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
87.8
83
93
92
84
83
February
93.4
89
99
99
87
91
March
94.3
92
94
94
98
98
April
95.6
100
96
95
89
May
97.6
100
99
99
97
June
98.0
99
99
98
98
July
98.6
99
98
99
98
August
97.6
100
93
99
96
September
97.1
95
96
97
98
October
92.8
91
92
95
91
November
89.4
88
85
98
89
December
86.3
88
78
87
86
Average
93.9
88.1
95.8
94.4
95.0
93.4
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.