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
93.2
98
79
92
98
98
February
92.8
93
87
94
94
96
March
88.2
87
79
89
93
92
April
78.9
80
80
79
86
May
68.5
74
75
59
59
June
66.3
70
51
63
84
July
66.7
63
73
54
69
August
75.6
80
65
82
79
September
83.1
80
80
75
87
October
89.7
91
91
100
94
November
91.3
93
93
93
December
94.1
96
92
95
Average
84.2
92.8
81.9
81.9
79.5
87.0
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.