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
97.9
98
93
98
99
99
February
98.2
98
98
97
99
98
March
98.7
100
98
99
99
100
April
99.3
98
100
99
100
May
96.4
93
96
97
96
June
95.8
89
99
94
98
July
97.6
97
98
99
97
August
97.7
96
97
96
99
September
98.6
98
100
99
99
October
97.6
96
96
100
99
November
98.6
99
97
99
99
December
98.9
97
98
100
100
Average
98.0
98.4
96.0
97.7
98.2
98.6
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.