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
99
98
98
99
99
February
97.4
96
96
99
98
100
March
98.6
99
100
100
99
99
April
99.4
100
100
100
100
May
99.3
99
100
100
100
June
99.3
99
100
100
99
July
99.7
100
100
100
100
August
99.5
100
100
100
100
September
98.9
98
99
100
100
October
97.3
100
95
100
98
November
98.2
100
98
99
97
December
98.0
100
99
96
98
Average
98.7
98.0
99.0
98.9
99.2
99.2
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.