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
13.9
2
26
7
5
22
February
39.0
47
43
42
20
42
March
62.4
69
67
58
67
58
April
71.5
74
68
74
85
May
69.4
74
67
72
78
June
63.9
72
60
66
74
July
50.2
55
45
46
57
August
56.6
72
56
47
61
September
57.4
69
44
57
59
October
42.0
53
42
49
42
November
22.1
16
34
8
32
December
9.4
11
19
1
5
Average
46.5
40.5
54.6
47.1
44.0
52.3
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.