MELLETTE 4 W, SOUTH DAKOTA

Period of Record General Climate Summary - Heating Degree Days

Station:(395456) MELLETTE
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	1656	1371	1092	596	277	72	12	28	196	540	1022	1479	8340
60	1501	1230	938	454	165	26	2	7	109	396	872	1324	7022
57	1408	1145	845	374	113	12	0	2	71	316	782	1231	6299
55	1346	1088	784	323	84	7	0	1	51	267	722	1169	5843
50	1191	947	633	209	36	1	0	0	20	164	574	1014	4789

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