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
84.9
96
98
98
96
98
February
84.8
99
98
100
97
97
March
85.8
99
98
93
98
96
April
97.4
100
97
96
97
May
98.8
98
100
100
97
June
98.9
100
99
99
99
July
99.1
100
100
100
99
August
98.7
99
99
99
99
September
98.7
99
98
98
98
October
99.0
99
100
100
98
November
97.9
98
98
98
99
December
97.6
98
97
96
99
Average
95.3
98.3
98.6
98.2
97.9
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.