KETCHUM RS, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(104845) KETCHUM RANGER STN
From Year=1973 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	6	77	238	428	685	624	362	124	8	0	2553
40 S	0	0	6	83	322	750	1435	2059	2421	2545	2553	2553	2553
45 M	0	0	1	28	128	286	530	469	228	50	1	0	1720
45 S	0	0	1	28	156	442	973	1442	1669	1719	1720	1720	1720
50 M	0	0	0	7	55	163	377	318	116	14	0	0	1051
50 S	0	0	0	7	62	225	602	921	1037	1051	1051	1051	1051
55 M	0	0	0	1	17	71	232	179	41	2	0	0	542
55 S	0	0	0	1	17	88	320	499	540	542	542	542	542
60 M	0	0	0	0	4	20	108	69	8	0	0	0	208
60 S	0	0	0	0	4	24	132	201	208	208	208	208	208

Corn Growing Degree Days
50 M	0	1	14	83	193	308	470	447	294	140	16	0	1965
50 S	0	1	15	97	290	597	1067	1514	1809	1949	1965	1965	1965

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