TOMBSTONE, ARIZONA

Period of Record General Climate Summary - Cooling Degree Days

Station:(028619) TOMBSTONE
From Year=1893 To Year=2012
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	11	25	86	227	455	702	756	691	578	334	84	13	3963
57	5	13	58	178	395	642	694	629	518	277	55	6	3471
60	1	4	28	114	307	552	601	536	428	196	24	1	2793
65	0	0	5	39	172	403	446	381	280	87	4	0	1816
70	0	0	0	7	68	256	291	227	140	24	0	0	1015

Cooling Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. 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