CAIRO 3 N, ILLINOIS

Period of Record General Climate Summary - Cooling Degree Days

Station:(111166) CAIRO 3 N
From Year=1948 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	5	7	52	192	429	657	783	728	490	208	43	8	3603
57	3	4	37	153	370	597	721	666	432	167	30	5	3185
60	1	2	21	104	286	507	628	573	346	113	15	2	2599
65	0	0	6	46	164	359	473	419	214	49	3	0	1734
70	0	0	1	14	73	219	320	267	108	14	0	0	1016

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