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
77.5
44
47
100
100
97
February
73.6
26
62
99
99
100
March
70.1
54
44
38
99
100
April
80.8
32
95
100
100
May
79.5
40
93
95
98
June
77.9
40
100
97
96
July
81.3
58
40
98
98
August
70.8
45
27
97
100
September
81.4
35
80
96
99
October
87.8
42
98
96
100
November
83.8
95
44
100
99
December
84.4
95
28
99
98
Average
79.6
39.0
48.1
60.4
97.9
98.6
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.