POWELL, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(107320) POWELL
From Year=1962 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	0	1	12	90	289	505	740	704	419	140	7	0	2907
40 S	0	1	13	103	392	897	1638	2342	2760	2900	2907	2907	2907
45 M	0	0	1	34	166	358	585	549	277	59	1	0	2031
45 S	0	0	1	35	201	559	1145	1694	1971	2030	2031	2031	2031
50 M	0	0	0	10	80	225	431	396	158	18	0	0	1318
50 S	0	0	0	10	90	315	746	1142	1300	1318	1318	1318	1318
55 M	0	0	0	2	30	119	283	251	71	3	0	0	759
55 S	0	0	0	2	32	151	434	685	756	759	759	759	759
60 M	0	0	0	0	8	49	152	128	22	0	0	0	359
60 S	0	0	0	0	8	57	209	337	359	359	359	359	359

Corn Growing Degree Days
50 M	0	3	27	93	224	330	485	473	323	137	7	0	2100
50 S	0	3	29	122	346	676	1161	1633	1956	2093	2100	2100	2100

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