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
2.0
0
1
2
1
4
February
16.2
11
19
20
17
18
March
28.9
30
11
20
25
41
April
30.0
18
11
35
45
May
26.4
23
5
22
35
June
28.8
18
6
18
28
July
31.7
15
39
29
29
August
26.9
0
23
14
42
September
27.7
7
12
31
15
October
24.7
17
15
22
18
November
3.5
0
0
1
6
December
0.8
0
1
1
1
Average
21.1
14.4
11.2
13.5
18.6
24.0
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.