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
67.6
73
55
73
71
84
February
76.0
58
75
85
80
94
March
82.1
69
73
91
87
88
April
92.0
84
88
95
95
98
May
94.8
98
96
88
95
June
95.7
97
97
94
98
July
95.8
93
96
96
97
August
93.1
83
92
96
99
September
85.7
85
96
85
76
October
82.8
85
77
88
76
November
66.2
54
70
84
75
December
59.2
44
73
66
53
Average
85.1
72.3
82.6
89.9
88.3
89.0
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.