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
97.1
94
98
98
94
99
February
98.3
98
95
97
100
100
March
96.6
96
93
95
98
98
April
96.8
95
96
97
98
May
98.2
98
98
98
99
June
97.7
96
96
99
98
July
98.3
98
96
98
99
August
98.0
98
96
98
99
September
95.7
96
97
98
99
October
97.0
95
95
98
99
November
96.7
96
95
97
98
December
96.2
92
94
99
97
Average
97.1
95.6
95.8
96.0
97.7
98.5
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.