PORTHILL, IDAHO

Period of Record General Climate Summary - Cooling Degree Days

Station:(107264) PORTHILL
From Year=1948 To Year=2006
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	6	75	189	358	320	95	2	0	0	1044
57	0	0	0	3	50	143	298	262	64	1	0	0	819
60	0	0	0	1	23	86	214	181	31	0	0	0	536
65	0	0	0	0	5	28	99	75	6	0	0	0	213
70	0	0	0	0	1	5	28	18	1	0	0	0	52

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 Jul 28, 2006
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