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
66.5
69
62
70
53
77
February
74.9
69
82
81
71
87
March
88.6
91
78
95
87
91
April
93.5
95
92
92
98
May
95.9
99
97
91
98
June
98.0
99
99
100
95
July
96.0
97
98
100
98
August
96.8
98
96
94
97
September
92.8
97
88
95
97
October
85.7
87
87
91
80
November
69.1
67
58
65
80
December
59.5
54
63
67
57
Average
87.7
78.5
89.2
90.0
88.1
91.2
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.