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
95.3
100
94
90
96
100
February
96.8
99
99
97
97
94
March
96.8
99
100
93
98
95
April
98.5
100
98
100
96
May
97.1
99
87
100
99
June
97.6
99
97
92
100
July
97.2
98
94
100
100
August
98.5
98
97
100
100
September
97.4
97
97
100
100
October
98.8
98
99
99
100
November
99.3
100
99
98
100
December
97.7
95
100
100
100
Average
97.7
99.3
98.0
95.3
98.1
98.6
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.