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
35.0
3
11
February
57.2
62
58
40
March
82.4
83
88
100
73
0
April
70.9
83
100
80
May
66.0
73
47
0
100
June
59.6
69
44
63
July
43.2
46
22
49
August
35.3
12
0
50
September
35.4
42
35
October
59.2
63
68
November
44.8
43
0
38
December
41.6
29
Average
55.8
49.7
53.5
52.2
60.9
51.3
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.