CHIGNIK, ALASKA

Period of Record General Climate Summary - Growing Degree Days

Station:(501716) CHIGNIK
From Year=1967 To Year=1978
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	0	1	4	70	244	421	424	244	65	10	4	1487
40 S	1	1	2	6	75	319	740	1164	1408	1473	1483	1487	1487
45 M	0	0	0	0	17	114	266	269	106	12	1	0	785
45 S	0	0	0	0	17	131	397	666	771	784	785	785	785
50 M	0	0	0	0	2	37	118	121	19	1	0	0	299
50 S	0	0	0	0	2	39	157	279	298	299	299	299	299
55 M	0	0	0	0	0	6	29	25	1	0	0	0	60
55 S	0	0	0	0	0	6	35	60	60	60	60	60	60
60 M	0	0	0	0	0	0	3	3	0	0	0	0	6
60 S	0	0	0	0	0	0	3	6	6	6	6	6	6

Corn Growing Degree Days
50 M	0	0	0	1	20	87	179	175	76	10	2	1	549
50 S	0	0	0	1	20	107	286	460	537	547	549	549	549

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