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
5.4
0
2
15
0
February
27.1
35
25
21
March
36.3
42
24
44
0
April
51.7
55
50
35
May
38.9
44
35
14
0
June
40.3
42
38
50
July
24.2
22
27
32
0
August
25.2
10
40
32
0
September
25.4
27
24
100
22
October
31.3
31
23
44
November
11.0
10
16
7
December
4.7
3
3
8
0
Average
31.5
26.6
25.6
29.6
19.5
11.1
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.