CHARLESTON, ILLINOIS

Period of Record General Climate Summary - Heating Degree Days

Station:(111436) CHARLESTON
From Year=1896 To Year=2012
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1129	935	701	350	122	15	1	4	61	285	645	1019	5267
60	974	794	553	233	57	3	0	0	23	175	500	864	4179
57	882	710	468	173	33	1	0	0	12	124	418	772	3593
55	820	654	415	139	21	0	0	0	7	96	365	711	3228
50	668	518	290	70	6	0	0	0	1	42	246	560	2401

Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. 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