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
73.9
72
90
77
87
86
February
77.6
67
82
89
75
89
March
79.2
76
71
86
80
97
April
90.0
86
94
98
97
May
77.3
68
91
72
71
June
74.0
85
86
84
10
July
69.5
83
93
89
0
August
55.3
0
97
96
0
September
70.5
83
83
91
39
October
75.1
78
94
89
92
November
75.5
80
87
95
87
December
77.4
36
95
78
88
Average
74.0
72.1
69.6
89.6
86.1
55.6
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.