SMYRNA, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457727) SMYRNA
From Year=1951 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	22	47	174	376	649	849	1084	1044	724	378	87	21	5454
40 S	22	69	243	619	1268	2117	3201	4245	4969	5347	5434	5454	5454
45 M	5	13	72	232	494	699	929	889	574	238	31	5	4182
45 S	5	18	91	323	817	1516	2445	3334	3908	4146	4177	4182	4182
50 M	1	2	19	113	341	549	774	734	425	123	8	1	3091
50 S	1	4	22	135	477	1026	1800	2534	2959	3082	3090	3091	3091
55 M	0	0	3	40	203	400	619	579	283	50	1	0	2179
55 S	0	0	4	44	247	647	1266	1845	2127	2177	2179	2179	2179
60 M	0	0	0	10	100	257	464	425	158	13	0	0	1428
60 S	0	0	0	10	111	367	832	1256	1414	1427	1428	1428	1428

Corn Growing Degree Days
50 M	11	31	125	249	406	530	669	647	468	265	49	11	3461
50 S	11	42	167	417	823	1353	2021	2669	3136	3401	3450	3461	3461

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