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
95.1
99
93
96
91
97
February
97.2
98
96
97
97
98
March
97.7
100
99
98
97
100
April
98.8
99
100
99
99
May
99.2
99
99
99
99
June
98.8
100
99
99
98
July
99.1
98
100
99
100
August
99.4
100
99
99
99
September
97.1
98
99
99
99
October
98.4
100
99
95
98
November
97.7
98
99
97
97
December
96.6
96
98
94
99
Average
98.0
98.6
97.8
98.5
97.0
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.