Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
92.8
88
98
100
97
76
February
96.8
88
99
97
99
98
March
92.6
44
100
100
100
94
April
98.6
99
100
99
96
May
98.7
100
98
100
100
June
98.8
100
100
100
100
July
99.5
99
100
100
100
August
98.5
97
98
100
100
September
98.5
94
98
99
100
October
99.0
99
98
100
98
November
98.8
98
100
97
100
December
98.7
98
100
100
100
Average
94.8
71.0
98.5
99.0
99.2
96.8
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.