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
99.1
99
99
99
99
February
98.2
100
100
94
100
March
92.2
85
98
91
95
April
99.4
100
100
98
May
99.6
100
100
99
June
99.3
100
100
98
July
95.6
98
90
99
August
99.1
100
98
100
September
74.5
100
27
98
October
96.1
100
99
89
November
98.3
98
100
96
100
December
98.6
100
95
100
99
Average
96.4
94.7
99.4
91.3
97.4
99.3
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.