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
93.7
99
99
94
99
99
February
97.2
99
100
93
99
99
March
97.6
95
99
98
97
98
April
97.5
100
100
99
100
May
96.6
100
92
99
100
June
99.3
100
99
100
100
July
98.6
97
96
98
99
August
99.8
100
100
100
100
September
99.9
100
100
100
100
October
99.2
100
98
100
100
November
98.8
97
100
99
100
December
99.0
100
99
100
100
Average
97.9
97.4
99.2
97.2
99.0
99.4
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.