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
3.0
0
0
1
0
4
February
21.5
27
17
16
15
20
March
38.4
48
31
40
26
29
April
37.7
53
26
37
33
May
36.2
51
35
14
28
June
33.7
43
36
13
21
July
26.9
28
46
17
10
August
27.8
28
36
20
25
September
27.4
31
26
32
13
October
24.6
37
35
28
8
November
8.6
9
10
3
6
December
1.9
2
0
3
1
Average
25.1
26.5
28.6
27.6
17.6
16.8
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.