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
63.7
53
80
72
83
67
February
80.0
82
74
84
85
82
March
68.4
70
80
76
59
71
April
76.9
72
88
76
77
May
82.8
84
78
80
90
June
89.2
94
90
93
93
July
96.7
100
100
98
98
August
97.5
98
100
100
99
September
95.3
99
100
99
84
October
89.4
97
98
89
91
November
83.3
92
77
83
90
December
80.0
81
93
90
70
Average
82.0
68.0
87.7
87.9
86.4
84.6
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.