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
68.3
79
59
83
42
78
February
85.7
86
88
94
77
84
March
89.0
91
84
92
85
92
April
95.2
93
91
97
99
May
95.7
97
98
95
96
June
98.1
100
96
98
98
July
85.7
99
94
59
94
August
74.9
80
83
53
89
September
87.0
96
82
95
72
October
80.6
81
80
79
92
November
80.4
86
70
77
78
December
64.9
65
82
62
55
Average
86.2
86.6
88.6
88.6
78.8
88.3
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.