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
99.6
100
100
99
100
100
February
99.8
100
100
99
100
100
March
99.5
100
98
99
100
100
April
97.5
99
96
96
99
May
94.0
98
93
97
93
June
94.3
94
89
96
97
July
97.4
98
97
98
97
August
94.9
96
94
95
90
September
91.9
94
91
92
92
October
90.6
89
91
93
94
November
94.2
93
92
99
83
December
99.4
99
100
100
99
Average
96.5
99.9
96.3
94.7
96.9
95.3
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.