PETRIFIED FOREST NP, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(026468) PETRIFIED FOREST N P
From Year=1931 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	961	723	607	360	142	14	0	0	29	272	644	936	4687
60	806	582	452	222	60	2	0	0	6	147	494	781	3552
57	713	498	361	152	32	1	0	0	2	93	405	688	2944
55	651	441	303	113	20	0	0	0	1	66	347	626	2569
50	497	303	172	47	5	0	0	0	0	26	214	471	1735

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