WILLAPA HARBOR, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(459291) WILLAPA HARBOR
From Year=1895 To Year=1979
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	84	110	161	267	419	530	670	684	580	416	195	110	4228
40 S	84	194	355	622	1042	1572	2242	2927	3507	3923	4118	4228	4228
45 M	23	33	57	132	266	380	515	529	430	265	82	32	2744
45 S	23	56	113	245	511	891	1406	1936	2366	2631	2712	2744	2744
50 M	2	5	14	47	128	232	360	374	281	131	19	4	1597
50 S	2	8	22	69	197	429	789	1163	1444	1575	1593	1597	1597
55 M	0	0	3	13	45	101	206	220	141	43	2	0	775
55 S	0	1	3	16	61	162	369	589	730	773	775	775	775
60 M	0	0	0	3	13	31	79	85	47	8	0	0	266
60 S	0	0	0	3	16	47	125	211	258	266	266	266	266

Corn Growing Degree Days
50 M	17	37	69	131	210	270	373	385	319	206	69	22	2106
50 S	17	53	122	253	463	733	1106	1491	1810	2015	2084	2106	2106

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