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
94.6
94
98
90
96
98
February
94.2
94
90
95
98
93
March
96.8
98
96
94
98
96
April
96.9
95
98
97
97
May
97.3
95
99
97
97
June
98.3
97
98
99
99
July
97.7
99
98
98
98
August
98.5
99
100
99
99
September
97.3
100
97
95
98
October
97.8
99
97
99
98
November
97.3
97
99
96
98
December
96.3
94
98
97
98
Average
96.9
95.6
96.6
96.9
97.4
97.4
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.