PETALUMA FIRE STN 3, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(046826) PETALUMA FIRE STN 3
From Year=1948 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	546	396	374	283	177	69	20	16	30	123	339	535	2908
60	391	256	223	147	63	10	1	0	2	34	196	380	1703
57	299	175	141	81	23	2	0	0	0	11	122	288	1144
55	240	127	95	48	9	0	0	0	0	5	82	230	838
50	111	40	22	8	0	0	0	0	0	0	22	105	309

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 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