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
100
100
99
97
98
February
99.0
98
98
99
99
100
March
98.7
100
98
99
99
100
April
98.6
99
98
98
100
May
99.2
100
100
98
100
June
98.8
99
98
98
99
July
97.7
97
96
99
99
August
99.2
99
100
99
98
September
99.4
99
100
99
100
October
99.5
100
99
100
100
November
97.7
98
98
98
100
December
97.9
98
98
98
97
Average
98.7
99.3
98.7
98.7
98.4
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.