CHULA VISTA, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(041758) CHULA VISTA
From Year=1918 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	342	280	266	192	115	53	7	2	15	74	196	318	1859
60	196	149	124	68	20	3	0	0	0	12	76	170	817
57	119	83	59	24	4	0	0	0	0	2	31	95	417
55	77	49	29	10	1	0	0	0	0	1	14	56	236
50	15	7	2	0	0	0	0	0	0	0	1	8	32

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