KEYSTONE, SOUTH DAKOTA

Period of Record General Climate Summary - Heating Degree Days

Station:(394556) KEYSTONE
From Year=1990 To Year=1997
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1318	1067	977	751	446	172	92	71	280	651	1010	1244	8079
60	1163	926	822	602	304	76	24	23	167	499	860	1089	6555
57	1070	841	729	514	228	43	7	12	115	414	770	996	5738
55	1008	784	668	457	183	28	3	8	87	360	710	934	5229
50	853	643	517	321	89	9	0	3	40	238	561	779	4052

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