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
97.1
99
99
100
91
97
February
96.3
99
97
96
93
92
March
94.0
96
91
95
95
92
April
97.8
97
97
99
98
May
97.1
99
98
97
94
June
93.1
97
95
97
90
July
93.0
94
97
97
99
August
96.1
90
100
100
93
September
99.0
100
98
99
99
October
99.1
98
99
100
99
November
96.0
96
93
94
97
December
97.7
98
100
98
100
Average
96.4
97.6
96.1
97.3
96.7
95.6
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.