GRAND RAPIDS FRS LAB, MINNESOTA

Period of Record General Climate Summary - Heating Degree Days

Station:(213303) GRAND RAPIDS FORESTRY L
From Year=1915 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	1799	1485	1235	734	375	129	42	79	299	644	1112	1614	9547
60	1644	1344	1080	586	244	54	9	26	183	492	962	1459	8084
57	1551	1259	987	499	178	27	3	11	127	405	872	1366	7285
55	1489	1203	925	443	139	16	1	6	95	350	812	1304	6783
50	1334	1062	771	310	66	3	0	1	40	225	663	1149	5622

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