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
98.5
100
99
95
100
96
February
97.4
99
98
99
92
100
March
98.8
95
100
99
100
98
April
98.2
99
98
99
93
May
98.9
99
99
100
100
June
99.3
100
99
100
100
July
99.8
100
100
100
100
August
99.6
100
100
100
100
September
99.6
100
100
100
98
October
99.3
99
98
100
99
November
99.3
98
100
99
100
December
99.2
100
98
100
98
Average
98.9
97.9
99.3
98.8
99.1
98.4
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.