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
6.2
2
19
0
0
23
February
18.8
47
41
2
14
23
March
49.0
88
79
46
50
47
April
59.1
92
85
56
45
May
49.9
99
49
45
50
June
59.2
96
83
58
63
July
57.5
99
84
7
60
August
53.4
98
78
0
22
September
61.9
84
67
84
October
39.8
53
28
70
November
10.4
9
0
1
25
December
1.9
1
0
0
7
Average
40.3
42.0
70.1
51.0
28.5
44.7
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.