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
98.2
98
98
98
99
99
February
98.4
99
98
98
100
96
March
97.9
99
99
95
97
100
April
98.3
97
98
98
99
May
98.4
97
98
97
100
June
97.3
93
99
96
99
July
98.0
96
97
98
100
August
97.4
99
97
98
97
September
99.2
99
98
99
99
October
99.6
100
98
100
100
November
99.7
100
100
100
100
December
99.4
99
100
100
100
Average
98.5
98.4
97.9
97.9
98.4
99.1
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.