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
16.5
0
26
25
6
27
February
24.9
18
18
23
18
23
March
45.7
36
49
39
43
47
April
50.9
42
30
51
74
May
43.1
42
27
53
49
June
37.3
35
37
30
32
July
45.4
40
56
38
56
August
48.5
24
56
48
54
September
51.6
51
47
57
55
October
28.3
23
26
39
36
November
12.8
4
7
0
15
December
6.4
1
6
8
7
Average
34.2
19.2
30.8
33.5
33.9
40.9
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.