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
48.1
50
41
27
18
46
February
35.7
34
26
15
11
19
March
34.7
41
19
10
6
60
April
48.1
42
32
16
57
88
May
51.2
55
9
25
75
June
34.2
15
5
52
74
July
49.1
30
36
45
44
August
53.1
21
40
36
72
September
57.3
63
40
59
38
October
59.1
44
58
35
72
November
72.6
68
75
59
73
December
64.0
61
71
53
47
Average
55.7
41.8
38.8
31.6
38.3
57.2
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.