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
89.4
95
94
82
87
88
February
95.5
92
99
96
99
96
March
96.7
99
94
100
96
100
April
98.6
98
97
100
100
May
98.0
99
100
98
98
June
97.7
98
98
98
97
July
98.6
99
100
97
99
August
98.7
99
100
99
98
September
98.7
99
98
99
99
October
97.0
97
95
98
96
November
92.5
95
92
90
91
December
85.8
89
83
80
83
Average
96.1
95.3
97.0
96.3
95.8
96.1
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.