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
95.2
94
98
98
96
92
February
97.3
99
98
94
99
95
March
98.6
99
100
96
99
97
April
96.3
91
100
100
89
May
99.0
98
100
99
99
June
99.3
100
99
100
99
July
98.8
98
100
99
99
August
99.0
99
100
98
99
September
99.0
99
99
99
98
October
94.9
89
95
97
97
November
93.5
93
96
93
95
December
92.9
93
97
97
91
Average
97.0
97.2
96.3
97.7
97.9
95.6
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.