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
98.9
99
100
99
98
100
February
98.6
99
99
99
96
97
March
98.6
100
100
99
96
99
April
98.6
99
99
97
99
May
96.9
99
97
97
96
June
96.6
99
99
99
84
July
96.0
100
98
99
80
August
95.9
97
99
98
83
September
96.9
100
99
98
86
October
94.2
98
97
92
80
November
94.4
99
95
92
80
December
97.6
99
98
96
96
Average
97.2
99.2
99.0
98.0
96.3
90.0
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.