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
96.0
89
100
100
100
84
February
87.1
81
94
81
79
94
March
94.4
100
94
94
96
100
April
99.3
99
99
100
99
May
99.5
99
100
100
100
June
98.1
94
100
99
96
July
99.5
100
99
100
100
August
99.2
99
98
100
100
September
98.4
94
97
100
100
October
99.1
98
100
100
100
November
98.8
99
100
100
100
December
95.3
89
100
93
100
Average
96.4
90.1
96.5
97.3
97.2
97.7
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.