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
95.4
96
98
97
96
94
February
97.6
98
98
97
98
95
March
98.0
99
100
98
97
96
April
91.6
78
99
96
58
May
98.2
97
99
99
98
June
98.9
100
99
100
97
July
98.6
100
100
100
99
August
98.5
99
99
97
99
September
98.7
100
99
100
98
October
97.3
97
97
99
98
November
95.1
95
98
96
91
December
95.3
93
99
98
96
Average
97.0
97.5
96.2
98.4
98.0
95.2
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.