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
66.5
55
62
63
71
74
February
61.1
52
49
61
75
68
March
66.1
56
70
60
77
65
April
73.5
77
72
81
72
May
77.2
67
79
80
81
June
80.3
69
75
87
79
July
78.2
71
69
89
82
August
75.8
71
75
85
81
September
76.6
78
78
86
78
October
67.0
66
72
67
62
November
62.1
57
59
65
77
December
61.0
52
60
65
71
Average
68.4
54.4
65.3
68.2
76.6
73.8
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.