CHARLESTON, ILLINOIS

Period of Record General Climate Summary - Cooling Degree Days

Station:(111436) CHARLESTON
From Year=1896 To Year=2012
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	1	1	27	107	302	535	675	615	401	149	22	2	2836
57	1	1	19	81	251	475	613	553	346	115	14	1	2471
60	0	0	10	51	182	387	520	461	268	74	7	0	1960
65	0	0	3	18	93	249	366	309	156	28	1	0	1223
70	0	0	0	4	35	132	220	172	74	7	0	0	644

Cooling 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.
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