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
32.4
16
26
36
February
53.5
37
52
60
100
March
45.8
30
36
59
April
59.3
38
56
66
100
May
68.9
60
69
June
71.7
60
74
July
68.1
54
76
August
60.9
46
73
0
September
52.5
36
63
October
58.9
55
62
40
November
24.3
16
28
0
December
28.3
33
21
0
Average
61.0
29.9
44.6
59.6
100.0
42.8
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.