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
58.4
75
74
58
43
64
February
73.7
76
68
77
68
79
March
86.8
85
88
93
82
89
April
95.9
96
99
95
100
May
99.0
99
100
100
98
June
99.5
98
100
99
100
July
99.3
100
98
100
100
August
99.9
100
100
100
100
September
98.3
100
99
100
99
October
92.9
98
97
95
95
November
73.9
75
71
87
75
December
52.3
58
72
48
53
Average
86.8
79.1
90.1
91.4
87.7
90.0
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.