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
86.4
86
91
93
74
81
February
91.2
86
100
96
86
85
March
92.1
93
88
94
98
89
April
93.4
91
93
97
89
May
92.0
98
94
88
87
June
90.4
92
93
89
90
July
88.2
93
89
83
92
August
82.7
90
72
86
78
September
90.0
98
89
93
96
October
89.3
92
92
86
91
November
86.9
75
83
98
88
December
84.3
88
90
81
87
Average
89.0
88.6
91.6
89.6
88.3
87.8
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.