CHELAN, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(451350) CHELAN
From Year=1890 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	2	9	101	312	586	790	1019	1003	690	337	52	3	4904
40 S	2	11	113	424	1010	1800	2819	3822	4512	4849	4901	4904	4904
45 M	0	1	27	172	431	640	864	848	540	194	11	0	3729
45 S	0	1	28	200	631	1271	2135	2983	3523	3717	3729	3729	3729
50 M	0	0	3	71	281	490	709	693	391	85	1	0	2725
50 S	0	0	3	75	355	846	1554	2248	2639	2723	2725	2725	2725
55 M	0	0	0	19	152	342	554	538	248	27	0	0	1881
55 S	0	0	0	19	172	513	1067	1605	1854	1881	1881	1881	1881
60 M	0	0	0	3	65	204	400	384	128	5	0	0	1190
60 S	0	0	0	3	68	272	672	1057	1185	1190	1190	1190	1190

Corn Growing Degree Days
50 M	1	4	52	168	331	486	666	652	416	179	15	1	2971
50 S	1	5	57	225	556	1042	1708	2360	2776	2955	2970	2971	2971

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