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
96.7
99
97
95
94
98
February
97.3
99
98
98
94
97
March
92.4
97
97
98
88
83
April
93.6
98
90
99
89
May
95.9
94
95
96
98
June
97.5
95
99
100
98
July
99.3
98
100
100
100
August
99.2
99
100
99
99
September
97.4
95
99
97
99
October
98.1
98
98
100
99
November
97.9
99
98
95
99
December
95.7
100
93
93
96
Average
96.9
98.1
97.2
97.0
96.4
96.1
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.