OMAK AP, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(456123) OMAK 2 NW
From Year=1909 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	1291	992	761	449	224	71	13	22	151	501	885	1180	6541
60	1136	851	606	304	112	20	2	4	66	352	735	1025	5211
57	1043	766	513	223	64	7	0	1	34	267	645	932	4497
55	981	710	452	174	41	3	0	0	20	215	585	870	4052
50	826	569	303	77	9	0	0	0	4	108	435	715	3046

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