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
56.8
68
66
52
43
59
February
70.3
75
74
80
67
69
March
82.7
87
72
93
80
83
April
90.0
96
79
89
97
May
94.7
97
97
93
94
June
95.3
94
98
92
93
July
93.4
95
99
97
90
August
95.9
96
98
95
94
September
89.7
96
81
82
97
October
80.1
64
79
89
89
November
58.0
62
50
67
55
December
47.2
55
48
54
56
Average
83.0
77.8
84.3
85.0
82.9
85.2
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.