FLAGSTAFF PULLIAM AP, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(023010) FLAGSTAFF WSO AP
From Year=1893 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	1124	949	890	653	430	174	28	55	220	545	837	1082	6988
60	969	808	735	503	280	76	2	7	96	391	687	927	5481
57	876	723	642	414	197	39	0	2	49	300	597	834	4673
55	814	666	580	355	149	23	0	1	29	242	537	772	4169
50	659	525	425	216	64	5	0	0	6	120	388	617	3025

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