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
78.1
78
59
74
82
85
February
81.5
72
65
71
72
96
March
78.5
68
60
61
64
90
April
71.8
47
57
66
59
May
72.8
52
53
61
59
June
70.4
51
48
61
54
July
68.6
52
47
62
56
August
68.0
60
51
59
59
September
75.5
60
54
64
65
October
76.6
63
55
63
70
November
78.1
78
55
64
77
December
77.1
76
52
78
68
Average
75.1
72.0
58.9
55.7
65.4
68.2
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.