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
71.6
87
86
80
66
50
February
85.8
95
97
98
80
96
March
95.2
96
98
100
99
93
April
96.9
95
96
96
100
May
98.4
99
99
99
100
June
98.5
100
100
100
94
July
99.4
99
100
100
99
August
99.2
100
100
99
100
September
97.1
98
96
97
95
October
96.0
100
85
98
95
November
83.5
94
77
80
63
December
75.0
85
80
61
77
Average
93.0
92.8
96.6
94.2
92.0
90.9
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.