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
33.8
63
58
37
7
30
February
45.5
63
64
68
11
20
March
54.1
71
73
62
28
38
April
55.3
61
76
15
32
May
52.0
52
78
49
53
June
83.3
89
90
57
58
July
92.1
97
100
58
89
August
91.9
93
95
60
71
September
78.9
91
80
42
65
October
61.2
80
86
19
45
November
34.4
63
54
16
8
December
29.9
64
47
3
5
Average
46.3
66.0
75.5
74.4
19.4
33.8
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.