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
91.6
94
94
93
92
93
February
90.9
90
87
77
98
92
March
93.3
97
91
97
95
92
April
95.5
95
99
94
98
May
97.2
98
96
99
99
June
97.7
99
97
97
98
July
97.7
96
98
99
98
August
96.0
93
94
98
98
September
96.6
96
98
95
96
October
95.5
98
99
94
92
November
92.9
95
96
92
94
December
85.5
77
89
88
93
Average
95.0
94.1
94.6
95.5
96.0
95.5
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.