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
86.5
86
80
77
87
98
February
85.0
73
85
88
90
98
March
88.8
81
79
92
98
84
April
89.6
80
90
92
96
May
91.6
72
92
100
95
June
95.4
94
90
98
99
July
99.4
100
99
99
99
August
99.5
99
100
100
100
September
99.8
99
100
100
100
October
96.6
97
98
96
96
November
93.1
92
99
83
98
December
86.1
80
81
91
80
Average
91.1
80.2
88.2
92.9
95.2
95.6
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.