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
94.0
99
92
93
93
97
February
95.7
99
94
96
98
94
March
97.2
99
100
95
99
94
April
97.4
99
96
98
97
May
95.4
98
87
99
100
June
96.5
99
96
94
100
July
95.6
95
98
98
97
August
97.3
95
99
100
100
September
96.6
97
98
100
99
October
96.2
92
97
99
99
November
98.5
98
98
97
99
December
95.8
92
100
100
98
Average
96.7
98.6
95.8
95.8
97.8
97.9
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.