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
75.6
89
54
89
82
89
February
81.0
87
82
100
75
91
March
88.8
77
96
94
89
91
April
93.4
81
93
95
98
May
96.7
97
100
98
98
June
96.2
98
100
97
94
July
99.1
100
100
99
100
August
98.3
100
98
96
98
September
97.8
94
97
99
98
October
93.6
98
96
99
85
November
67.9
89
62
89
73
December
68.4
74
53
67
44
Average
89.5
83.3
90.5
92.9
92.1
90.5
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.