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
51.0
66
49
56
51
35
February
63.6
45
63
75
79
66
March
75.0
66
68
95
76
81
April
91.2
91
86
95
97
May
92.6
98
93
87
92
June
94.6
96
96
95
94
July
93.0
93
93
90
88
August
86.7
76
88
87
92
September
82.4
83
91
76
78
October
71.3
62
71
69
70
November
51.5
52
64
64
52
December
41.7
37
33
57
33
Average
77.5
59.3
77.8
84.1
80.9
78.9
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.