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
68.8
71
72
63
0
February
64.5
68
61
65
March
57.8
67
59
55
49
April
48.5
50
42
53
May
43.9
46
38
47
0
June
44.2
48
32
52
July
42.9
42
35
51
August
49.7
54
40
55
September
56.0
66
40
61
October
66.3
75
52
70
November
75.0
73
64
88
December
77.3
79
83
73
Average
59.6
68.5
58.3
47.3
58.0
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.