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
78.8
32
47
96
92
98
February
80.9
47
57
93
91
98
March
78.3
29
48
98
99
84
April
84.2
33
95
96
99
May
85.1
30
98
99
99
June
85.5
35
95
100
94
July
85.2
33
99
96
98
August
86.2
39
96
98
96
September
82.9
43
74
99
96
October
79.8
50
44
93
92
November
73.7
52
55
89
96
December
69.9
0
51
96
69
Average
78.0
35.6
38.4
81.4
95.8
93.6
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.