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
0.3
0
0
0
0
0
February
3.4
7
2
6
5
0
March
13.0
26
10
11
12
3
April
18.1
28
24
9
32
May
14.5
18
2
23
27
June
6.6
15
10
8
9
July
8.3
12
15
6
13
August
14.4
23
38
18
10
September
13.1
24
29
13
11
October
6.0
13
3
16
3
November
0.2
0
0
0
0
December
0.0
0
0
0
0
Average
8.9
11.7
12.6
12.4
9.7
9.6
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.