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
79.2
76
74
83
75
94
February
84.8
89
89
81
85
87
March
93.6
89
96
92
92
97
April
92.7
95
94
90
95
96
May
92.7
92
95
88
94
June
91.2
91
96
92
91
July
89.6
92
98
88
77
August
93.6
100
93
95
92
September
95.9
98
99
94
93
October
96.1
98
96
99
99
November
96.5
98
96
98
96
December
82.6
78
78
83
81
Average
90.5
87.4
91.8
92.0
90.3
91.3
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.