SITKUM 1 E, OREGON

Period of Record General Climate Summary - Growing Degree Days

Station:(357866) SITKUM
From Year=1944 To Year=1969
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	99	152	183	292	453	575	711	726	620	443	219	137	4610
40 S	99	250	433	725	1178	1753	2464	3190	3810	4253	4472	4610	4610
45 M	31	61	72	154	299	425	556	571	470	291	100	49	3079
45 S	31	92	163	317	616	1041	1598	2168	2639	2929	3029	3079	3079
50 M	4	14	18	58	157	276	401	416	321	153	29	9	1857
50 S	4	18	36	94	251	527	929	1344	1665	1818	1847	1857	1857
55 M	0	2	3	16	56	138	247	261	178	56	4	1	961
55 S	0	2	4	20	77	215	461	722	901	956	961	961	961
60 M	0	0	0	3	13	45	105	118	67	12	0	0	365
60 S	0	0	0	4	17	62	167	285	352	365	365	365	365

Corn Growing Degree Days
50 M	30	65	88	163	252	332	437	445	376	237	88	41	2555
50 S	30	95	183	346	598	930	1367	1812	2188	2425	2513	2555	2555

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