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
89.0
92
91
89
87
88
February
85.6
86
83
76
87
87
March
87.0
93
86
78
76
88
April
90.0
93
85
94
88
94
May
90.2
85
97
93
96
June
89.6
94
87
83
79
July
97.5
100
97
96
92
August
91.3
98
90
89
95
September
85.9
88
76
93
82
October
93.5
97
89
96
89
November
91.1
94
95
90
92
December
87.3
87
92
79
79
Average
89.6
90.8
90.9
88.4
87.9
87.5
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.