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
98.3
100
100
96
97
99
February
98.6
100
100
99
98
96
March
96.4
98
99
90
95
97
April
98.0
100
95
100
99
May
98.9
100
97
99
99
June
99.4
100
99
100
98
July
99.4
100
100
99
100
August
99.7
100
100
100
100
September
99.4
98
100
100
100
October
99.7
100
100
100
100
November
98.8
97
99
100
96
December
98.5
100
97
96
100
Average
98.8
99.2
99.4
97.5
98.7
98.6
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.