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
99
99
100
99
February
98.8
99
100
100
97
100
March
98.9
97
100
99
99
100
April
98.8
98
99
98
99
May
98.6
98
100
99
99
June
98.4
99
96
99
99
July
97.5
99
98
97
96
August
98.1
100
99
97
99
September
98.4
98
99
98
99
October
97.5
100
98
99
97
November
97.4
97
99
97
96
December
97.8
97
99
98
99
Average
98.1
98.1
98.7
98.6
98.1
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.