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
71.1
56
58
72
78
74
February
71.8
53
63
69
79
72
March
78.2
80
79
75
82
63
April
83.0
73
66
95
81
May
88.0
70
77
97
99
June
95.5
82
97
99
98
July
97.1
95
98
100
99
August
94.0
81
98
100
99
September
90.8
93
92
95
87
October
80.0
77
74
84
80
November
77.8
76
67
81
75
December
74.3
64
77
75
71
Average
82.2
63.7
76.5
81.1
89.8
84.2
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.