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
99.5
100
100
100
100
99
February
99.4
100
98
99
100
100
March
99.1
100
99
99
99
100
April
98.1
98
95
97
100
May
93.7
94
92
98
94
June
91.5
88
86
99
92
July
87.7
87
86
95
83
August
94.1
94
83
95
99
September
97.4
96
97
96
99
October
97.1
92
96
99
99
November
99.0
98
99
100
100
December
99.6
100
100
99
100
Average
97.2
99.7
95.7
94.6
98.2
97.5
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.