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
98.8
97
99
100
99
98
February
98.6
99
100
99
99
100
March
98.9
99
99
99
99
97
April
99.9
100
100
100
100
May
99.7
100
100
100
100
June
97.0
100
100
99
99
July
97.1
100
100
99
100
August
95.7
100
99
99
100
September
99.4
99
99
99
99
October
99.3
100
99
100
100
November
98.9
99
97
100
99
December
98.7
98
97
98
99
Average
98.5
98.4
99.4
99.1
99.2
99.3
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.