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
89.1
93
89
90
88
91
February
86.6
88
85
87
83
91
March
87.0
93
81
83
81
88
April
90.4
87
90
91
88
May
92.5
87
94
95
95
June
90.8
95
88
88
87
July
98.1
100
98
100
94
August
95.1
98
92
90
98
September
93.1
97
78
98
96
October
95.4
99
95
94
96
November
91.5
91
96
89
98
December
87.3
86
88
85
87
Average
91.3
91.1
91.1
89.9
90.2
92.4
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.