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
100
99
99
98
100
February
99.2
100
100
100
97
100
March
99.4
100
100
99
99
100
April
99.5
100
99
100
100
May
99.1
100
98
99
99
June
98.6
100
99
99
97
July
99.1
99
99
99
99
August
99.2
99
99
100
99
September
96.8
99
99
99
100
October
98.1
100
99
99
96
November
99.5
100
100
100
100
December
98.7
100
99
99
99
Average
99.0
100.0
99.5
99.0
99.0
99.1
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.