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
63.8
77
65
76
54
82
February
72.9
67
79
85
75
81
March
77.1
63
87
78
81
80
April
91.7
89
96
93
93
May
95.5
96
90
99
98
June
99.1
98
99
99
100
July
99.0
99
97
100
100
August
98.8
100
99
99
98
September
93.0
92
98
83
93
October
86.8
96
83
71
92
November
67.5
88
69
80
78
December
52.2
59
21
66
22
Average
83.9
68.4
89.3
86.8
85.8
87.3
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.