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
34.2
0
46
17
41
29
February
40.9
0
29
49
51
42
March
38.5
0
22
43
44
48
April
36.3
4
26
31
45
May
39.6
20
30
36
36
June
29.2
3
26
19
30
July
30.7
8
24
36
24
August
34.8
0
40
42
40
September
31.1
0
28
26
36
October
38.6
0
33
44
44
November
38.2
0
40
32
35
December
32.4
0
31
29
35
Average
39.2
10.2
31.7
35.0
36.7
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.