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
98
100
96
99
February
99.0
100
97
99
100
100
March
99.4
100
100
98
99
100
April
99.1
99
98
100
99
May
98.4
99
99
98
98
June
98.1
99
99
99
99
July
97.3
94
95
98
98
August
98.4
99
99
99
99
September
96.6
98
96
98
98
October
97.6
99
98
99
95
November
97.4
95
98
98
98
December
98.8
100
96
100
99
Average
98.4
99.5
97.9
97.8
98.5
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.