IDYLLWILD FIRE DEPT, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(044211) IDYLLWILD FIRE DEPT
From Year=1943 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	755	663	666	502	331	128	20	27	97	310	553	721	4773
60	600	522	511	355	199	55	2	5	38	181	404	566	3439
57	508	437	419	273	136	30	0	2	20	119	317	473	2734
55	446	382	359	222	102	20	0	1	12	86	262	411	2304
50	298	248	220	118	43	6	0	0	3	33	147	264	1381

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