DUNCAN, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(022754) DUNCAN
From Year=1901 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	728	554	434	216	56	2	0	0	5	154	490	735	3372
60	573	413	283	101	14	0	0	0	0	62	341	580	2368
57	480	329	199	55	6	0	0	0	0	31	255	487	1842
55	418	274	150	34	3	0	0	0	0	18	201	425	1525
50	267	150	60	8	0	0	0	0	0	4	92	274	856

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