CASTLEWOOD, SOUTH DAKOTA

Period of Record General Climate Summary - Heating Degree Days

Station:(391519) CASTLEWOOD
From Year=1893 To Year=2011
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1670	1372	1123	632	307	85	20	39	214	562	1041	1485	8551
60	1515	1231	968	489	191	32	4	11	121	416	891	1330	7199
57	1422	1146	876	407	135	16	1	4	80	335	802	1237	6460
55	1360	1090	814	355	103	10	0	2	59	286	742	1175	5994
50	1205	949	662	236	47	2	0	0	23	178	594	1020	4916

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