OLYMPIA WSO AP, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(456114) OLYMPIA WSO AP
From Year=1948 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	833	684	664	517	354	198	92	86	205	460	662	812	5567
60	678	543	509	367	210	81	19	15	86	307	512	657	3983
57	585	458	416	280	135	34	4	3	38	219	422	564	3158
55	523	402	355	224	92	16	1	1	20	165	362	502	2662
50	370	263	205	101	22	1	0	0	3	63	220	349	1596

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