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
96.0
99
98
99
84
98
February
97.1
100
100
100
99
94
March
97.1
100
100
100
100
92
April
97.7
100
100
100
95
May
96.2
98
99
100
88
June
96.3
100
99
100
90
July
95.6
98
99
100
86
August
97.1
99
100
100
90
September
98.4
100
100
100
97
October
97.8
99
99
100
94
November
98.4
100
99
99
98
December
96.2
100
100
99
90
Average
97.2
99.6
99.3
99.4
98.5
92.1
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.