PETALUMA FIRE STN 3, CALIFORNIA

Period of Record General Climate Summary - Cooling Degree Days

Station:(046826) PETALUMA FIRE STN 3
From Year=1948 To Year=2006
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	5	14	31	69	157	280	371	380	349	214	44	5	1917
57	1	6	15	41	108	222	309	318	289	158	24	2	1493
60	0	1	4	17	56	140	217	225	201	89	8	0	956
65	0	0	0	3	15	49	81	86	79	22	0	0	335
70	0	0	0	0	3	14	18	17	21	3	0	0	78

Cooling Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. 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