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
73.5
0
84
82
91
85
February
72.0
0
81
87
87
84
March
72.5
0
84
89
76
90
April
81.5
27
93
90
97
89
May
81.4
66
90
83
92
June
82.7
83
90
79
91
July
84.4
86
93
82
90
August
84.5
75
75
96
79
September
82.8
78
69
85
80
October
82.4
91
82
70
78
November
84.4
72
88
93
63
December
74.3
0
93
94
88
Average
74.7
9.2
77.9
85.7
85.2
85.5
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.