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
91.6
96
99
95
96
88
February
97.0
100
98
100
99
89
March
88.8
100
98
99
96
99
April
87.5
98
97
100
100
May
96.4
99
92
99
97
June
97.1
97
97
99
98
July
98.7
100
98
99
97
August
98.9
98
99
100
100
September
99.1
100
98
98
99
October
98.9
99
99
99
98
November
97.2
99
97
99
100
December
95.1
94
100
100
99
Average
95.7
98.5
98.2
97.4
98.5
96.6
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.