MAYFIELD PWR PLT, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(455110) MAYFIELD POWER PLANT
From Year=1980 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	811	713	669	476	344	216	76	25	106	410	699	890	5433
60	656	570	514	335	202	89	18	1	28	257	549	735	3952
57	563	485	421	256	128	39	4	0	4	170	459	642	3170
55	501	428	359	206	84	18	2	0	0	121	399	580	2697
50	346	285	206	100	19	0	0	0	0	37	249	425	1667

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