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
98.7
100
100
99
97
99
February
98.9
99
100
99
99
98
March
98.5
99
98
100
99
99
April
98.7
98
99
99
100
May
95.2
94
98
92
97
June
90.5
90
95
95
93
July
87.9
91
85
86
92
August
93.2
94
89
87
97
September
95.7
96
96
97
94
October
98.0
98
97
99
97
November
99.3
100
99
99
100
December
98.6
100
100
99
99
Average
96.5
99.0
96.5
96.0
95.4
96.9
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.