DULUTH HARBOR STN, MINNESOTA

Period of Record General Climate Summary - Heating Degree Days

Station:(212246) DULUTH HARBOR STN
From Year=1933 To Year=2004
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1662	1372	1189	799	529	251	65	71	244	570	985	1449	9185
60	1507	1230	1034	649	381	137	20	19	129	417	835	1294	7652
57	1414	1146	941	560	296	85	8	6	77	329	745	1201	6807
55	1352	1089	879	500	243	58	3	3	51	273	685	1139	6277
50	1197	948	724	355	130	15	0	0	14	150	537	984	5055

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