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
87.5
82
96
93
89
71
February
74.2
98
92
94
67
3
March
91.8
97
94
91
98
91
April
87.4
99
93
96
79
May
89.0
98
93
94
69
June
75.3
93
93
92
24
July
55.1
89
92
94
1
August
54.0
72
96
81
2
September
79.5
91
95
91
80
October
89.3
87
98
98
75
November
80.6
98
99
98
74
December
77.3
98
100
100
61
Average
77.6
91.9
92.0
94.4
91.4
51.3
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.