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
95.7
98
98
97
97
96
February
90.5
90
95
93
90
92
March
94.2
89
95
97
100
94
April
95.2
96
99
97
95
May
95.2
94
96
100
99
June
94.1
95
97
97
95
July
96.8
97
97
99
97
August
98.7
99
98
100
100
September
98.7
98
99
99
99
October
97.9
98
96
98
99
November
96.7
97
98
96
98
December
95.1
92
94
98
96
Average
95.4
92.3
96.1
96.7
97.4
96.3
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.