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
65.0
75
68
72
59
78
February
75.9
85
81
87
62
86
March
88.4
87
89
94
88
93
April
86.7
81
85
79
98
May
89.6
89
97
92
90
June
92.0
94
93
97
74
July
93.4
96
92
97
95
August
90.7
84
86
85
94
September
88.6
94
85
90
91
October
82.7
86
89
86
75
November
71.9
76
65
68
70
December
59.5
64
48
52
49
Average
84.1
82.8
85.3
85.9
82.6
84.6
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.