MT LEMMON, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(025732) MOUNT LEMMON
From Year=1958 To Year=2010
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	898	847	798	563	376	150	69	105	218	494	660	853	6033
60	743	706	643	413	227	56	7	15	88	340	510	698	4445
57	650	621	550	323	144	21	1	2	41	249	420	605	3627
55	588	565	488	263	96	9	0	0	22	194	361	543	3128
50	433	424	333	128	17	0	0	0	5	84	217	388	2027

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