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
95.3
97
96
89
98
99
February
96.1
98
97
96
97
93
March
97.9
98
99
98
98
April
97.5
92
100
99
99
May
96.8
96
97
97
100
June
96.6
95
95
95
98
July
97.7
97
100
98
99
August
97.3
98
99
99
99
September
96.2
97
94
100
98
October
96.6
96
97
98
98
November
97.6
98
100
95
97
December
97.1
99
90
98
99
Average
96.9
97.3
96.6
96.2
97.4
98.0
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.