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
90.7
95
94
95
86
92
February
89.9
94
90
93
88
86
March
92.7
99
89
92
87
97
April
94.0
95
96
90
100
May
92.8
91
94
95
100
June
86.7
91
86
85
July
95.2
94
98
94
August
94.3
100
95
83
89
September
92.3
79
94
99
90
October
93.4
67
99
99
98
November
85.6
64
98
87
86
December
90.9
97
92
91
91
Average
91.8
95.7
86.8
94.4
89.8
91.2
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.