SAINT JOHNS, ARIZONA

Period of Record General Climate Summary - Cooling Degree Days

Station:(027435) SAINT JOHNS
From Year=1901 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	0	0	3	38	182	415	582	518	314	67	1	0	2120
57	0	0	1	22	134	356	520	456	256	41	0	0	1786
60	0	0	0	7	77	268	427	363	173	16	0	0	1332
65	0	0	0	1	19	137	272	209	62	1	0	0	702
70	0	0	0	0	3	47	126	74	10	0	0	0	259

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