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
7.7
0
36
2
4
9
February
16.3
5
37
5
7
17
March
26.9
13
59
12
41
14
April
28.5
63
15
57
10
May
26.5
69
5
39
8
June
40.8
78
20
68
27
July
33.6
78
32
28
37
August
39.4
78
34
58
45
September
37.8
75
79
21
28
October
29.5
61
58
20
36
November
8.3
8
29
0
8
December
4.3
0
22
2
4
Average
24.0
6.0
56.1
26.1
30.8
21.1
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.