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
84.5
80
79
78
86
83
February
88.8
92
76
86
97
89
March
90.6
87
91
85
93
94
April
90.6
95
90
79
98
May
96.0
93
96
98
95
June
96.9
92
98
99
98
July
97.1
96
96
98
97
August
97.7
100
96
95
99
September
93.1
90
93
94
92
October
88.8
80
87
90
87
November
92.4
94
87
95
91
December
87.8
86
74
79
88
Average
91.1
86.2
88.6
88.3
91.3
91.8
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.