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
96.0
95
96
94
98
98
February
95.6
92
90
98
99
99
March
92.8
91
95
87
91
98
April
91.3
96
87
96
93
May
81.4
75
74
86
92
June
82.8
84
75
80
88
July
79.4
76
75
81
81
August
85.6
89
84
79
84
September
82.1
71
91
83
76
October
87.5
87
84
92
91
November
92.0
80
95
94
99
December
95.9
95
93
95
99
Average
89.6
92.8
86.6
86.8
90.0
91.9
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.