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
98.5
99
99
99
94
99
February
98.6
100
99
100
99
100
March
98.7
97
99
98
99
99
April
99.1
100
98
100
100
May
98.9
100
99
99
99
June
98.6
99
99
99
100
July
98.5
97
98
99
99
August
99.1
100
99
100
98
September
93.8
99
98
99
98
October
98.3
100
99
100
96
November
99.1
100
99
99
99
December
98.0
100
96
98
99
Average
98.3
98.5
99.1
98.6
98.7
98.7
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.