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
99.5
100
100
100
100
100
February
99.5
99
100
100
100
100
March
99.5
99
99
100
100
100
April
98.1
99
98
96
98
98
May
96.9
99
92
99
98
June
96.0
97
91
96
96
July
97.4
97
95
98
99
August
96.7
97
94
97
94
September
95.1
94
92
95
95
October
94.4
93
92
97
95
November
96.0
95
94
99
90
December
99.3
99
100
100
99
Average
97.6
99.3
97.2
95.1
98.1
97.0
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.