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
94.8
96
98
95
92
97
February
96.0
96
98
97
93
97
March
92.9
94
91
100
96
92
April
94.7
96
94
96
98
May
96.2
94
96
98
93
June
98.7
100
96
97
100
July
99.2
99
100
99
98
August
99.3
99
100
100
99
September
99.6
100
100
99
100
October
98.8
99
100
99
99
November
97.6
99
94
96
96
December
96.3
93
99
96
96
Average
96.9
95.3
97.1
97.5
96.9
97.0
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.