ST PETER, MINNESOTA

Period of Record General Climate Summary - Growing Degree Days

Station:(217405) ST PETER 2 SW
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	0	2	52	247	582	849	1022	952	657	334	53	2	4752
40 S	0	3	54	301	883	1732	2754	3707	4363	4697	4750	4752	4752
45 M	0	0	25	150	433	699	867	797	509	215	21	1	3719
45 S	0	0	25	176	609	1308	2175	2972	3481	3697	3718	3719	3719
50 M	0	0	11	82	296	550	712	642	368	123	7	0	2791
50 S	0	0	11	93	389	939	1651	2293	2661	2784	2791	2791	2791
55 M	0	0	4	39	180	402	557	488	242	61	1	0	1975
55 S	0	0	4	44	224	626	1183	1671	1913	1973	1975	1975	1975
60 M	0	0	1	16	95	265	403	336	139	25	0	0	1280
60 S	0	0	1	17	112	377	780	1116	1255	1280	1280	1280	1280

Corn Growing Degree Days
50 M	1	2	36	158	353	545	681	628	408	208	36	2	3058
50 S	1	3	39	197	551	1096	1777	2404	2813	3020	3056	3058	3058

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