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
56.5
64
46
52
60
55
February
65.5
65
63
58
71
72
March
75.4
62
75
84
71
83
April
90.4
94
90
91
93
May
93.2
97
90
90
94
June
93.4
96
89
95
95
July
94.0
90
96
96
96
August
91.7
82
95
89
97
September
89.6
78
97
89
92
October
79.8
84
79
83
80
November
66.9
66
63
74
82
December
60.8
65
54
63
54
Average
80.7
62.9
82.2
83.9
83.1
85.8
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.