EL CAJON, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(042706) EL CAJON
From Year=1979 To Year=2012
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	280	231	186	96	36	5	0	0	2	24	152	302	1313
60	140	109	68	25	3	0	0	0	0	3	53	156	557
57	76	54	27	8	0	0	0	0	0	1	23	87	275
55	45	30	12	3	0	0	0	0	0	0	11	54	155
50	6	4	1	0	0	0	0	0	0	0	1	10	22

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 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