PETALUMA AP, CALIFORNIA

Period of Record General Climate Summary - Cooling Degree Days

Station:(046826) PETALUMA FIRE STN 3
From Year=1893 To Year=2012
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	5	13	32	66	146	270	358	359	330	204	42	6	1832
57	2	6	16	40	100	211	296	297	271	150	23	2	1413
60	1	1	4	17	50	131	204	206	185	83	7	0	889
65	0	0	0	3	14	45	73	73	71	21	1	0	301
70	0	0	0	0	3	13	16	15	19	3	0	0	70

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 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