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
99.1
99
100
98
100
97
February
98.5
99
99
100
92
100
March
98.2
96
100
99
97
100
April
97.0
99
99
99
100
95
May
98.3
99
97
98
99
June
98.3
99
100
100
99
July
97.3
99
99
97
100
August
97.8
99
100
99
99
September
98.2
100
99
98
96
October
99.1
98
100
100
99
November
97.5
98
99
100
95
December
98.4
99
100
100
97
Average
98.1
98.2
99.0
99.1
98.3
97.9
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.