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
96.0
98
93
96
97
95
February
97.0
97
98
97
97
96
March
96.5
98
100
95
94
95
April
97.0
99
98
97
96
May
97.2
96
98
99
98
June
96.9
96
95
98
98
July
98.5
99
98
99
99
August
98.4
100
99
98
99
September
99.1
100
99
100
100
October
97.2
88
99
99
99
November
93.1
67
98
99
99
December
97.6
100
97
98
98
Average
97.1
97.8
94.5
97.5
97.8
97.7
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.