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
98.2
99
98
98
98
99
February
98.7
99
99
98
99
99
March
99.0
99
98
98
100
100
April
96.8
96
96
98
95
May
96.9
97
97
98
97
June
97.4
94
98
97
99
July
98.0
98
98
96
98
August
97.6
100
98
97
98
September
95.5
98
95
96
95
October
97.5
98
96
96
97
November
98.5
99
99
99
97
December
98.6
98
100
100
99
Average
97.8
98.5
97.5
97.5
97.7
97.6
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.