HEALDSBURG, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(043875) HEALDSBURG
From Year=1893 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	542	387	336	221	109	27	6	7	23	115	328	528	2631
60	387	248	192	102	32	3	1	0	3	35	188	373	1564
57	296	169	119	52	11	1	1	0	1	12	116	282	1059
55	236	123	79	30	4	0	1	0	0	5	77	224	780
50	108	40	18	4	0	0	1	0	0	0	18	100	289

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