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
96.9
99
98
91
96
96
February
95.5
95
96
99
86
97
March
95.0
94
96
90
96
98
April
95.1
98
93
96
91
May
97.1
98
94
99
100
June
98.3
99
99
97
99
July
99.0
97
100
99
100
August
99.4
99
99
98
100
September
99.2
98
100
99
100
October
99.2
99
97
100
100
November
98.2
98
99
98
100
December
98.1
100
100
96
99
Average
97.4
95.8
98.0
96.6
96.9
98.2
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.