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
96.1
93
90
96
100
97
February
98.1
98
100
98
98
95
March
97.2
89
100
99
99
94
April
98.8
97
99
99
99
May
96.2
94
100
100
98
June
97.7
98
97
98
100
July
97.7
97
100
96
98
August
95.6
89
98
96
98
September
96.4
98
97
96
97
October
94.6
97
99
88
93
November
94.1
97
93
92
97
December
97.6
99
98
99
97
Average
96.4
93.4
96.3
97.7
96.5
96.7
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.