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
98.3
100
98
97
99
99
February
99.1
100
98
98
99
100
March
98.9
100
99
98
100
100
April
98.0
100
93
98
99
May
97.9
100
98
93
99
June
97.6
100
97
98
98
July
96.3
100
97
99
90
August
93.8
100
87
96
94
September
94.0
100
96
86
94
October
95.1
99
98
90
95
November
98.9
100
98
100
98
December
98.6
100
99
98
100
Average
97.5
99.9
99.3
96.0
96.0
97.2
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.