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
55.6
100
63
95
100
2
February
56.3
98
83
95
100
0
March
45.3
96
94
99
100
1
April
36.8
100
96
100
0
May
40.3
99
98
100
0
June
53.9
100
100
100
0
July
47.3
100
99
100
0
August
31.6
100
83
100
0
September
59.8
100
79
98
87
October
45.4
94
30
100
98
November
42.6
96
18
96
100
December
43.6
100
4
87
99
Average
71.6
98.0
95.4
68.6
98.5
21.1
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.