MCCALL, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(105708) MCCALL
From Year=1905 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	0	5	58	243	438	701	648	380	138	10	0	2622
40 S	0	0	6	64	308	746	1446	2094	2474	2612	2622	2622	2622
45 M	0	0	0	20	131	295	546	493	244	57	1	0	1788
45 S	0	0	0	20	151	446	992	1485	1730	1787	1788	1788	1788
50 M	0	0	0	5	57	170	392	342	132	15	0	0	1114
50 S	0	0	0	5	62	233	625	967	1099	1114	1114	1114	1114
55 M	0	0	0	1	19	79	245	201	53	3	0	0	600
55 S	0	0	0	1	20	98	344	545	598	600	600	600	600
60 M	0	0	0	0	4	26	119	86	13	0	0	0	248
60 S	0	0	0	0	4	30	149	235	248	248	248	248	248

Corn Growing Degree Days
50 M	0	1	11	63	183	296	478	461	305	141	11	0	1949
50 S	0	1	12	75	259	554	1032	1492	1797	1938	1949	1949	1949

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