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
97.0
97
95
93
97
99
February
97.6
100
100
99
93
100
March
99.1
99
100
99
98
100
April
99.2
100
100
99
98
May
98.5
97
99
100
100
June
99.7
100
100
100
99
July
99.9
100
100
100
100
August
99.2
100
96
100
100
September
99.2
100
97
100
99
October
97.0
98
89
99
99
November
97.7
98
94
99
98
December
97.9
100
98
97
97
Average
98.6
98.7
98.9
97.1
98.7
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.