NORTHWOOD, IOWA

Period of Record General Climate Summary - Growing Degree Days

Station:(136103) NORTHWOOD
From Year=1896 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	46	229	569	831	996	918	632	321	51	3	4598
40 S	0	2	48	277	846	1677	2673	3592	4224	4545	4595	4598	4598
45 M	0	0	21	136	420	681	841	763	485	203	21	1	3572
45 S	0	0	22	158	578	1259	2100	2863	3348	3551	3571	3572	3572
50 M	0	0	9	71	284	531	686	608	344	113	6	0	2652
50 S	0	0	9	80	364	895	1581	2189	2533	2646	2652	2652	2652
55 M	0	0	3	33	170	385	531	454	219	52	1	0	1847
55 S	0	0	3	36	206	590	1121	1575	1794	1846	1847	1847	1847
60 M	0	0	1	13	87	248	377	304	120	19	0	0	1168
60 S	0	0	1	13	100	347	725	1028	1149	1168	1168	1168	1168

Corn Growing Degree Days
50 M	0	1	31	143	340	531	664	600	386	191	31	2	2921
50 S	0	2	32	176	516	1046	1710	2311	2696	2888	2919	2921	2921

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