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
36.8
100
53
46
100
1
February
59.9
100
100
53
100
1
March
54.0
100
100
47
99
36
April
35.8
100
31
99
31
May
54.6
100
40
100
80
June
48.7
100
46
100
69
July
40.9
100
44
100
55
August
43.5
100
38
100
98
September
47.0
100
49
100
100
October
55.6
100
50
100
99
November
51.1
100
38
100
100
December
35.7
100
29
100
100
Average
51.3
100.0
92.9
42.4
99.7
62.0
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.