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
95.7
95
98
95
95
93
February
95.8
99
96
98
92
98
March
98.2
97
99
98
99
98
April
97.5
98
99
98
93
May
98.1
96
99
98
100
June
98.8
99
100
99
99
July
99.6
100
100
99
100
August
98.4
95
99
99
98
September
98.4
99
100
97
98
October
97.5
97
97
97
99
November
95.4
96
98
97
95
December
89.4
93
86
88
84
Average
97.2
97.0
97.3
98.1
96.9
96.8
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.