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
4.1
1
2
4
0
6
February
9.8
2
5
8
4
9
March
22.6
3
21
7
8
49
April
37.5
25
22
27
56
May
54.8
47
34
39
70
June
25.9
24
32
15
36
July
5.0
0
2
7
14
August
9.4
2
9
10
11
September
15.5
2
11
6
25
October
11.4
2
15
18
6
November
6.2
0
0
3
6
December
3.1
0
1
0
3
Average
16.1
2.1
11.1
12.9
11.9
25.0
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.