DULUTH INTL AP, MINNESOTA

Period of Record General Climate Summary - Heating Degree Days

Station:(212248) DULUTH WSO AP
From Year=1948 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	1756	1453	1258	784	445	186	68	100	320	658	1095	1572	9696
60	1601	1312	1103	636	304	89	18	34	198	506	945	1417	8163
57	1508	1227	1010	547	228	49	6	14	136	418	855	1324	7324
55	1446	1171	948	490	182	31	2	7	102	361	796	1262	6797
50	1291	1029	794	351	90	6	0	1	40	231	647	1107	5588

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