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
98.6
99
99
99
100
93
February
98.0
98
100
99
98
98
March
98.6
99
99
98
97
98
April
99.5
99
100
100
99
May
98.6
99
99
99
98
June
98.5
98
100
100
98
July
98.6
98
99
100
96
August
99.2
100
98
100
100
September
99.7
100
98
100
100
October
98.9
100
97
100
98
November
98.5
99
97
98
100
December
97.4
99
98
100
88
Average
98.6
98.6
99.2
98.4
99.1
96.9
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.