SAN MIGUEL ISLAND, wr

Period of Record General Climate Summary - Heating Degree Days

Station:(967803) SAN MIGUEL ISLAND
From Year=1981 To Year=2002
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	325	308	339	265	255	164	95	92	112	153	252	265	2627
60	173	165	188	131	116	45	12	11	15	37	115	132	1140
57	92	86	106	64	48	12	0	0	1	6	48	71	533
55	46	36	61	32	16	3	0	0	0	2	21	36	254
50	0	0	4	5	0	0	0	0	0	0	0	1	10

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 Sep 17, 2007
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