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
67.8
68
70
68
76
33
February
54.1
64
45
44
60
59
March
64.2
88
32
44
76
April
83.2
75
97
91
86
May
91.7
92
83
98
92
June
96.6
99
97
93
95
July
99.6
99
100
99
100
August
99.4
100
99
100
99
September
96.9
100
99
96
99
October
85.0
78
72
94
88
November
80.9
67
75
95
75
December
68.0
60
66
63
84
Average
80.5
65.8
81.9
77.4
84.4
82.3
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.