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
48.8
75
71
26
18
66
February
53.3
77
70
34
38
51
March
49.7
59
71
36
23
39
April
50.8
56
84
44
52
20
May
55.0
75
43
33
80
June
62.1
78
73
38
59
July
61.7
84
70
30
62
August
52.1
75
48
7
69
September
55.1
71
55
37
62
October
64.7
70
63
57
58
November
58.3
78
63
57
45
December
53.0
76
55
40
26
Average
57.2
66.7
74.9
49.3
36.0
53.8
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.