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
January
0.6
1
0
1
February
4.3
0
10
3
March
16.0
21
26
0
April
27.7
45
8
May
48.1
68
26
June
40.3
59
19
July
60.7
75
44
August
44.8
49
40
September
53.7
71
36
October
65.5
61
76
45
November
68.3
77
69
59
December
30.8
48
25
19
Average
31.5
7.9
49.5
29.2
39.3
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.