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
94.4
98
94
94
92
97
February
92.4
100
99
94
98
88
March
98.0
100
99
99
99
98
April
97.3
100
98
98
96
May
98.3
97
98
99
98
June
96.5
97
98
95
99
July
96.6
98
99
99
100
August
96.5
97
98
100
99
September
96.4
99
97
99
97
October
94.0
99
95
96
97
November
93.0
96
99
90
91
December
90.3
95
95
94
87
Average
95.8
99.2
97.5
97.0
96.6
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.