MCNARY DAM, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(455231) MC NARY DAM
From Year=1954 To Year=2008
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	35	66	198	386	642	834	1086	1061	766	444	141	45	5704
40 S	35	101	299	685	1327	2161	3247	4308	5074	5517	5658	5704	5704
45 M	8	17	80	239	487	684	931	906	616	293	55	12	4327
45 S	8	25	105	343	830	1514	2446	3352	3967	4260	4316	4327	4327
50 M	1	3	18	113	333	534	776	751	466	159	14	2	3170
50 S	1	3	22	135	468	1002	1778	2529	2995	3154	3168	3170	3170
55 M	0	0	2	39	194	385	621	596	318	66	3	0	2225
55 S	0	0	2	42	236	621	1242	1838	2156	2222	2225	2225	2225
60 M	0	0	0	9	92	242	466	441	183	19	0	0	1454
60 S	0	0	0	9	101	343	810	1251	1434	1454	1454	1454	1454

Corn Growing Degree Days
50 M	11	28	104	213	372	517	697	688	474	243	51	14	3411
50 S	11	39	143	356	728	1245	1942	2630	3104	3347	3398	3411	3411

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