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
95.4
88
96
95
100
94
February
92.0
91
87
96
94
92
March
98.3
100
100
97
100
100
April
99.4
100
99
100
98
May
99.5
97
100
100
100
June
100.0
100
100
100
100
July
93.8
96
100
70
100
August
88.0
88
100
81
100
September
98.8
98
100
100
97
October
98.4
100
100
99
95
November
96.7
98
94
93
99
December
94.2
97
83
93
97
Average
96.0
93.1
96.4
97.7
93.8
97.8
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.