DUTCH HARBOR, ALASKA

Period of Record General Climate Summary - Growing Degree Days

Station:(502587) DUTCH HARBOR
From Year=1951 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	3	3	4	12	71	202	352	413	260	95	23	9	1446
40 S	3	6	10	22	93	295	647	1060	1320	1415	1437	1446	1446
45 M	0	0	0	1	9	66	197	258	119	18	2	0	672
45 S	0	0	0	1	10	76	274	532	651	670	672	672	672
50 M	0	0	0	0	0	7	62	111	28	1	0	0	210
50 S	0	0	0	0	0	8	70	181	210	210	210	210	210
55 M	0	0	0	0	0	1	9	30	3	0	0	0	43
55 S	0	0	0	0	0	1	10	40	43	43	43	43	43
60 M	0	0	0	0	0	0	0	6	0	0	0	0	7
60 S	0	0	0	0	0	0	0	7	7	7	7	7	7

Corn Growing Degree Days
50 M	0	0	0	1	8	36	107	148	64	11	2	0	379
50 S	0	0	1	2	10	46	154	302	365	376	378	379	379

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