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
96.3
98
95
95
98
100
February
96.1
95
99
99
96
91
March
97.1
95
99
97
99
95
April
95.9
93
96
100
89
May
95.9
94
98
96
95
June
94.4
96
95
93
96
July
96.8
95
99
98
96
August
97.1
95
95
100
99
September
96.9
99
97
97
98
October
94.5
92
98
98
96
November
95.4
90
97
94
96
December
96.1
99
97
88
96
Average
96.0
95.8
95.2
96.8
96.6
95.6
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.