PORT TOWNSEND, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(456678) PORT TOWNSEND
From Year=1891 To Year=2010
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	77	95	164	276	433	542	668	669	544	363	171	90	4092
40 S	77	173	336	612	1045	1587	2255	2925	3468	3832	4003	4092	4092
45 M	17	22	52	134	278	392	513	514	394	211	60	20	2606
45 S	17	39	91	224	502	895	1407	1922	2316	2527	2586	2606	2606
50 M	1	2	7	36	132	243	358	359	245	81	9	1	1475
50 S	1	3	10	47	179	422	780	1140	1384	1465	1474	1475	1475
55 M	0	0	0	5	38	104	204	205	107	14	1	0	678
55 S	0	0	0	6	43	147	351	556	663	677	678	678	678
60 M	0	0	0	0	7	25	72	71	25	1	0	0	201
60 S	0	0	0	0	7	32	104	175	200	201	201	201	201

Corn Growing Degree Days
50 M	7	15	43	104	193	266	366	367	271	132	30	7	1802
50 S	7	22	64	168	362	628	994	1361	1632	1764	1795	1802	1802

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