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
65.4
86
67
52
69
56
February
74.0
63
75
80
85
83
March
82.5
79
84
89
89
89
April
90.8
94
93
94
97
May
92.1
94
96
92
95
June
93.0
96
92
95
92
July
95.0
96
96
95
96
August
92.2
91
93
89
91
September
88.7
94
89
88
89
October
82.6
70
90
92
88
November
70.1
78
80
70
71
December
62.7
53
69
59
59
Average
83.4
75.8
85.6
87.9
87.1
85.5
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.