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
62.8
67
51
61
53
73
February
67.0
63
66
63
66
83
March
79.1
65
71
90
80
85
April
85.9
87
88
89
89
May
89.9
96
94
86
98
June
95.7
97
92
97
97
July
93.6
86
93
99
97
August
92.5
84
93
90
96
September
85.7
77
82
88
92
October
75.8
82
66
71
79
November
59.0
37
40
70
85
December
58.0
54
56
60
47
Average
81.6
64.7
80.2
83.0
83.6
89.4
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.