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
97.3
92
99
100
98
February
95.6
100
98
98
99
March
97.2
99
99
98
100
April
96.5
99
94
94
99
May
99.1
100
100
99
98
June
88.9
82
90
98
94
July
89.4
77
90
97
98
August
93.2
91
97
99
96
September
92.2
88
99
97
96
October
94.4
99
99
100
98
November
95.2
96
99
99
December
93.8
98
100
99
Average
94.5
96.2
93.3
96.2
97.6
97.8
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.