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
98.4
100
97
99
95
98
February
96.3
98
98
99
94
98
March
94.5
98
97
100
86
95
April
96.5
96
97
97
99
May
98.5
100
98
97
98
June
98.0
98
99
97
99
July
96.2
98
99
99
99
August
95.9
96
96
100
92
September
96.9
98
99
97
96
October
98.8
99
99
99
98
November
99.4
100
100
100
100
December
99.1
100
100
99
98
Average
97.4
98.6
97.9
98.6
96.6
97.4
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.