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
80.1
79
87
66
78
76
February
91.3
88
91
95
87
95
March
95.2
92
95
96
99
99
April
97.2
98
95
99
100
May
97.4
95
99
98
99
June
98.3
100
97
98
99
July
98.9
99
99
97
100
August
97.5
91
99
100
99
September
95.4
97
92
96
96
October
91.3
94
88
89
95
November
80.6
93
81
71
74
December
76.4
78
64
71
83
Average
91.5
87.2
93.5
91.5
92.3
94.6
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.