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Period of Record General Climate Summary - Heating Degree Days

Station:(131402) CHARLES CITY
From Year=1893 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	1524	1256	1001	519	205	36	7	18	149	448	905	1359	7426
60	1369	1115	847	382	110	9	0	3	71	311	755	1204	6177
57	1276	1030	755	305	68	3	0	1	42	238	666	1111	5496
55	1214	974	695	257	47	2	0	0	28	194	607	1049	5068
50	1059	833	547	155	16	0	0	0	8	106	465	894	4083

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