SEWARD, ALASKA

Period of Record General Climate Summary - Growing Degree Days

Station:(508371) SEWARD
From Year=1949 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	1	1	1	28	173	357	501	488	286	60	7	1	1904
40 S	1	1	3	31	204	561	1063	1551	1837	1897	1904	1904	1904
45 M	0	0	0	5	60	209	346	333	144	10	0	0	1108
45 S	0	0	0	5	65	274	620	953	1097	1108	1108	1108	1108
50 M	0	0	0	1	16	83	192	179	40	1	0	0	512
50 S	0	0	0	1	16	99	292	471	511	512	512	512	512
55 M	0	0	0	0	4	21	65	57	5	0	0	0	151
55 S	0	0	0	0	4	24	89	146	151	151	151	151	151
60 M	0	0	0	0	0	4	16	13	0	0	0	0	34
60 S	0	0	0	0	0	5	21	34	34	34	34	34	34

Corn Growing Degree Days
50 M	0	0	0	8	54	131	211	205	86	7	0	0	702
50 S	0	0	0	8	63	194	405	610	695	702	702	702	702

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