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Period of Record General Climate Summary - Growing Degree Days

Station:(218907) WHEATON
From Year=1914 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	0	2	31	213	552	820	1009	946	631	299	40	1	4544
40 S	0	2	33	246	798	1618	2627	3573	4204	4503	4543	4544	4544
45 M	0	0	12	123	406	670	854	791	483	187	15	0	3540
45 S	0	0	12	135	541	1211	2064	2855	3339	3525	3540	3540	3540
50 M	0	0	4	63	273	521	699	636	343	103	4	0	2646
50 S	0	0	4	67	340	861	1559	2195	2538	2642	2646	2646	2646
55 M	0	0	1	28	162	374	544	481	220	49	1	0	1860
55 S	0	0	1	29	191	565	1109	1590	1810	1859	1860	1860	1860
60 M	0	0	0	10	81	238	390	331	123	19	0	0	1193
60 S	0	0	0	10	92	330	720	1050	1173	1193	1193	1193	1193

Corn Growing Degree Days
50 M	0	2	24	142	340	521	665	614	389	189	30	1	2919
50 S	0	3	27	169	509	1031	1695	2310	2699	2888	2918	2919	2919

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