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
99.1
98
99
100
100
98
February
98.5
96
100
100
97
98
March
99.1
100
99
99
100
99
April
99.2
99
100
99
100
May
97.3
98
99
98
99
June
98.1
99
99
98
97
July
98.5
99
99
100
98
August
97.6
92
100
99
99
September
97.8
97
99
96
96
October
94.7
91
99
91
93
November
92.8
100
85
91
94
December
96.4
99
89
97
97
Average
97.5
97.8
97.7
97.3
97.1
97.4
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.