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
93.7
89
96
89
94
92
February
86.9
83
80
91
78
94
March
81.0
77
98
74
79
82
April
85.8
100
69
88
93
May
88.9
89
93
89
79
June
91.8
90
89
96
92
July
90.5
88
96
94
92
August
87.7
91
80
90
87
September
92.5
90
88
100
94
October
95.6
98
98
94
92
November
97.9
96
97
99
99
December
96.7
96
98
96
99
Average
90.2
82.9
91.5
87.7
91.4
90.9
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.