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
96.1
99
98
98
92
96
February
96.3
99
96
98
98
99
March
95.8
100
98
91
99
99
April
94.2
97
94
96
98
May
88.5
95
86
85
92
June
84.1
89
82
86
80
July
93.5
97
98
95
96
August
88.4
98
87
91
88
September
89.5
92
83
99
97
October
91.8
91
92
90
100
November
92.7
86
97
93
96
December
96.4
98
100
100
98
Average
93.2
99.4
94.6
91.7
93.5
94.8
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.