HALF MOON BAY, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(043714) HALF MOON BAY
From Year=1939 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	446	384	409	372	324	253	216	190	181	249	332	431	3788
60	292	245	255	224	172	108	71	53	54	109	187	277	2048
57	203	164	166	140	89	40	18	11	13	46	109	188	1187
55	148	115	112	88	45	14	4	3	3	20	67	135	755
50	48	29	23	12	2	0	0	0	0	1	10	39	165

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