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
98.0
96
96
100
98
98
February
96.3
89
100
98
94
97
March
97.7
100
96
96
94
98
April
97.9
98
95
97
May
96.5
92
96
99
100
June
96.5
95
99
94
100
July
99.3
100
100
100
100
August
99.3
100
99
100
100
September
95.2
99
82
99
80
October
97.7
99
94
98
96
November
96.1
99
98
93
97
December
96.8
98
93
98
98
Average
96.9
94.9
97.6
95.9
97.0
96.3
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.