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
97.6
99
94
95
100
97
February
96.6
98
99
100
97
93
March
97.4
99
100
96
98
98
April
97.9
100
99
95
100
100
May
97.7
98
96
100
100
June
98.9
99
99
100
100
July
99.7
100
100
100
99
August
99.8
100
100
100
100
September
99.6
100
100
100
99
October
97.4
98
98
99
99
November
97.3
98
95
100
99
December
97.2
96
96
98
95
Average
98.2
98.9
98.4
97.6
99.3
98.2
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.