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
2.8
0
2
11
2
3
February
5.8
6
6
8
11
5
March
12.1
3
10
8
12
31
April
30.8
31
21
45
22
May
39.3
47
36
32
42
June
32.3
19
18
38
30
July
40.5
39
42
42
21
August
45.8
18
44
47
31
September
37.9
40
30
55
21
October
29.0
13
27
43
41
November
20.4
3
10
41
25
December
6.4
0
9
17
5
Average
23.5
2.8
19.9
23.2
32.7
23.5
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.