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
98.3
99
99
95
100
99
February
98.8
100
99
98
99
99
March
98.2
100
94
100
100
99
April
99.5
99
99
100
99
May
99.7
100
100
100
100
June
98.9
100
100
99
100
July
98.6
100
100
100
99
August
96.9
99
98
97
96
September
95.4
100
88
97
100
October
96.8
99
94
98
100
November
98.9
100
98
99
99
December
99.6
100
100
99
100
Average
98.3
99.5
99.0
97.6
98.9
99.3
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.