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
98.4
100
99
100
98
95
February
98.8
99
98
99
98
100
March
98.4
98
97
98
100
99
April
98.9
100
97
98
100
May
98.4
98
99
98
99
June
95.7
96
95
96
97
July
94.9
96
90
94
100
August
96.2
98
96
95
97
September
97.9
98
95
98
99
October
98.1
96
99
99
99
November
99.0
98
99
99
100
December
98.2
98
98
99
98
Average
97.9
98.9
97.5
97.3
97.6
98.5
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.