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
98.1
99
94
99
100
98
February
98.4
98
99
99
98
98
March
98.3
97
97
98
99
99
April
96.7
96
98
97
94
May
96.2
97
96
97
97
June
94.6
94
94
97
93
July
98.5
97
99
97
99
August
97.3
98
97
97
97
September
96.6
99
94
98
96
October
95.3
97
96
97
97
November
98.7
98
99
99
99
December
98.5
97
97
99
99
Average
97.4
98.1
96.9
97.0
97.8
97.0
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.