SONOMA, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(048351) SONOMA
From Year=1952 To Year=2005
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	551	388	356	259	141	41	8	8	23	117	355	546	2793
60	396	248	208	132	48	7	0	0	2	34	211	392	1680
57	305	169	131	73	17	2	0	0	0	12	136	300	1146
55	246	122	89	45	8	1	0	0	0	6	95	242	851
50	116	37	22	7	0	0	0	0	0	0	27	114	325

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 Apr 5, 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