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
97.3
99
98
99
94
99
February
97.8
98
98
100
93
98
March
95.9
97
95
96
97
97
April
94.3
99
95
91
97
May
96.2
99
96
96
99
June
96.4
100
99
95
98
July
97.4
99
99
94
100
August
98.7
100
99
97
100
September
99.0
100
98
99
100
October
97.7
99
96
99
98
November
96.3
98
100
93
99
December
97.0
99
97
97
96
Average
97.1
97.7
98.7
97.7
95.4
98.3
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.