GRATON, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(043578) GRATON
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	593	439	413	306	188	80	35	35	64	179	389	583	3304
60	438	298	261	168	72	15	2	2	9	68	243	428	2003
57	346	216	177	99	28	3	0	0	1	28	163	336	1397
55	285	164	127	63	12	1	0	0	0	13	116	276	1057
50	147	62	37	12	1	0	0	0	0	1	36	140	436

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