KETCHIKAN, ALASKA

Period of Record General Climate Summary - Growing Degree Days

Station:(504590) KETCHIKAN
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	21	23	29	110	279	433	560	573	410	205	66	31	2740
40 S	21	44	73	183	462	895	1455	2028	2438	2643	2709	2740	2740
45 M	2	3	3	29	136	283	405	418	261	80	14	4	1640
45 S	2	6	9	38	174	457	862	1280	1541	1622	1636	1640	1640
50 M	0	0	0	6	45	141	250	264	121	15	2	0	844
50 S	0	1	1	7	52	192	443	706	827	842	844	844	844
55 M	0	0	0	1	11	47	109	118	30	1	0	0	316
55 S	0	0	0	1	12	58	167	285	315	315	316	316	316
60 M	0	0	0	0	2	12	30	33	3	0	0	0	80
60 S	0	0	0	0	2	14	44	77	80	80	80	80	80

Corn Growing Degree Days
50 M	2	3	5	37	107	184	266	277	163	46	8	2	1099
50 S	2	4	9	46	153	337	603	880	1043	1089	1097	1099	1099

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