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
94.5
89
94
88
97
92
February
93.7
92
99
92
90
93
March
95.1
92
97
99
99
88
April
96.1
94
99
98
92
May
97.8
100
98
99
94
June
99.5
100
99
100
99
July
99.7
99
100
100
100
August
99.3
98
100
100
99
September
98.6
100
99
98
97
October
97.1
98
99
97
93
November
92.2
97
92
92
94
December
95.1
97
90
94
96
Average
95.9
90.7
97.6
96.2
96.8
94.7
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.