GRAND CANYON HQ, ARIZONA

Period of Record General Climate Summary - Cooling Degree Days

Station:(023591) GRAND CANYON NATL PARK
From Year=1903 To Year=1957
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	0	0	0	9	82	276	441	374	210	29	1	0	1422
57	0	0	0	4	53	223	380	313	159	15	0	0	1146
60	0	0	0	1	22	153	288	223	92	4	0	0	783
65	0	0	0	0	2	61	146	90	22	0	0	0	322
70	0	0	0	0	0	14	45	16	2	0	0	0	77

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