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
95.2
97
98
92
96
99
February
94.7
94
88
92
100
93
March
97.4
99
92
100
97
100
April
97.2
100
97
93
100
May
99.5
100
99
100
99
June
99.6
100
99
100
99
July
99.3
98
100
99
100
August
98.8
97
98
100
98
September
97.9
100
96
99
98
October
96.4
96
95
99
94
November
95.2
99
100
98
98
December
95.0
90
98
96
100
Average
97.7
96.6
97.3
97.8
98.1
98.0
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.