Waterloo Weather History (IA)
Summary
Temp.
(ºF)
Relative Humidity
(Percentage)
Extreme Temp.
(Days Per Month)
Rain
(Inches)
Cloudiness
(Days Per Month)
Average
A.M.
P.M.
Below
32º
Above
90º
Average
Clear
Partly
Cloudy
Cloudy
January
14.6
78%
71%
31
0
0.8
8
7
16
February
20.1
80%
70%
27
0
1.1
7
6
15
March
34.2
82%
67%
24
0
2.3
6
7
18
April
48.3
81%
58%
11
N/A
3.3
6
8
16
May
60.2
81%
57%
1
1
4.1
7
9
14
June
69.1
84%
58%
0
4
4.5
7
11
12
July
73.1
87%
62%
0
6
4.8
9
12
11
August
70.3
90%
63%
0
4
3.6
9
11
11
September
61.9
89%
62%
1
1
3.5
10
8
12
October
50.1
83%
59%
9
N/A
2.6
10
8
14
November
35.7
83%
68%
22
0
1.8
5
7
18
December
20.3
82%
73%
30
0
1.3
7
6
18
Annual
46.5
83%
64%
155
16
33.7
91
100
174
Average Temperature (ºF)
Jan.
Feb.
Mar.
Apr.
May.
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
14.6
20.1
34.2
48.3
60.2
69.1
73.1
70.3
61.9
50.1
35.7
20.3
Relative Humidity (Percentage)
Morning
Jan.
Feb.
Mar.
Apr.
May.
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
78%
80%
82%
81%
81%
84%
87%
90%
89%
83%
83%
82%
Afternoon
71%
70%
67%
58%
57%
58%
62%
63%
62%
59%
68%
73%
Rain (Inches)
Jan.
Feb.
Mar.
Apr.
May.
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
0.8
1.1
2.3
3.3
4.1
4.5
4.8
3.6
3.5
2.6
1.8
1.3
Cloudiness (Days Per Month)
January
February
March
Clear
8 Days
7 Days
6 Days
Partly Cloudy
7 Days
6 Days
7 Days
Cloudy
16 Days
18 Days
18 Days
April
May
June
Clear
6 Days
7 Days
7 Days
Partly Cloudy
8 Days
9 Days
11 Days
Cloudy
16 Days
14 Days
12 Days
July
August
September
Clear
9 Days
9 Days
10 Days
Partly Cloudy
12 Days
11 Days
8 Days
Cloudy
11 Days
11 Days
12 Days
October
November
December
Clear
10 Days
5 Days
7 Days
Partly Cloudy
8 Days
7 Days
6 Days
Cloudy
14 Days
18 Days
18 Days
Clear
Partly Cloudy
Cloudy
Days Per Year
91
100
174
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