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
98.8
100
99
98
100
100
February
97.3
98
97
98
98
97
March
98.1
97
98
99
99
98
April
98.0
98
96
100
99
May
98.8
99
99
99
99
June
98.7
100
99
96
100
July
98.7
99
99
100
99
August
97.9
99
98
98
96
September
95.9
95
98
97
96
October
94.2
94
94
98
96
November
96.7
96
95
98
99
December
97.6
99
97
98
97
Average
97.6
98.0
97.6
97.5
98.2
98.0
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.