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
43.2
9
67
55
0
February
79.1
84
86
68
0
0
March
83.5
84
77
91
0
0
April
93.4
94
93
50
0
May
92.1
96
88
100
June
87.5
92
83
100
67
July
69.4
77
62
100
0
August
83.3
85
83
100
20
September
78.7
80
78
0
67
October
82.0
78
83
88
100
November
59.4
56
75
44
0
December
49.6
48
51
51
0
Average
66.5
59.8
79.1
77.1
58.0
52.9
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.