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
99.2
99
100
98
99
100
February
98.4
99
99
100
99
96
March
98.3
98
100
99
100
98
April
98.1
100
100
97
99
May
98.5
100
99
99
98
June
99.3
100
99
100
99
July
99.2
100
99
98
100
August
99.4
100
99
99
99
September
98.9
100
98
97
99
October
98.2
99
97
98
99
November
98.5
100
99
99
97
December
97.6
96
97
95
100
Average
98.7
98.8
99.4
98.8
98.3
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.