ICE HARBOR DAM, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(453883) ICE HARBOR DAM
From Year=1957 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	44	71	207	383	632	827	1071	1047	759	429	138	45	5653
40 S	44	115	321	705	1336	2163	3235	4282	5040	5469	5608	5653	5653
45 M	12	21	90	237	477	677	916	892	609	281	57	14	4283
45 S	12	33	123	360	837	1514	2430	3322	3931	4212	4269	4283	4283
50 M	2	4	25	115	323	527	761	737	459	153	17	3	3128
50 S	2	6	31	147	470	997	1759	2496	2955	3108	3125	3128	3128
55 M	0	0	4	42	186	378	606	582	314	65	4	0	2181
55 S	0	0	4	46	232	609	1216	1798	2111	2177	2181	2181	2181
60 M	0	0	0	11	86	235	452	427	180	20	1	0	1412
60 S	0	0	0	11	97	332	783	1211	1391	1411	1412	1412	1412

Corn Growing Degree Days
50 M	17	38	125	228	375	512	684	670	478	259	61	16	3462
50 S	17	55	180	407	782	1294	1978	2648	3126	3384	3446	3462	3462

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