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
99.5
100
99
100
100
100
February
99.6
100
100
100
99
99
March
99.2
100
99
98
99
100
April
98.4
99
99
98
98
99
May
97.6
99
95
97
98
June
97.3
97
97
98
95
July
97.9
99
98
98
98
August
97.1
96
98
97
99
September
97.9
99
99
98
97
October
97.9
98
98
98
99
November
95.6
96
97
95
96
December
98.6
99
100
99
98
Average
98.2
99.7
98.2
97.9
98.0
97.9
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.