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
46.4
63
35
43
43
55
February
64.6
56
66
77
70
52
March
79.4
88
76
90
79
63
April
86.7
86
90
80
77
May
95.4
99
95
95
97
June
96.1
98
96
97
94
July
88.6
89
93
96
79
August
88.3
92
96
86
82
September
77.1
86
61
73
82
October
67.0
71
64
76
65
November
42.4
46
39
48
48
December
42.6
47
48
52
38
Average
77.1
71.6
80.6
80.7
79.9
71.4
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.