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
92.9
94
95
91
85
91
February
91.8
91
85
90
94
96
March
85.4
91
71
80
91
85
April
85.0
78
79
87
88
May
77.3
91
53
82
81
June
66.3
60
60
71
59
July
55.9
64
45
46
60
August
60.0
38
53
69
72
September
74.7
64
65
79
69
October
85.2
78
84
97
90
November
90.8
83
91
87
93
December
92.5
83
96
94
100
Average
80.0
91.9
72.1
69.5
80.3
80.4
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.