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
98.3
99
99
95
99
99
February
94.9
100
100
99
68
99
March
92.7
99
98
99
54
100
April
96.0
97
100
84
99
May
98.2
100
96
99
98
June
97.0
98
92
97
98
July
97.9
98
99
98
98
August
98.2
99
98
98
98
September
98.4
98
98
98
98
October
93.1
99
100
61
99
November
97.1
98
89
99
99
December
98.2
97
99
99
99
Average
96.9
99.2
98.4
96.7
87.9
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.