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
0
0
0
0
0
February
89.4
98
72
95
97
100
March
88.0
80
86
84
91
92
April
88.0
97
86
79
84
May
0
0
0
0
June
0
0
0
0
July
0
0
0
0
August
86.4
85
84
77
85
September
94.8
88
92
96
100
October
94.9
98
88
95
100
November
0
0
0
0
December
0
0
0
0
Average
87.0
83.9
89.4
87.4
88.4
92.5
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.