PORTLAND WSFO, OREGON

Period of Record General Climate Summary - Growing Degree Days

Station:(356751) PORTLAND WSFO
From Year=1941 To Year=2006
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	78	120	218	340	538	689	874	878	702	448	195	88	5168
40 S	78	197	415	755	1294	1983	2856	3734	4437	4885	5080	5168	5168
45 M	22	38	91	194	384	539	719	723	552	296	85	25	3668
45 S	22	60	151	345	729	1268	1987	2709	3262	3558	3643	3668	3668
50 M	3	7	23	82	234	389	564	568	402	158	22	4	2455
50 S	3	10	33	115	348	737	1301	1869	2271	2429	2451	2455	2455
55 M	0	0	3	25	112	241	409	413	255	59	3	0	1521
55 S	0	1	3	29	141	382	791	1204	1459	1518	1521	1521	1521
60 M	0	0	0	5	42	116	256	259	126	13	0	0	816
60 S	0	0	0	5	47	162	418	677	803	816	816	816	816

Corn Growing Degree Days
50 M	15	39	93	165	281	392	546	552	414	223	60	16	2797
50 S	15	54	147	313	594	986	1532	2084	2498	2721	2781	2797	2797

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