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
83.2
99
88
95
96
99
February
81.9
99
99
96
98
97
March
84.3
96
98
97
98
99
April
97.2
99
99
100
99
May
98.5
100
100
100
93
June
98.0
97
99
99
100
July
99.6
100
100
99
100
August
99.6
100
99
100
100
September
95.9
99
98
100
75
October
99.1
100
99
100
96
November
99.5
100
99
100
100
December
98.4
100
100
99
96
Average
94.3
97.9
97.9
98.3
99.0
96.1
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.