Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
0.4
0
0
1
0
0
February
18.8
53
31
26
9
13
March
37.6
72
49
34
39
45
April
39.5
67
44
59
64
May
32.3
62
48
40
55
June
23.1
53
36
23
39
July
27.2
49
38
29
31
August
30.4
64
37
23
40
September
31.8
63
25
39
36
October
21.6
60
13
33
10
November
1.1
5
0
0
2
December
1.5
8
0
0
1
Average
24.8
43.0
44.6
27.5
26.2
29.9
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.