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
97.1
95
98
97
99
98
February
96.2
97
98
100
94
97
March
96.4
97
96
95
98
96
April
96.0
97
99
96
87
May
97.2
100
99
96
98
June
98.4
99
98
98
99
July
98.7
99
100
98
99
August
97.2
97
100
98
96
September
97.2
95
96
96
98
October
93.6
95
89
99
97
November
96.9
99
99
98
95
December
94.1
98
91
92
90
Average
96.7
96.3
97.3
97.2
96.9
95.9
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.