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
97.2
99
97
100
94
99
February
98.2
98
100
99
99
98
March
97.8
97
99
98
94
100
April
97.7
98
96
100
97
May
97.4
97
99
96
100
June
97.0
99
98
97
91
July
95.1
97
94
91
96
August
96.1
99
96
91
92
September
97.3
99
100
92
98
October
97.4
96
100
98
97
November
97.4
99
98
99
95
December
95.5
93
100
91
98
Average
97.0
98.0
97.7
97.8
94.6
96.6
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.