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
75.7
82
81
81
75
65
February
74.7
70
83
71
80
77
March
87.6
82
90
89
88
90
April
90.8
89
90
94
92
May
92.7
99
96
84
94
June
0
0
0
0
July
95.2
94
97
97
91
August
90.8
87
87
93
95
September
83.3
88
79
93
86
October
70.5
79
74
61
55
November
66.8
63
64
68
66
December
63.5
49
64
76
43
Average
84.9
77.9
87.7
85.8
86.1
85.0
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.