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
87.9
82
94
84
92
89
February
86.9
91
82
90
92
86
March
92.2
92
88
91
94
93
April
94.9
98
88
91
89
100
May
96.7
93
99
96
99
June
98.9
97
100
98
100
July
99.6
100
100
100
99
August
99.3
100
100
97
100
September
99.3
100
100
100
99
October
96.7
97
99
98
98
November
89.8
92
88
97
96
December
89.9
93
92
88
83
Average
94.6
91.5
94.0
95.3
95.3
96.0
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.