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
76.9
82
68
91
72
83
February
81.2
86
92
91
68
94
March
87.4
87
89
92
89
94
April
90.1
89
95
91
98
May
96.2
97
99
95
98
June
95.5
99
99
93
94
July
98.3
98
100
98
100
August
98.9
98
97
98
100
September
98.5
100
99
99
99
October
93.0
99
98
94
88
November
80.8
88
82
89
80
December
71.0
85
58
70
55
Average
89.8
85.3
92.8
94.0
89.5
91.8
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.