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
87.2
89
85
86
91
92
February
86.6
91
85
84
91
88
March
85.3
91
90
83
90
78
April
86.0
86
88
92
84
May
87.5
91
87
89
89
June
88.3
94
86
88
88
July
90.8
92
86
93
91
August
92.5
93
88
90
92
September
89.8
95
88
90
87
October
86.8
88
89
88
88
November
84.6
90
85
81
85
December
86.2
87
83
89
88
Average
87.9
90.0
89.6
86.1
89.3
87.4
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.