CHARLESTON, ILLINOIS

Period of Record General Climate Summary - Growing Degree Days

Station:(111436) CHARLESTON
From Year=1896 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	28	41	180	426	745	985	1140	1080	844	522	184	44	6219
40 S	28	69	248	675	1420	2405	3545	4625	5469	5991	6175	6219	6219
45 M	11	17	106	296	591	835	985	925	694	377	105	19	4961
45 S	11	28	133	430	1021	1855	2841	3766	4460	4838	4943	4961	4961
50 M	4	6	57	188	441	685	830	770	546	251	52	6	3835
50 S	4	9	67	254	695	1380	2210	2980	3526	3776	3829	3835	3835
55 M	1	1	27	107	302	535	675	615	401	149	22	2	2836
55 S	1	2	29	136	438	972	1648	2263	2664	2813	2834	2836	2836
60 M	0	0	10	51	182	387	520	461	268	74	7	0	1960
60 S	0	0	10	62	244	632	1152	1612	1880	1954	1960	1960	1960

Corn Growing Degree Days
50 M	14	23	106	255	470	658	775	731	550	316	99	20	4016
50 S	14	37	142	398	867	1525	2300	3031	3581	3897	3996	4016	4016

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