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
94.6
97
99
91
94
99
February
88.9
99
90
90
87
89
March
87.4
94
78
81
91
82
April
87.2
83
95
85
92
99
May
88.5
83
92
93
99
June
98.0
94
95
100
99
July
99.1
98
99
100
100
August
99.0
100
99
99
99
September
98.2
100
97
96
100
October
96.8
96
97
97
98
November
95.7
95
97
96
98
December
94.5
92
87
98
98
Average
93.9
92.5
93.2
92.9
95.5
96.6
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.