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
49.6
59
47
32
66
31
February
59.4
53
52
37
66
52
March
74.9
77
67
77
63
79
April
73.5
69
72
71
71
May
70.8
67
82
60
76
June
45.5
38
75
47
46
July
33.3
31
29
36
29
August
39.2
30
48
16
60
September
34.6
37
39
24
28
October
51.5
56
53
50
52
November
64.7
64
75
39
64
December
65.5
54
86
40
77
Average
57.5
63.7
48.4
60.1
59.0
56.1
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.