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
98.0
98
99
96
100
97
February
94.8
100
96
95
91
94
March
97.0
96
97
96
96
97
April
95.6
95
98
94
98
88
May
98.7
99
99
98
99
June
98.7
99
99
100
97
July
99.3
100
99
100
99
August
99.3
99
99
100
99
September
99.1
100
99
100
99
October
96.7
96
96
99
98
November
97.6
98
99
100
94
December
97.3
99
90
99
98
Average
97.7
96.9
98.2
97.0
98.4
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.