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
88.2
38
100
99
96
February
91.9
56
100
98
100
95
March
90.4
66
94
99
100
97
April
97.3
94
96
99
May
99.9
99
100
100
100
June
99.4
96
100
100
100
July
98.9
92
100
100
99
August
90.7
43
93
98
98
September
87.9
32
100
93
100
October
89.6
34
100
98
98
November
86.6
19
100
98
97
December
84.7
13
99
98
Average
87.0
52.2
55.0
98.8
98.3
97.9
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.