TUCSON INTL AP, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(028820) TUCSON WSO AP
From Year=1930 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	411	294	202	68	9	0	0	0	0	29	190	400	1602
60	262	170	100	25	2	0	0	0	0	10	97	251	917
57	183	112	59	12	1	0	0	0	0	4	59	174	603
55	137	81	39	7	0	0	0	0	0	2	40	130	437
50	56	29	11	1	0	0	0	0	0	0	13	54	164

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