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
98.0
98
99
99
98
98
February
97.6
99
97
99
99
98
March
98.2
100
99
98
100
98
April
98.9
99
98
99
100
May
98.5
99
98
98
98
June
98.3
99
98
99
98
July
98.5
99
98
99
99
August
97.8
99
98
99
99
September
94.7
99
98
99
98
October
98.2
98
98
99
99
November
98.7
99
99
100
98
December
97.6
98
98
100
99
Average
98.0
98.9
98.8
98.2
99.1
98.5
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.