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
12.6
13
28
13
4
5
February
36.1
40
58
50
30
13
March
47.2
61
50
64
40
33
April
45.7
58
65
39
53
May
39.0
57
46
32
56
June
33.1
45
57
39
56
July
21.0
17
30
31
44
August
16.7
19
20
35
14
September
27.2
39
37
11
42
October
28.0
39
25
35
25
November
8.0
1
31
3
3
December
10.0
19
39
7
4
Average
28.7
38.6
35.9
39.9
26.0
30.1
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.