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
99.6
100
100
100
0
99
February
99.3
98
99
98
100
March
98.0
99
98
98
99
April
97.0
99
98
0
99
May
96.1
98
93
97
June
94.4
95
95
98
July
95.2
97
93
100
97
August
97.6
99
97
99
September
98.2
99
96
99
October
98.5
99
98
November
98.0
99
95
99
100
December
99.4
99
99
100
Average
97.9
98.9
98.3
96.4
99.5
98.5
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.