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
72.0
86
80
71
72
60
February
80.2
72
84
87
76
91
March
87.3
88
89
90
96
April
93.4
89
96
96
96
May
94.0
92
96
93
98
June
92.6
96
97
85
90
July
93.1
94
96
87
90
August
94.6
93
96
92
94
September
89.9
95
93
87
83
October
86.6
87
89
83
86
November
75.0
81
80
67
78
December
62.4
62
60
59
56
Average
86.3
78.5
88.2
90.5
84.5
87.1
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.