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
95.6
97
99
93
94
97
February
96.1
97
98
98
97
95
March
95.5
97
88
94
100
94
April
96.0
90
93
95
99
May
95.9
95
93
95
97
June
99.1
98
99
99
100
July
97.3
97
97
99
99
August
98.9
99
100
98
99
September
98.7
100
97
97
100
October
97.8
98
96
96
100
November
98.9
99
97
100
99
December
97.9
98
98
98
99
Average
97.2
97.0
96.4
96.1
97.3
98.1
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.