ICE HARBOR DAM, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(453883) ICE HARBOR DAM
From Year=1957 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	43	74	208	389	635	833	1070	1049	758	432	136	47	5675
40 S	43	117	325	715	1350	2183	3253	4302	5060	5491	5628	5675	5675
45 M	12	22	92	243	480	683	915	894	608	283	56	14	4301
45 S	12	34	125	368	848	1531	2446	3340	3948	4232	4288	4301	4301
50 M	2	4	26	119	327	533	760	739	459	155	16	3	3142
50 S	2	6	32	151	478	1011	1771	2510	2969	3123	3140	3142	3142
55 M	0	0	4	43	189	384	605	584	313	67	4	0	2193
55 S	0	0	5	48	236	620	1225	1809	2122	2189	2193	2193	2193
60 M	0	0	0	11	87	241	450	429	181	21	1	0	1421
60 S	0	0	0	11	99	339	789	1219	1400	1421	1421	1421	1421

Corn Growing Degree Days
50 M	16	40	127	232	377	516	681	670	478	262	60	17	3474
50 S	16	56	183	414	792	1307	1988	2658	3136	3398	3458	3474	3474

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