WILLAPA HARBOR, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(459291) WILLAPA HARBOR
From Year=1948 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	79	114	152	253	434	548	679	692	599	402	186	107	4243
40 S	79	193	344	597	1031	1579	2257	2950	3549	3950	4136	4243	4243
45 M	21	34	49	116	279	398	524	537	449	250	75	30	2761
45 S	21	54	103	219	498	896	1420	1957	2406	2656	2731	2761	2761
50 M	1	5	9	35	139	249	369	382	299	118	15	3	1624
50 S	1	6	15	50	189	437	806	1188	1488	1606	1621	1624	1624
55 M	0	0	0	8	50	114	214	228	157	36	1	0	807
55 S	0	0	1	8	58	172	386	614	770	807	807	807	807
60 M	0	0	0	1	14	36	83	89	52	6	0	0	280
60 S	0	0	0	1	15	51	133	222	274	280	280	280	280

Corn Growing Degree Days
50 M	13	34	62	121	223	283	379	391	333	197	61	18	2114
50 S	13	48	110	231	454	737	1116	1507	1839	2036	2097	2114	2114

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