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
75.3
85
47
85
74
77
February
85.4
81
81
87
94
90
March
95.6
97
97
95
93
98
April
96.8
99
92
100
94
May
98.2
98
92
100
100
June
99.7
99
99
100
100
July
99.6
100
98
100
100
August
99.9
100
100
100
100
September
99.6
100
100
99
100
October
98.0
100
99
98
99
November
79.4
80
89
64
77
December
66.0
74
30
65
44
Average
91.9
87.9
90.9
91.6
91.9
91.2
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.