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
97.8
96
100
100
99
99
February
98.8
99
100
100
100
100
March
99.0
100
100
99
99
99
April
96.4
97
100
99
98
May
96.1
94
99
100
June
96.2
99
91
97
96
July
97.8
99
99
98
98
August
96.1
97
100
98
94
September
96.9
99
95
99
98
October
95.5
97
97
98
98
November
98.4
100
97
100
95
December
98.5
100
100
100
100
Average
97.3
98.4
98.5
98.1
98.8
97.7
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.