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
97.0
96
96
98
98
98
February
96.5
97
96
97
98
98
March
97.9
98
98
98
99
97
April
97.8
98
98
99
98
May
97.8
98
98
99
97
June
97.8
99
95
99
98
July
97.7
94
99
99
99
August
97.7
94
99
98
100
September
97.7
97
98
98
100
October
96.8
98
97
99
94
November
96.5
95
97
97
98
December
97.3
96
100
98
99
Average
97.3
97.0
96.5
97.6
98.4
97.9
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.