SEATTLE JACKSON PARK, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457459) SEATTLE JACKSON PARK
From Year=1961 To Year=1986
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	794	622	616	486	318	166	76	65	172	402	617	773	5107
60	639	480	461	338	178	58	12	8	63	251	467	618	3573
57	546	396	368	251	106	20	2	1	25	167	377	525	2785
55	484	340	306	196	67	8	1	0	12	119	318	463	2315
50	331	204	162	77	10	0	0	0	1	35	180	310	1311

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