SAN RAFAEL RCH SP, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(027555) SAN RAFAEL RANCH
From Year=1892 To Year=2009
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	693	599	532	351	141	15	1	2	10	159	452	660	3615
60	538	457	378	209	60	2	0	0	2	65	302	505	2518
57	445	373	288	132	33	0	0	0	1	31	217	412	1932
55	383	317	229	91	19	0	0	0	0	17	166	350	1575
50	235	190	110	27	4	0	0	0	0	3	73	203	845

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