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
54.8
58
51
58
51
59
February
63.2
63
67
60
53
71
March
78.8
68
78
92
74
84
April
89.0
94
90
87
92
May
93.5
98
94
87
96
June
94.9
99
95
96
94
July
94.9
96
96
98
96
August
92.8
87
96
90
92
September
90.4
83
98
89
92
October
80.5
85
83
84
80
November
64.5
61
59
74
79
December
57.3
68
52
55
47
Average
82.0
63.7
85.2
87.0
82.9
86.2
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.