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
97.2
97
99
93
91
100
February
98.3
98
98
100
100
98
March
98.6
96
99
98
99
100
April
97.8
97
98
97
100
May
98.2
98
98
99
100
June
97.4
97
97
97
100
July
95.7
99
93
97
99
August
95.4
99
97
94
99
September
96.7
99
97
97
100
October
98.2
99
97
98
99
November
98.4
98
99
96
98
December
98.5
98
98
99
98
Average
97.4
97.0
98.1
97.0
97.0
99.0
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.