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
93.0
96
96
94
94
87
February
88.9
82
89
93
89
93
March
87.0
79
80
94
89
98
April
90.4
89
93
93
99
98
May
81.1
67
89
78
91
June
88.4
94
86
90
94
July
92.3
97
95
93
95
August
95.3
96
93
100
86
September
93.9
91
97
91
90
October
92.4
95
94
87
96
November
92.3
93
96
96
89
December
93.1
98
95
86
96
Average
90.2
85.5
89.8
92.7
90.8
92.8
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.