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
77.0
88
74
84
78
80
February
82.8
95
94
85
67
92
March
82.5
77
86
84
86
78
April
91.8
96
93
89
89
May
97.0
99
96
95
99
June
97.6
100
98
98
99
July
99.1
99
100
98
100
August
99.4
99
100
99
99
September
98.8
99
100
100
100
October
90.6
98
100
77
93
November
68.2
90
70
62
84
December
67.5
82
67
78
37
Average
87.6
86.3
93.5
91.7
87.3
89.3
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.