MT SPOKANE SUMMIT, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(455674) MOUNT SPOKANE SUMMIT
From Year=1953 To Year=1972
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	4	18	149	290	555	544	292	73	3	0	1930
40 S	1	1	5	23	172	463	1018	1562	1855	1927	1930	1930	1930
45 M	0	0	1	6	78	172	406	398	187	30	0	0	1279
45 S	0	0	1	7	85	257	663	1061	1249	1278	1279	1279	1279
50 M	0	0	0	2	34	89	269	266	106	9	0	0	775
50 S	0	0	0	2	36	125	394	660	766	775	775	775	775
55 M	0	0	0	1	12	41	154	155	49	2	0	0	413
55 S	0	0	0	1	13	54	208	363	412	413	413	413	413
60 M	0	0	0	0	3	16	69	74	16	0	0	0	179
60 S	0	0	0	0	3	19	88	162	179	179	179	179	179

Corn Growing Degree Days
50 M	0	0	0	6	62	140	308	302	143	26	1	0	988
50 S	0	0	1	7	68	208	516	818	961	987	988	988	988

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