PORTHILL, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(107264) PORTHILL
From Year=1892 To Year=2012
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	1	3	30	192	434	604	818	763	463	173	19	2	3503
40 S	1	4	34	225	660	1264	2082	2846	3309	3482	3501	3503	3503
45 M	0	0	4	86	284	455	663	608	317	72	3	0	2492
45 S	0	0	4	90	374	828	1492	2100	2417	2489	2492	2492	2492
50 M	0	0	0	28	154	307	509	454	184	21	0	0	1657
50 S	0	0	0	28	182	489	998	1452	1636	1657	1657	1657	1657
55 M	0	0	0	6	66	173	355	302	84	3	0	0	989
55 S	0	0	0	6	72	245	600	902	986	989	989	989	989
60 M	0	0	0	1	20	75	211	166	26	0	0	0	499
60 S	0	0	0	1	21	96	307	473	499	499	499	499	499

Corn Growing Degree Days
50 M	0	1	24	137	275	364	509	480	302	116	6	0	2214
50 S	0	1	25	162	438	801	1311	1790	2092	2208	2214	2214	2214

M = Monthly Data
S - Running sum of monthly data.
Growing 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.
Corn Growing Degree Day units have the limitations that the maximum daily temperatures greater than 86 F are set to 86 F and minimums less than 50 F are set to 50 F.
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