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
47.7
48
28
57
50
52
February
64.9
47
55
81
74
84
March
82.1
79
79
99
83
89
April
86.2
85
76
72
86
99
May
93.1
97
91
91
92
June
94.3
97
91
96
87
July
92.0
93
89
98
96
August
92.4
89
98
90
92
September
86.8
94
71
75
96
October
74.0
63
67
91
65
November
47.6
67
36
61
52
December
40.0
38
30
54
34
Average
78.4
66.0
75.9
77.2
82.6
83.0
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.