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
94.0
95
96
96
98
91
February
91.1
93
82
96
88
93
March
91.3
96
92
90
94
93
April
92.6
99
92
98
93
98
May
81.6
94
96
98
75
June
80.1
83
99
85
98
July
84.8
98
99
95
99
August
87.8
98
100
99
91
September
97.5
98
99
99
98
October
97.8
98
99
97
97
November
95.4
91
94
98
97
December
92.6
96
99
87
95
Average
90.8
96.0
93.1
97.0
94.3
93.4
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.