WINDOW ROCK 4 SW, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(029410) WINDOW ROCK 4 SW
From Year=1937 To Year=1999
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1130	910	833	574	336	90	8	15	152	474	815	1089	6426
60	975	769	678	424	194	28	2	1	58	321	665	934	5050
57	882	684	586	336	125	12	1	0	27	234	575	841	4304
55	820	628	524	280	89	6	1	0	16	183	515	779	3839
50	665	487	371	157	33	1	0	0	3	83	365	624	2788

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