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
98.2
99
94
100
100
97
February
98.5
100
94
100
98
99
March
96.5
98
100
100
100
81
April
95.6
100
100
100
74
May
96.6
100
98
100
80
June
99.5
100
100
100
98
July
99.4
100
100
100
98
August
99.4
100
100
100
100
September
99.3
100
100
100
98
October
99.4
100
100
100
100
November
99.4
100
99
100
100
December
99.1
100
99
99
100
Average
98.4
98.8
99.0
99.4
99.7
93.2
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.