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
51.3
56
56
66
31
61
February
69.1
73
78
89
58
74
March
82.8
73
74
95
86
88
April
87.4
79
79
88
95
May
92.8
99
92
91
92
June
94.9
93
96
98
91
July
91.3
97
89
87
92
August
88.5
82
92
81
93
September
82.3
91
62
84
86
October
71.9
68
73
94
56
November
51.1
63
30
69
55
December
49.1
51
43
50
52
Average
77.1
67.9
79.7
77.1
78.8
80.1
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.