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
78.6
76
80
67
89
75
February
81.6
87
74
84
75
89
March
86.0
92
83
79
80
91
April
82.6
86
84
81
89
May
77.7
61
69
93
85
June
65.5
72
55
47
74
July
63.9
85
48
57
77
August
71.6
80
71
60
64
September
68.5
68
61
62
67
October
81.4
86
84
66
94
November
84.3
96
79
81
75
December
80.3
90
76
83
79
Average
76.4
86.4
78.4
68.6
69.9
79.2
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.