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
47.2
55
44
46
36
45
February
71.0
83
79
71
74
63
March
86.3
98
82
87
83
88
April
89.8
90
86
82
97
May
97.6
97
97
98
100
June
85.4
84
95
85
88
July
57.9
55
64
64
77
August
45.0
58
53
30
40
September
52.4
52
52
54
49
October
65.8
74
66
59
65
November
55.4
53
67
50
62
December
42.8
59
46
33
48
Average
67.3
79.9
69.2
70.2
62.3
64.4
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.