PORTAL, ARIZONA

Period of Record General Climate Summary - Cooling Degree Days

Station:(026706) PORTAL
From Year=1914 To Year=1955
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	1	4	22	151	284	536	623	554	441	176	20	2	2815
57	0	2	12	113	230	476	561	492	381	134	10	1	2414
60	0	1	5	65	159	387	468	399	294	82	3	0	1862
65	0	1	1	19	71	245	313	245	159	23	0	0	1077
70	0	0	1	3	20	128	169	110	63	2	0	0	495

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