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
81.7
79
75
84
74
91
February
84.1
82
94
83
83
96
March
88.6
72
94
100
92
89
April
95.5
87
96
97
100
May
94.8
99
99
90
95
June
97.1
99
96
94
99
July
82.8
93
98
97
3
August
82.2
84
94
95
24
September
87.3
92
89
88
85
October
85.9
89
87
88
77
November
68.4
51
49
76
83
December
69.0
60
78
82
55
Average
86.2
76.7
88.7
91.4
90.4
71.9
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.