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
85.3
92
80
90
78
92
February
90.9
95
96
91
93
97
March
95.3
93
97
100
98
100
April
96.3
97
94
95
100
May
97.6
99
99
96
98
June
98.4
99
99
99
96
July
98.5
97
100
99
99
August
98.3
98
100
98
98
September
96.6
100
97
97
96
October
90.5
92
84
85
89
November
80.3
91
78
75
68
December
75.1
77
83
56
61
Average
93.2
93.2
94.4
94.3
90.9
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 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.