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
58.4
95
99
98
45
22
February
71.8
98
98
100
75
52
March
93.0
98
98
99
92
93
April
96.2
99
97
94
96
May
98.3
100
99
96
98
June
98.8
100
100
99
100
July
97.8
100
100
98
98
August
95.3
100
100
82
99
September
98.3
100
100
99
97
October
94.0
100
97
100
97
November
78.5
100
98
99
65
December
63.0
99
98
96
35
Average
89.2
96.7
99.3
98.8
90.3
82.4
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.