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
50.3
53
85
51
67
34
February
63.6
60
63
60
75
81
March
76.8
80
81
79
70
82
April
85.1
88
97
75
94
May
88.8
89
99
85
91
June
90.5
92
100
87
82
July
90.5
98
98
87
69
August
91.2
96
90
89
94
September
86.8
84
98
94
94
October
82.1
87
87
68
82
November
75.4
85
70
86
70
December
63.1
63
83
77
54
Average
77.6
64.7
84.7
85.2
80.4
77.6
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.