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
64.5
79
71
60
46
66
February
75.3
73
78
86
72
76
March
86.0
92
77
94
82
88
April
92.2
97
83
92
97
May
96.1
97
98
94
96
June
96.5
97
99
94
93
July
96.2
98
99
97
97
August
97.1
98
98
96
97
September
93.6
97
88
87
100
October
86.3
77
85
96
91
November
66.8
73
54
76
63
December
55.5
64
55
60
71
Average
86.8
82.4
88.5
88.0
86.1
89.1
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.