DULUTH INTL AP, MINNESOTA

Period of Record General Climate Summary - Growing Degree Days

Station:(212248) DULUTH WSO AP
From Year=1948 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	10	92	345	594	797	738	444	175	19	0	3214
40 S	0	0	10	103	447	1041	1837	2575	3020	3195	3213	3214	3214
45 M	0	0	3	43	215	444	642	583	304	91	5	0	2330
45 S	0	0	3	47	261	706	1347	1930	2234	2325	2330	2330	2330
50 M	0	0	1	17	115	299	487	429	183	39	1	0	1571
50 S	0	0	1	18	133	432	919	1347	1531	1570	1571	1571	1571
55 M	0	0	0	6	52	174	334	280	95	14	0	0	954
55 S	0	0	0	6	58	232	565	845	940	954	954	954	954
60 M	0	0	0	1	19	83	195	152	40	4	0	0	494
60 S	0	0	0	1	20	103	298	450	490	494	494	494	494

Corn Growing Degree Days
50 M	0	0	6	60	198	343	494	446	240	88	8	0	1883
50 S	0	0	6	67	265	607	1101	1546	1786	1874	1882	1883	1883

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