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
50.4
45
48
55
36
41
February
53.1
42
61
42
45
68
March
57.0
62
70
53
60
57
April
58.7
75
48
55
57
May
54.5
54
36
38
70
June
54.0
63
48
58
58
July
55.3
57
52
29
73
August
49.0
49
47
0
49
September
56.5
71
35
48
October
55.2
51
45
0
49
November
46.1
62
29
0
41
December
55.6
58
69
44
Average
52.6
48.7
59.6
46.3
47.0
51.8
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.