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
22.0
30
32
20
7
20
February
34.9
50
46
62
6
11
March
35.3
37
43
65
15
15
April
37.5
35
72
12
19
May
45.8
32
86
2
37
June
57.8
48
88
19
26
July
73.1
64
94
21
67
August
59.9
56
62
16
76
September
48.0
56
55
16
35
October
42.4
53
59
12
26
November
25.6
27
35
31
37
December
21.2
39
37
3
9
Average
33.6
39.2
45.1
66.6
11.9
27.6
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.