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Table 42ab

 
Chances of Measurable Precipitation (%) on
Any Given Day of the Year
Based on 1928-2002 Period of Record
Day
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1
25.3
26.7
26.7
34.7
28.0
33.3
8.0
17.3
13.3
17.3
24.0
33.3
2
32.0
32.0
50.7
40.0
22.7
28.0
6.7
16.0
17.3
21.3
22.7
26.7
3
32.0
20.0
38.7
24.0
22.7
24.0
9.3
13.3
14.7
18.7
24.0
25.3
4
33.3
25.3
28.0
24.0
26.7
28.0
10.7
24.0
16.0
21.3
21.3
33.3
5
38.7
25.3
36.0
25.3
26.7
25.3
6.7
17.3
20.0
13.3
21.3
24.0
6
25.3
30.7
24.0
29.3
32.0
25.3
10.7
18.7
18.7
13.3
21.3
24.0
7
25.3
28.0
20.0
32.0
30.7
30.7
13.3
9.3
14.7
24.0
32.0
32.0
8
28.0
37.3
22.7
29.3
38.7
26.7
14.7
16.0
16.0
18.7
28.0
20.0
9
22.7
29.3
24.0
37.3
25.3
32.0
14.7
17.3
12.0
22.7
20.0
26.7
10
36.0
29.3
24.0
32.0
33.3
21.3
18.7
10.7
20.0
21.3
26.7
28.0
11
41.3
30.7
40.0
29.3
26.7
12.0
16.0
17.3
18.7
14.7
30.7
26.7
12
30.7
38.7
26.7
24.0
29.3
24.0
14.7
22.7
20.0
25.3
29.3
26.7
13
36.0
33.3
40.0
21.3
21.3
18.7
8.0
16.0
17.3
26.7
30.7
28.0
14
32.5
38.7
40.0
30.7
21.3
14.7
10.7
25.3
14.7
20.0
29.3
16.0
15
38.7
29.3
28.0
21.3
33.3
14.7
16.0
25.3
9.3
24.0
26.7
24.0
16
37.3
36.0
25.3
21.3
32.0
20.0
14.7
21.3
12.0
24.0
22.7
25.3
17
32.0
40.0
38.7
32.0
24.0
17.3
17.3
20.0
17.3
14.7
40.3
32.0
18
36.0
44.0
24.0
36.0
21.3
14.7
13.3
22.7
22.7
18.7
34.7
24.0
19
33.3
28.0
29.3
37.3
22.7
10.7
18.7
22.7
25.3
17.3
25.3
32.0
20
30.7
28.0
21.3
32.0
24.0
10.7
12.0
17.3
26.7
17.3
29.3
22.7
21
29.3
26.7
24.0
36.0
26.7
12.0
16.0
18.7
18.7
16.0
28.0
32.0
22
34.7
36.0
28.0
34.7
26.7
10.7
14.7
14.7
16.0
14.7
28.0
32.0
23
38.7
36.0
38.7
30.7
22.7
9.3
20.0
12.0
24.0
20.0
18.7
33.3
24
34.7
28.0
42.7
32.0
29.3
16.0
17.3
17.3
18.7
17.3
29.3
25.3
25
29.3
26.7
32.0
41.3
25.3
10.7
18.7
18.7
22.7
16.0
28.0
33.3
26
25.3
29.3
25.3
36.0
25.3
14.7
14.7
18.7
12.0
17.3
25.3
28.0
27
30.7
28.0
32.0
37.3
29.3
10.7
9.5
16.0
17.3
22.7
25.3
28.0
28
38.7
22.7
26.7
40.0
21.3
2.7
14.7
20.0
13.3
30.7
25.3
37.3
29
28.0
16.7
34.7
40.0
22.7
8.0
18.7
18.7
12.0
25.3
21.3
40.0
30
30.7
 
36.0
30.7
25.3
8.0
20.0
10.7
21.3
26.7
21.3
33.3
31
33.3
 
34.7
 
29.3
 
16.0
10.7
 
29.3
 
30.7

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