GRAND RAPIDS FRS LAB, MINNESOTA

Period of Record General Climate Summary - Growing Degree Days

Station:(213303) GRAND RAPIDS FORESTRY L
From Year=1915 To Year=2012
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	0	0	14	122	419	674	856	780	473	193	16	0	3548
40 S	0	0	15	137	555	1229	2085	2865	3338	3531	3547	3548	3548
45 M	0	0	5	61	282	524	701	625	333	104	4	0	2639
45 S	0	0	5	66	348	872	1573	2198	2531	2635	2639	2639	2639
50 M	0	0	1	27	167	377	546	471	210	47	1	0	1847
50 S	0	0	1	28	195	573	1118	1589	1799	1846	1847	1847	1847
55 M	0	0	0	10	85	240	392	321	116	17	0	0	1181
55 S	0	0	0	10	96	336	727	1048	1164	1181	1181	1181	1181
60 M	0	0	0	3	36	127	245	186	54	4	0	0	656
60 S	0	0	0	3	39	166	411	597	651	656	656	656	656

Corn Growing Degree Days
50 M	0	1	12	97	273	419	550	495	287	122	11	0	2268
50 S	0	1	13	110	383	802	1352	1848	2135	2257	2268	2268	2268

M = Monthly Data
S - Running sum of monthly data.
Growing Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. This is done for each day of the month and summed.
Corn Growing Degree Day units have the limitations that the maximum daily temperatures greater than 86 F are set to 86 F and minimums less than 50 F are set to 50 F.
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