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
94.7
91
99
92
92
97
February
94.9
96
89
93
100
91
March
96.0
99
89
98
93
99
April
95.8
97
97
95
94
May
93.3
93
96
93
94
June
90.2
90
83
92
92
July
92.2
93
89
88
99
August
93.2
88
91
96
92
September
96.1
97
96
91
94
October
97.5
98
96
95
96
November
97.8
100
100
95
99
December
96.1
97
95
90
100
Average
94.4
96.5
93.2
92.8
93.0
94.9
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.