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
59.1
59
36
43
42
60
February
66.8
50
48
48
58
77
March
68.6
53
51
55
72
61
April
65.4
62
28
70
24
May
75.1
50
51
70
75
June
73.3
51
64
64
70
July
57.3
53
47
60
42
August
59.7
52
51
62
62
September
63.3
53
52
64
67
October
66.1
39
53
61
November
67.9
52
62
65
December
59.0
49
48
49
26
Average
67.5
53.1
50.2
48.4
60.2
57.5
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.