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
95.0
99
99
99
93
79
February
93.9
96
95
97
94
94
March
94.1
100
87
100
95
96
April
97.8
96
96
97
100
May
99.5
100
100
100
100
June
99.3
100
100
99
100
July
99.3
100
99
99
100
August
98.8
100
99
100
98
September
98.6
98
98
99
99
October
98.6
98
99
99
99
November
99.5
100
99
100
100
December
96.5
100
100
100
99
Average
97.5
98.3
97.5
98.9
98.0
96.9
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.