Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km 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
86.0
89
94
85
84
78
February
92.9
93
86
99
86
96
March
96.4
94
94
98
100
99
April
98.5
100
96
98
99
100
May
98.7
100
100
99
100
June
99.1
99
99
99
99
July
99.1
98
100
99
100
August
98.5
95
100
99
99
September
96.8
97
95
97
97
October
92.6
94
91
89
95
November
80.6
92
78
77
71
December
80.1
81
78
82
78
Average
94.7
94.6
94.7
95.1
94.1
94.4
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.