SANTA ROSA, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(047965) SANTA ROSA
From Year=1931 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	400	368	268	166	64	24	20	35	127	343	530	2897
60	396	260	219	136	57	10	1	1	3	39	200	375	1695
57	304	180	139	73	20	2	0	0	1	14	126	284	1142
55	245	131	95	42	8	1	0	0	0	6	86	225	839
50	115	43	24	6	1	0	0	0	0	1	21	101	311

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