Maximum Solar Energy (w/m²)

Report for Year 2026

Data last updated 7/18/2026 10:15 PM.

Day	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1	380	265	454	636	1169	898	1049	---	---	---	---	---
2	343	315	334	886	905	963	1174	---	---	---	---	---
3	364	408	199	350	962	939	902	---	---	---	---	---
4	290	592	287	1109	1060	1245	1007	---	---	---	---	---
5	376	587	552	1002	1011	1074	1049	---	---	---	---	---
6	102	731	837	923	1151	902	1055	---	---	---	---	---
7	394	580	410	381	1065	1079	1055	---	---	---	---	---
8	100	499	664	1097	900	1023	983	---	---	---	---	---
9	408	529	670	747	1113	1158	962	---	---	---	---	---
10	420	733	570	1037	960	1027	738	---	---	---	---	---
11	480	577	837	689	1000	983	889	---	---	---	---	---
12	446	724	489	573	1030	1039	881	---	---	---	---	---
13	295	541	842	1049	937	1067	847	---	---	---	---	---
14	422	626	791	979	900	1232	853	---	---	---	---	---
15	461	563	225	1151	870	979	1035	---	---	---	---	---
16	526	568	923	833	1039	1148	1014	---	---	---	---	---
17	410	561	596	1000	770	1288	962	---	---	---	---	---
18	299	584	796	860	835	1162	1081	---	---	---	---	---
19	461	506	721	1063	860	1005	---	---	---	---	---	---
20	452	805	722	872	905	954	---	---	---	---	---	---
21	476	766	735	879	768	541	---	---	---	---	---	---
22	622	735	545	970	798	1051	---	---	---	---	---	---
23	445	615	751	712	1027	1072	---	---	---	---	---	---
24	524	399	640	867	905	1155	---	---	---	---	---	---
25	462	724	951	914	1113	1106	---	---	---	---	---	---
26	468	737	940	1067	1013	1179	---	---	---	---	---	---
27	476	631	810	1034	918	1069	---	---	---	---	---	---
28	471	780	940	944	965	1027	---	---	---	---	---	---
29	555		796	1107	1183	1116	---	---	---	---	---	---
30	519		782	1095	951	965	---	---	---	---	---	---
31	483		830		1197		---	---		---		---
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
High	622	805	951	1151	1197	1288	1174	---	---	---	---	---
Average	417	596	666	894	977	1048	974	---	---	---	---	---
Low	100	265	199	350	768	541	738	---	---	---	---	---

Color Key
< 100	100 - 200	200 - 300	300 - 400	400 - 500	500 - 600	600 - 700	700 - 800	800 - 900	900 - 1000	1000 - 1100	1100 - 1200	1200>

© 2026, GrinnellWeather.com | Weather-Display (10.37S-(b152)) | Valid XHTML 1.0 | Valid CSS

Never base important decisions on this or any weather information obtained from the Internet.