SMYRNA, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457727) SMYRNA
From Year=1951 To Year=2008
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	21	47	174	372	651	850	1089	1042	724	377	88	20	5456
40 S	21	68	242	615	1266	2116	3204	4247	4971	5348	5436	5456	5456
45 M	5	13	73	229	496	700	934	887	574	236	31	5	4184
45 S	5	18	90	320	816	1516	2449	3337	3911	4147	4179	4184	4184
50 M	1	2	19	111	343	550	779	732	425	122	8	1	3095
50 S	1	3	22	134	477	1027	1806	2538	2964	3086	3094	3095	3095
55 M	0	0	3	39	205	400	624	577	283	49	1	0	2183
55 S	0	0	4	43	248	648	1272	1850	2132	2181	2183	2183	2183
60 M	0	0	0	10	102	257	469	423	158	13	0	0	1432
60 S	0	0	0	10	112	368	838	1261	1419	1432	1432	1432	1432

Corn Growing Degree Days
50 M	11	31	125	248	408	530	671	646	468	264	50	11	3464
50 S	11	42	168	416	824	1354	2025	2671	3139	3403	3453	3464	3464

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