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
94.9
100
100
93
90
100
February
98.4
99
98
100
98
98
March
95.6
97
98
98
96
96
April
96.2
99
89
97
96
May
97.2
92
97
98
100
June
99.2
97
100
100
99
July
99.4
100
100
99
100
August
99.6
100
100
99
99
September
99.5
100
100
98
99
October
98.1
99
100
98
99
November
98.1
96
99
95
98
December
95.5
97
100
96
97
Average
97.8
98.4
97.9
97.8
97.2
98.5
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.