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
6.6
2
1
7
3
8
February
19.9
17
14
29
5
16
March
33.8
42
29
18
22
40
April
52.7
42
62
39
66
May
60.1
60
48
49
70
June
50.6
38
12
35
68
July
58.5
62
49
37
69
August
57.2
28
52
38
67
September
48.4
44
29
49
52
October
37.4
23
31
26
44
November
35.1
36
30
30
28
December
18.2
18
14
20
7
Average
38.5
21.4
33.8
33.1
30.2
44.2
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.