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
94.3
92
75
100
97
97
February
98.3
99
94
97
100
100
March
97.2
86
98
99
100
99
April
99.2
96
100
100
100
May
98.5
96
97
98
100
June
99.0
97
100
99
99
July
97.7
89
100
97
100
August
99.6
99
100
100
100
September
99.3
100
99
99
93
October
98.6
98
100
100
94
November
99.8
100
99
100
100
December
98.5
99
100
98
99
Average
97.6
91.9
94.9
99.0
98.9
98.7
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.