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
0.0
0
February
44.7
47
49
53
50
March
62.9
66
69
50
62
April
72.4
70
85
40
May
65.1
76
75
June
73.6
88
46
77
July
52.2
53
78
32
August
52.3
39
67
September
50.9
66
30
October
41.9
64
37
November
38.6
49
20
December
36.9
38
Average
43.8
44.8
62.5
55.5
55.3
42.0
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.