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
45.9
33
42
46
37
42
February
60.8
58
64
61
60
58
March
68.2
71
60
72
64
62
April
66.2
68
66
63
69
May
66.7
73
60
60
74
June
52.3
43
56
55
55
July
30.8
19
33
39
37
August
33.4
43
33
52
12
September
44.1
55
51
30
46
October
62.0
60
58
63
63
November
49.6
37
52
52
49
December
44.5
27
43
45
54
Average
52.3
54.4
49.2
52.7
51.5
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.