TACOMA CITY HALL, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(458286) TACOMA WB CITY
From Year=1933 To Year=1981
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	784	612	606	449	287	148	61	54	151	368	574	705	4799
60	629	471	451	302	151	47	7	4	50	218	424	550	3305
57	536	387	359	217	84	16	1	0	19	139	335	457	2549
55	474	331	297	165	50	6	0	0	9	95	276	395	2098
50	321	196	155	59	7	0	0	0	1	25	144	244	1152

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