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
55.7
61
72
65
78
32
February
47.9
45
58
37
47
4
March
75.7
75
72
74
70
69
April
78.9
76
62
86
82
May
79.9
77
64
80
85
June
74.5
60
63
80
76
July
72.3
60
50
78
77
August
71.8
59
57
73
79
September
75.0
71
61
80
75
October
67.8
69
44
67
70
November
74.6
73
64
75
80
December
67.0
61
54
80
85
Average
68.4
61.1
67.1
58.2
75.8
67.8
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.