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
97.9
100
97
100
100
87
February
97.7
100
99
100
84
100
March
99.5
100
99
100
99
100
April
98.4
96
97
99
99
May
96.9
96
98
97
96
June
96.2
95
98
96
97
July
97.4
98
98
95
96
August
98.0
99
98
100
95
September
99.1
100
99
98
97
October
99.0
99
96
100
99
November
99.2
99
99
97
100
December
98.5
99
100
99
100
Average
98.3
99.8
98.0
98.5
96.9
97.1
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.