SHEMYA AFB, ALASKA

Period of Record General Climate Summary - Growing Degree Days

Station:(508419) SHEMYA USAF BASE
From Year=1949 To Year=1995
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	0	0	0	0	6	74	207	291	236	87	7	0	910
40 S	0	0	0	0	7	81	288	579	815	903	910	910	910
45 M	0	0	0	0	0	4	61	137	91	10	0	0	303
45 S	0	0	0	0	0	4	65	201	293	303	303	303	303
50 M	0	0	0	0	0	0	4	18	6	0	0	0	27
50 S	0	0	0	0	0	0	4	21	27	27	27	27	27
55 M	0	0	0	0	0	0	0	0	0	0	0	0	0
55 S	0	0	0	0	0	0	0	0	0	0	0	0	0
60 M	0	0	0	0	0	0	0	0	0	0	0	0	0
60 S	0	0	0	0	0	0	0	0	0	0	0	0	0

Corn Growing Degree Days
50 M	0	0	0	0	0	1	12	34	21	1	0	0	69
50 S	0	0	0	0	0	1	13	47	68	69	69	69	69

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