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
92.2
93
93
87
96
96
February
80.5
93
94
1
94
95
March
94.2
95
93
94
94
April
95.7
95
0
97
95
May
88.5
96
49
97
96
June
93.2
93
92
98
96
July
81.2
98
98
94
97
August
91.1
96
97
96
87
September
96.3
94
98
95
95
October
95.7
95
97
96
November
91.3
90
80
92
91
December
92.7
92
91
90
97
Average
90.6
93.4
94.3
75.7
95.1
94.3
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.