	181	53	12	2	0	19	141	392	564	2926
50	503	356	260	80	12	1	0	0	2	55	246	409	1924

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