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
83.7
63
52
90
98
88
February
77.0
50
47
96
81
82
March
85.8
52
62
96
100
99
April
91.8
51
100
100
100
May
92.4
53
100
99
100
June
91.4
48
100
100
100
July
90.6
47
92
100
100
August
87.8
50
65
100
100
September
89.2
64
68
100
100
October
88.4
63
61
99
100
November
84.7
62
57
98
90
December
77.2
27
52
94
88
Average
84.0
54.5
52.1
80.1
97.8
96.3
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.