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
94.8
91
99
91
93
98
February
90.4
94
89
96
92
93
March
85.5
93
71
77
96
76
April
87.1
82
87
92
94
May
87.6
74
94
94
93
June
97.2
97
89
99
100
July
99.2
99
98
100
100
August
98.9
99
99
99
99
September
98.7
100
99
98
99
October
96.8
97
96
98
99
November
97.6
96
98
96
98
December
95.1
92
88
95
100
Average
93.9
92.7
90.9
92.7
96.0
95.8
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.