LEWISTON NEZ PERCE CO AP, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(105241) LEWISTON WSO AP
From Year=1948 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	33	59	156	325	577	777	1061	1032	730	373	99	30	5252
40 S	33	92	249	573	1150	1927	2989	4020	4750	5123	5222	5252	5252
45 M	7	15	61	188	423	627	906	877	580	231	34	6	3954
45 S	7	22	83	270	693	1320	2226	3103	3683	3914	3948	3954	3954
50 M	1	2	16	88	276	477	751	722	432	116	7	1	2889
50 S	1	3	19	107	383	860	1611	2333	2765	2881	2888	2889	2889
55 M	0	0	2	34	154	331	596	567	290	46	1	0	2021
55 S	0	0	2	36	190	521	1117	1684	1974	2020	2021	2021	2021
60 M	0	0	0	9	72	198	442	413	168	14	0	0	1317
60 S	0	0	0	10	81	279	721	1134	1303	1317	1317	1317	1317

Corn Growing Degree Days
50 M	7	23	81	183	334	472	666	648	446	206	34	7	3107
50 S	7	30	111	294	628	1100	1767	2414	2860	3066	3100	3107	3107

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