WHITMAN MISSION, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(459200) WHITMAN MISSION
From Year=1962 To Year=2012
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	49	65	176	317	554	747	968	932	647	331	114	48	4946
40 S	49	114	290	607	1160	1907	2875	3807	4454	4785	4898	4946	4946
45 M	16	21	73	181	399	597	813	777	498	194	47	16	3632
45 S	16	38	111	292	691	1287	2101	2878	3375	3569	3616	3632	3632
50 M	4	5	22	81	253	447	658	622	351	92	15	4	2553
50 S	4	9	31	112	364	811	1469	2092	2442	2534	2549	2553	2553
55 M	0	1	4	28	134	300	503	467	214	33	4	0	1689
55 S	0	1	6	34	168	467	971	1438	1652	1685	1689	1689	1689
60 M	0	0	0	7	57	170	350	316	105	7	1	0	1013
60 S	0	0	1	8	65	235	585	901	1005	1012	1013	1013	1013

Corn Growing Degree Days
50 M	23	38	118	209	350	463	593	576	440	246	61	22	3140
50 S	23	61	179	388	738	1201	1794	2371	2811	3057	3118	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 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