PORTHILL, IDAHO

Period of Record General Climate Summary - Heating Degree Days

Station:(107264) PORTHILL
From Year=1892 To Year=2012
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1262	1027	890	571	345	169	53	77	292	626	934	1169	7414
60	1107	885	735	422	206	71	13	23	163	471	784	1014	5894
57	1014	801	642	334	136	34	4	9	102	379	694	921	5070
55	952	744	580	277	96	19	2	4	71	319	634	859	4557
50	797	603	425	149	30	3	0	1	21	182	484	704	3399

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 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