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
96.0
90
97
99
95
90
February
98.4
99
96
100
100
93
March
98.3
99
99
98
97
97
April
98.9
100
97
100
99
May
98.0
98
97
98
97
June
97.6
96
98
98
97
July
98.3
98
96
100
97
August
98.6
94
98
100
100
September
99.4
100
98
99
100
October
98.3
97
97
99
97
November
98.3
98
98
97
98
December
96.5
88
100
99
98
Average
97.8
96.0
96.5
97.8
98.2
96.8
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.