DUTCH HARBOR, ALASKA

Period of Record General Climate Summary - Growing Degree Days

Station:(502587) DUTCH HARBOR
From Year=1951 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	3	3	4	12	73	203	358	418	257	93	22	8	1455
40 S	3	6	10	22	95	298	656	1073	1331	1424	1446	1455	1455
45 M	0	0	0	1	9	68	203	263	117	18	2	0	681
45 S	0	0	0	1	10	78	281	544	661	679	681	681	681
50 M	0	0	0	0	0	8	64	116	28	1	0	0	218
50 S	0	0	0	0	0	9	73	189	217	218	218	218	218
55 M	0	0	0	0	0	1	9	32	3	0	0	0	45
55 S	0	0	0	0	0	1	10	43	45	45	45	45	45
60 M	0	0	0	0	0	0	1	7	0	0	0	0	8
60 S	0	0	0	0	0	0	1	7	8	8	8	8	8

Corn Growing Degree Days
50 M	0	0	0	1	8	39	111	153	66	12	2	1	393
50 S	0	1	1	2	9	48	159	313	378	390	393	393	393

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