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
98.5
97
100
97
100
99
February
97.4
98
99
94
99
93
March
97.1
95
100
96
94
98
April
99.0
100
99
95
100
May
97.1
99
85
100
100
June
98.9
100
100
99
97
July
98.9
98
97
99
100
August
99.1
100
100
100
94
September
99.0
100
97
100
97
October
97.9
99
97
98
100
November
98.5
98
99
97
100
December
98.8
99
99
100
97
Average
98.2
96.6
99.2
96.6
98.3
97.8
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.