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
71.4
78
88
72
86
31
February
57.9
67
58
50
60
56
March
66.5
74
93
31
56
75
April
83.6
89
83
95
96
79
May
93.6
95
98
90
90
June
97.2
98
98
95
99
July
97.9
99
99
98
97
August
97.7
98
99
99
97
September
99.1
99
100
100
100
October
91.3
85
88
97
94
November
85.0
86
91
91
87
December
76.0
76
90
79
90
Average
84.2
77.5
88.9
84.3
87.6
83.6
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.