EL CAJON 2 E, CALIFORNIA

Period of Record General Climate Summary - Cooling Degree Days

Station:(042705) EL CAJON YALE RANCH
From Year=1899 To Year=1959
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	25	41	75	148	256	382	551	572	487	311	139	43	3030
57	12	22	45	103	197	323	489	510	427	250	97	23	2499
60	4	8	17	51	119	234	396	417	337	166	50	7	1806
65	1	1	2	10	31	100	242	263	192	62	12	0	915
70	0	0	0	1	4	24	101	119	79	16	2	0	348

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