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
56.0
50
59
45
61
50
February
65.4
57
79
71
56
69
March
84.4
69
90
87
98
87
April
91.3
93
94
87
96
May
92.5
87
93
96
100
June
98.2
96
97
100
98
July
98.8
99
100
99
99
August
99.0
98
99
100
98
September
96.1
98
96
94
99
October
75.7
80
81
83
84
November
53.6
76
58
45
37
December
49.3
62
32
34
36
Average
80.4
59.3
86.7
84.1
82.7
82.5
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.