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
83.7
78
87
80
94
83
February
82.0
78
82
89
93
81
March
80.8
87
88
81
82
70
April
80.5
70
83
84
83
92
May
82.5
94
62
75
88
June
80.2
91
78
87
88
July
97.0
97
98
100
99
August
97.7
99
99
91
99
September
97.9
96
99
100
94
October
97.9
97
98
97
97
November
92.6
96
84
92
95
December
93.5
93
94
97
97
Average
87.6
78.3
91.9
86.9
90.8
90.2
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.