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
99.3
98
100
100
100
99
February
98.8
95
100
100
100
99
March
98.3
94
98
100
99
97
April
97.4
95
99
98
94
May
96.8
94
99
95
93
June
97.6
98
99
98
95
July
97.9
97
98
100
94
August
98.0
97
100
99
99
September
99.1
100
100
100
100
October
98.6
100
98
0
98
November
98.1
98
99
96
December
98.8
100
100
100
98
Average
98.0
95.5
98.1
99.2
98.4
96.8
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.