Rockford, IL: Clear/Cloudy Skies, and Daylight Hours
Average Number of Clear Days
Rockford, IL
U.S. Avg.
Difference
January
12
17
-5
February
12
16
-4
March
13
17
-4
April
12
17
-5
May
13
18
-5
June
13
19
-6
July
14
20
-6
August
16
20
-4
September
16
19
-3
October
15
19
-4
November
15
18
-3
December
13
17
-4
Average Number of Cloudy Days
Rockford, IL
U.S. Avg.
Difference
January
19
14
+5
February
16
12
+4
March
18
14
+4
April
18
13
+5
May
18
13
+5
June
17
11
+6
July
17
11
+6
August
15
11
+4
September
14
11
+3
October
16
12
+4
November
15
12
+3
December
18
14
+4
Average Daylight Hours per Day
Rockford, IL
U.S. Avg.
Difference
January
9
10
-1
February
11
11
No difference
March
12
12
No difference
April
13
13
No difference
May
15
14
+1
June
15
15
No difference
July
15
15
No difference
August
14
14
No difference
September
13
13
No difference
October
11
12
-1
November
10
10
No difference
December
9
10
-1
Rockford, IL: Rainy Days, Snow Days, and Humidity
Average Number of Rainy Days
Rockford, IL
U.S. Avg.
Difference
January
8
9
-1
February
10
8
+2
March
10
9
+1
April
10
7
+3
May
9
7
+2
June
10
7
+3
July
8
7
+1
August
10
6
+4
September
10
7
+3
October
8
7
+1
November
8
8
No difference
December
10
8
+2
Average Number of Snow Days
Rockford, IL
U.S. Avg.
Difference
January
9
2
+7
February
5
2
+3
March
2
1
+1
April
1
0
+1
May
0
0
No difference
June
0
0
No difference
July
0
0
No difference
August
0
0
No difference
September
0
0
No difference
October
0
0
No difference
November
1
1
No difference
December
9
2
+7
Average Humidity (%)
Rockford, IL
U.S. Avg.
Difference
January
73
68
+5%
February
70
66
+4%
March
68
63
+5%
April
65
59
+6%
May
67
61
+6%
June
69
60
+9%
July
71
61
+10%
August
72
62
+10%
September
71
63
+8%
October
69
63
+6%
November
71
65
+6%
December
73
68
+5%
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