PALOMAR MTN OBSVTRY, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(046657) PALOMAR MOUNTAIN OBSERV
From Year=1901 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	687	614	599	433	255	84	6	7	43	219	466	656	4069
60	532	473	446	299	150	38	1	1	17	122	324	502	2905
57	441	390	359	228	103	22	0	1	9	80	246	412	2291
55	382	337	304	187	78	14	0	0	6	60	200	354	1922
50	245	216	186	105	36	4	0	0	2	24	108	223	1150

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