COLVILLE AIRPORT, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(451650) COLVILLE AIRPORT
From Year=1948 To Year=1987
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	7	48	203	458	648	862	837	538	204	20	3	3830
40 S	2	9	58	260	718	1366	2228	3066	3603	3807	3827	3830	3830
45 M	0	1	9	94	307	498	707	682	390	96	3	0	2788
45 S	0	1	11	105	411	909	1616	2299	2689	2784	2788	2788	2788
50 M	0	0	1	33	177	349	552	528	252	33	0	0	1924
50 S	0	0	1	33	210	559	1111	1639	1890	1924	1924	1924	1924
55 M	0	0	0	8	83	212	398	374	137	7	0	0	1218
55 S	0	0	0	8	91	302	701	1075	1211	1218	1218	1218	1218
60 M	0	0	0	2	28	104	252	228	57	0	0	0	671
60 S	0	0	0	2	30	134	385	614	671	671	671	671	671

Corn Growing Degree Days
50 M	0	3	35	144	289	398	534	521	353	139	6	1	2421
50 S	0	3	38	182	471	869	1402	1923	2276	2415	2420	2421	2421

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