ALEXANDRIA, SOUTH DAKOTA

Period of Record General Climate Summary - Growing Degree Days

Station:(390128) ALEXANDRIA
From Year=1893 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	2	7	73	287	616	880	1088	1027	710	371	66	4	5131
40 S	2	9	82	369	985	1865	2953	3980	4690	5062	5127	5131	5131
45 M	0	1	36	181	465	730	933	872	562	246	27	1	4055
45 S	0	2	37	218	683	1413	2346	3219	3781	4027	4054	4055	4055
50 M	0	0	16	102	324	580	778	717	418	145	9	0	3089
50 S	0	0	16	117	442	1022	1800	2517	2936	3080	3089	3089	3089
55 M	0	0	6	50	202	433	623	562	286	71	2	0	2235
55 S	0	0	6	56	258	691	1314	1876	2162	2233	2235	2235	2235
60 M	0	0	2	21	108	292	469	409	173	28	0	0	1502
60 S	0	0	2	22	130	422	891	1300	1473	1502	1502	1502	1502

Corn Growing Degree Days
50 M	3	9	59	195	385	566	715	674	451	248	56	6	3368
50 S	3	13	72	267	651	1217	1932	2607	3058	3306	3363	3368	3368

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