WATERTOWN RGNL AP, SOUTH DAKOTA

Period of Record General Climate Summary - Heating Degree Days

Station:(398932) WATERTOWN FAA AP
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	1681	1408	1141	645	314	88	19	40	222	570	1041	1497	8665
60	1526	1266	986	501	195	34	3	11	125	424	891	1342	7304
57	1433	1182	893	418	138	17	1	4	82	342	801	1249	6559
55	1371	1125	832	365	105	10	0	2	60	291	741	1187	6090
50	1216	984	680	245	48	2	0	0	24	182	593	1032	5006

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