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
44.6
53
34
50
34
45
February
40.5
37
36
56
58
48
March
39.2
48
37
41
43
43
April
37.6
32
17
57
42
May
39.3
40
40
33
58
June
32.5
33
11
35
37
July
36.0
26
37
35
28
August
39.6
21
45
29
41
September
45.4
55
41
69
29
October
55.3
52
46
64
64
November
68.5
73
84
66
65
December
59.7
64
67
62
64
Average
44.6
45.9
41.1
42.7
48.5
46.1
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.