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
4.6
4
5
9
5
2
February
22.2
33
30
50
13
6
March
30.7
30
32
75
16
15
April
35.4
51
53
20
May
36.3
46
40
19
June
25.4
26
39
3
July
35.3
44
60
27
0
August
22.1
21
39
29
21
September
23.3
28
22
50
47
October
25.7
30
44
33
17
November
16.0
16
27
17
24
December
6.4
6
8
13
9
Average
20.1
22.4
28.2
39.9
20.1
15.0
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.