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
98.5
100
95
99
100
97
February
98.8
99
100
97
98
98
March
97.3
91
100
100
94
98
April
99.1
94
100
100
100
May
99.8
100
100
100
100
June
98.5
97
97
97
100
July
99.2
96
100
99
100
August
99.4
100
100
100
99
September
99.1
99
97
100
100
October
99.1
100
99
99
96
November
99.1
100
99
100
100
December
99.0
99
100
100
96
Average
98.7
96.5
98.2
98.8
98.8
98.5
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.