Grinnell Weather Information

Grinnell historical weather data by month.

Chance Of Sunshine

ANNUAL CHANCE OF SUNSHINE 71.36%
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Annual chance of sunshine: 71.36%
Month
% Sunny
Clear Days
Partly Cloudy Days
Cloudy Days
January
67.74%
12
9
10
February
65.52%
10
9
10
March
61.29%
9
10
12
April
63.33%
9
10
11
May
64.52%
9
11
11
June
79.31%
12
11
6
July
83.87%
14
12
5
August
80.65%
13
12
6
September
76.67%
14
9
7
October
76.67%
15
8
7
November
68.97%
12
8
9
December
67.74%
12
9
10

Temperature

JULY HIGH 91.2° - JANUARY LOW 14.6°
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Month
Average
Max Average
Min Average
January
27.1°
39.5°
14.6°
February
32.1°
45.6°
18.6°
March
39.7°
53.9°
25.4°
April
49.6°
64.1°
35.1°
May
59.6°
73.2°
46°
June
71.2°
85.7°
56.7°
July
76.9°
91.2°
62.5°
August
74.7°
88.8°
60.5°
September
65.2°
79.7°
50.6°
October
52.8°
67.7°
37.9°
November
38°
50.8°
25.2°
December
29.5°
41.8°
17.2°

Rainfall

Average Annual Rainfall 21.59 inches
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Month
Average Rainfall
January
0.35 Inches
February
0.45 Inches
March
1.34 Inches
April
1.94 Inches
May
3.86 Inches
June
3.1 Inches
July
4.04 Inches
August
2.72 Inches
September
1.45 Inches
October
1.1 Inches
November
0.91 Inches
December
0.33 Inches

Sum Of Heating & Cooling Degree Days

Potential Demand For Energy
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Month
Heating Degree Days
Cooling Degree Days
January
1175
0
February
922
0
March
786
0
April
464
2
May
201
34
June
32
218
July
1
367
August
10
310
September
95
99
October
379
1
November
811
0
December
1101
0