STEPHAN 2 NW, SOUTH DAKOTA

Period of Record General Climate Summary - Growing Degree Days

Station:(397992) STEPHAN
From Year=1903 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	1	5	52	215	507	795	1018	964	637	275	45	1	4514
40 S	1	6	57	272	779	1574	2592	3556	4193	4468	4513	4514	4514
45 M	0	0	22	125	361	645	863	809	492	166	16	0	3499
45 S	0	1	23	148	508	1154	2017	2825	3317	3483	3499	3499	3499
50 M	0	0	8	64	231	496	708	654	354	85	4	0	2603
50 S	0	0	8	72	303	799	1507	2160	2514	2599	2603	2603	2603
55 M	0	0	2	28	127	351	553	499	231	36	1	0	1827
55 S	0	0	2	29	156	507	1060	1560	1790	1826	1827	1827	1827
60 M	0	0	0	9	58	219	400	350	133	13	0	0	1181
60 S	0	0	0	9	67	286	686	1035	1168	1181	1181	1181	1181

Corn Growing Degree Days
50 M	3	10	55	169	327	502	652	614	408	205	51	4	3000
50 S	3	12	68	237	564	1066	1718	2332	2739	2945	2996	3000	3000

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