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
69.7
65
71
60
77
69
February
75.8
68
88
79
70
78
March
91.6
87
99
98
99
95
April
97.0
99
100
94
99
May
98.0
100
99
97
100
June
99.1
99
100
100
99
July
99.5
99
99
100
100
August
99.8
100
100
100
100
September
98.4
98
100
97
100
October
86.1
88
90
91
84
November
75.3
92
85
70
49
December
64.0
75
53
55
40
Average
88.3
74.3
93.8
91.9
90.0
87.9
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.