STEPHAN 2 NW, SOUTH DAKOTA

Period of Record General Climate Summary - Heating Degree Days

Station:(397992) STEPHAN
From Year=1903 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	1581	1288	1051	593	291	69	11	25	178	544	980	1425	8036
60	1426	1147	896	450	174	23	2	6	97	399	830	1270	6722
57	1333	1062	804	370	118	10	1	2	62	318	741	1177	5998
55	1271	1005	743	319	88	6	0	1	44	268	681	1115	5542
50	1116	864	594	206	37	1	0	0	17	162	534	960	4491

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