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
42.9
42
52
31
27
20
February
36.2
13
35
19
22
38
March
30.6
24
27
25
4
37
April
35.4
20
4
5
47
May
43.8
44
17
18
52
June
31.0
28
13
22
34
July
38.2
59
39
23
19
August
28.4
17
31
10
20
September
43.8
51
33
41
15
October
33.8
19
53
29
11
November
53.1
58
82
32
43
December
44.4
66
45
38
31
Average
38.5
26.5
39.1
32.6
21.8
30.3
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.