FLAGSTAFF 4 SW, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(023009) FLAGSTAFF 4 SW
From Year=1984 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	1185	1010	935	714	517	275	87	115	309	637	921	1187	7893
60	1030	869	780	564	364	146	20	30	171	482	771	1032	6259
57	937	784	687	475	275	87	6	10	104	391	681	939	5375
55	875	728	625	415	220	57	2	4	69	331	621	877	4824
50	720	587	470	270	105	15	0	0	20	191	472	722	3570

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