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
99.1
99
99
100
98
100
February
98.0
91
100
100
100
97
March
96.8
95
97
97
96
97
April
93.4
86
93
93
94
99
May
94.1
90
95
91
96
June
92.9
89
95
99
89
July
93.4
92
94
94
86
August
97.3
94
99
94
99
September
97.8
98
98
100
98
October
99.2
100
100
100
99
November
98.8
100
94
99
100
December
99.5
99
100
100
100
Average
96.2
92.9
95.3
96.8
96.8
96.3
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.