FOREST GROVE, OREGON

Period of Record General Climate Summary - Growing Degree Days

Station:(352997) FOREST GROVE
From Year=1893 To Year=2012
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	61	94	184	311	505	653	839	840	661	401	159	71	4779
40 S	61	155	339	650	1155	1809	2648	3488	4149	4550	4709	4779	4779
45 M	16	27	74	173	351	503	684	685	511	252	64	19	3359
45 S	16	43	117	290	641	1144	1828	2513	3024	3276	3339	3359	3359
50 M	2	5	19	76	207	353	529	530	362	125	14	3	2224
50 S	2	6	25	101	308	661	1190	1721	2082	2207	2222	2224	2224
55 M	0	0	3	24	101	210	374	375	221	43	1	0	1354
55 S	0	0	3	28	128	339	713	1089	1309	1353	1354	1354	1354
60 M	0	0	0	6	40	100	226	226	107	10	0	0	715
60 S	0	0	0	6	46	146	372	598	705	715	715	715	715

Corn Growing Degree Days
50 M	13	37	95	179	296	387	518	521	405	227	57	14	2750
50 S	13	50	145	325	621	1008	1527	2047	2452	2680	2736	2750	2750

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