CHIEF JOSEPH DAM, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(451400) CHIEF JOSEPH DAM
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	2	11	120	335	603	802	1037	1018	713	335	55	4	5034
40 S	2	13	133	467	1071	1872	2909	3927	4640	4975	5030	5034	5034
45 M	0	1	39	194	448	652	882	863	563	198	14	0	3855
45 S	0	1	41	235	683	1335	2217	3080	3643	3841	3855	3855	3855
50 M	0	0	8	87	298	502	727	708	414	93	3	0	2838
50 S	0	0	8	95	393	894	1621	2329	2743	2836	2838	2838	2838
55 M	0	0	1	28	167	353	572	553	272	33	1	0	1980
55 S	0	0	1	29	196	549	1121	1674	1946	1979	1980	1980	1980
60 M	0	0	0	6	75	215	418	399	151	8	0	0	1271
60 S	0	0	0	6	81	295	713	1113	1263	1271	1271	1271	1271

Corn Growing Degree Days
50 M	1	6	78	215	369	498	650	637	451	213	22	1	3140
50 S	1	7	85	300	669	1167	1816	2453	2904	3117	3138	3140	3140

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