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
61.8
76
70
56
61
52
February
61.5
43
68
68
71
77
March
58.9
59
55
64
59
69
April
60.5
57
63
63
66
May
51.5
55
54
48
54
June
49.2
49
50
50
50
July
48.1
53
55
40
42
August
57.8
64
62
60
48
September
63.3
66
69
69
64
October
69.6
54
73
75
80
November
63.3
73
71
59
60
December
46.9
40
64
45
44
Average
57.0
58.5
57.9
61.1
57.0
57.7
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.