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
99
95
99
99
98
February
97.1
98
99
97
96
98
March
97.9
99
98
99
97
97
April
98.6
99
99
99
99
May
97.9
100
99
100
98
June
98.3
99
99
100
99
July
98.7
99
99
99
99
August
99.2
100
100
100
100
September
98.4
100
98
99
100
October
98.8
99
99
99
99
November
98.0
97
98
99
99
December
97.7
95
100
99
97
Average
98.2
98.7
98.1
98.8
98.9
98.5
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.