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
86.7
81
94
81
84
84
February
88.9
89
86
84
90
85
March
88.0
92
87
82
90
82
April
89.1
83
84
91
90
90
May
86.9
94
80
79
87
June
75.6
75
69
86
63
July
70.8
78
56
77
69
August
68.2
66
67
69
79
September
87.9
87
88
86
83
October
92.5
91
95
99
95
November
93.4
90
97
86
95
December
90.3
88
96
92
95
Average
84.4
86.3
84.3
80.5
85.0
82.8
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.