WALLA WALLA FAA AIRPORT, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(458928) WALLA WALLA FAA AIRPORT
From Year=1949 To Year=2001
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	55	83	191	360	600	808	1080	1052	757	434	134	59	5612
40 S	55	138	329	689	1288	2096	3176	4228	4985	5419	5552	5612	5612
45 M	20	29	82	218	445	658	925	897	607	286	56	20	4242
45 S	20	49	131	348	793	1451	2375	3273	3879	4166	4222	4242	4242
50 M	5	7	25	106	295	508	770	742	458	159	16	4	3095
50 S	5	12	37	143	438	946	1716	2458	2916	3074	3091	3095	3095
55 M	1	1	5	42	167	360	615	587	314	70	3	1	2167
55 S	1	2	7	49	217	576	1191	1778	2092	2163	2166	2167	2167
60 M	0	0	1	13	80	223	460	433	187	24	1	0	1421
60 S	0	0	1	14	93	317	777	1210	1397	1420	1421	1421	1421

Corn Growing Degree Days
50 M	18	31	91	195	344	494	684	674	466	234	50	20	3300
50 S	18	49	141	336	680	1174	1857	2531	2997	3231	3280	3300	3300

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