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
98.0
100
100
99
99
98
February
98.1
100
99
98
99
96
March
96.9
100
99
97
91
98
April
97.5
98
99
96
98
96
May
96.8
100
94
100
98
June
96.9
97
97
98
99
July
93.8
94
99
95
98
August
95.9
96
99
98
99
September
99.3
100
100
99
100
October
98.7
96
100
100
100
November
99.7
100
100
99
100
December
99.5
100
100
100
99
Average
97.6
99.1
98.2
98.0
97.9
98.3
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.