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
98.1
95
100
97
100
96
February
97.8
99
99
100
93
98
March
97.5
95
99
98
95
98
April
96.0
97
98
99
86
May
98.2
99
99
99
98
June
98.4
99
98
99
99
July
99.0
99
100
100
99
August
98.7
98
98
100
99
September
98.8
99
100
99
100
October
99.3
100
100
99
100
November
98.3
99
98
99
98
December
97.0
99
99
97
93
Average
97.9
96.3
98.8
98.7
98.4
97.1
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.