Waterloo, Iowa
H
I S T O R I C A L
W
E A T H E R
D
A T A
Average Temperature
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
°F
46.5
14.6
20.1
34.2
48.3
60.2
69.1
73.1
70.3
61.9
50.1
35.7
20.3
°C
8
-9
-6
1
9
15
20
22
21
16
10
2
-6
Years Charted: 30
Source:
National Weather Service, San Francisco
Results based on data collected from 1961 - 1990
Average High Temperature
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
°F
56.9
23.7
29.4
43.3
59.3
71.6
80.5
83.9
81.5
73.7
61.8
45.2
28.9
°C
13
-4
-1
6
15
22
26
28
27
23
16
7
-1
Years Charted: 30
Source:
National Weather Service, San Francisco
Results based on data collected from 1961 - 1990
Average Low Temperature
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
°F
36
5.4
10.6
25
37.1
48.7
57.6
62.2
59
50
38.4
26.2
11.7
°C
2
-14
-11
-3
2
9
14
16
15
10
3
-3
-11
Years Charted: 30
Source:
National Weather Service, San Francisco
Results based on data collected from 1961 - 1990
Highest Recorded Temperature
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
°F
105
58
66
87
100
94
103
105
105
98
95
79
65
°C
40
14
18
30
37
34
39
40
40
36
35
26
18
Years Charted: 45
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Lowest Recorded Temperature
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
°F
-34
-31
-29
-34
-4
25
38
42
38
22
11
-17
-27
°C
-36
-35
-33
-36
-20
-3
3
5
3
-5
-11
-27
-32
Years Charted: 45
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Mean Number of Days Below 32°F/0°C
Total
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
Days
157
31
27
24
11
1
0
0
0
1
10
22
30
Years Charted: 34
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Average Precipitation
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
in.
33.7
0.8
1.08
2.3
3.3
4.08
4.47
4.83
3.64
3.51
2.57
1.82
1.3
mm
855
20
27
58
83
103
113
122
92
89
65
46
33
Years Charted: 30
Source:
National Weather Service, San Francisco
Results based on data collected from 1961 - 1990
Average Snowfall
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
in.
32.1
6.9
6.6
6
1.7
0
0
0
0
0
0.1
3.6
7.2
mm
815
175
167
152
43
0
0
0
0
0
2
91
182
Years Charted: 39
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Average Wind Speed
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
mph
10.7
11.5
11.4
12.4
12.7
11.1
10
8.6
8.4
9.2
10.2
11.2
11.2
km/h
17
18
18
19
20
17
16
13
13
14
16
18
18
Years Charted: 37
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Average Days of Precipitation
Total
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
Days
103
7
6
9
10
11
10
10
9
9
7
7
8
Years Charted: 43
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Mean Number of Cloudy Days
Total
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
Days
175
16
15
18
16
14
12
11
11
12
13
18
18
Years Charted: 33
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Mean Number of Partly Cloudy Days
Total
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
Days
100
7
6
7
8
10
11
12
11
8
8
7
6
Years Charted: 33
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Mean Number of Clear Days
Total
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
Days
90
8
7
6
6
7
7
8
9
10
10
5
7
Years Charted: 33
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Average Morning Relative Humidity
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
%
83
77
80
82
82
81
83
86
90
89
84
83
82
Years Charted: 34
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Average Afternoon Relative Humidity
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
%
62
70
68
65
55
55
55
59
59
59
56
66
72
Years Charted: 34
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
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