PORTHILL, IDAHO

Period of Record General Climate Summary - Heating Degree Days

Station:(107264) PORTHILL
From Year=1948 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1246	993	878	567	331	155	53	69	272	636	932	1177	7310
60	1091	852	723	418	194	64	12	20	147	481	782	1022	5807
57	998	768	630	330	127	31	4	7	90	389	692	929	4995
55	936	711	568	273	91	17	2	3	61	328	632	867	4488
50	781	570	414	144	28	2	0	0	17	188	482	712	3338

Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. 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