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
99.3
99
99
99
99
February
99.6
100
100
99
100
March
99.5
100
100
99
99
April
99.1
99
100
99
100
99
May
98.2
98
100
100
June
98.2
99
98
96
July
99.1
100
99
98
August
98.1
100
98
97
September
97.8
100
97
98
October
97.2
98
95
November
97.9
100
98
98
December
99.5
100
100
100
Average
98.8
99.5
99.2
98.3
98.8
98.6
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.