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
32.6
34
33
24
23
38
February
50.6
45
65
49
44
51
March
54.9
59
50
59
52
50
April
61.7
61
63
50
64
May
58.2
67
56
44
53
June
35.6
56
36
24
24
July
15.0
36
15
11
7
August
13.6
7
18
15
13
September
19.4
5
29
24
16
October
36.6
46
52
30
27
November
19.9
19
30
8
29
December
15.1
22
23
11
23
Average
35.9
46.6
39.2
37.9
27.8
32.4
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.