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
8.0
4
5
17
6
13
February
38.5
32
23
45
64
28
March
49.4
37
23
47
65
66
April
70.0
28
78
86
76
May
69.3
45
53
80
83
June
59.3
41
48
73
69
July
56.4
36
38
75
81
August
52.1
34
43
58
67
September
49.1
18
43
53
70
October
31.2
4
23
37
39
November
16.2
12
0
10
37
December
8.0
7
0
18
4
Average
41.4
24.5
23.9
38.1
53.3
54.0
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.