PRESTON, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(107346) PRESTON
From Year=1964 To Year=2006
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	54	184	434	644	912	887	555	239	32	3	3947
40 S	1	4	58	242	676	1320	2231	3119	3674	3912	3944	3947	3947
45 M	0	0	16	91	292	495	757	732	410	126	7	0	2927
45 S	0	1	17	108	400	895	1652	2384	2794	2920	2927	2927	2927
50 M	0	0	3	36	173	349	602	578	274	51	0	0	2065
50 S	0	0	3	39	211	561	1162	1740	2014	2065	2065	2065	2065
55 M	0	0	0	10	84	218	448	424	156	13	0	0	1351
55 S	0	0	0	10	93	311	759	1183	1339	1351	1351	1351	1351
60 M	0	0	0	2	28	110	297	274	66	1	0	0	778
60 S	0	0	0	2	30	140	437	711	777	778	778	778	778

Corn Growing Degree Days
50 M	0	4	53	142	290	415	575	564	385	199	31	2	2659
50 S	0	4	57	199	489	904	1479	2043	2428	2627	2657	2659	2659

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 Jul 28, 2006
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