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
75.4
79
68
88
72
77
February
78.3
55
83
92
86
90
March
82.6
74
76
92
90
90
April
94.1
88
94
99
99
May
94.7
99
97
91
94
June
96.3
98
99
97
94
July
96.8
98
99
94
98
August
92.4
85
91
91
94
September
90.2
88
99
91
86
October
84.3
79
84
81
88
November
72.9
71
79
90
79
December
74.8
75
77
70
71
Average
86.4
69.2
86.7
92.8
89.5
90.2
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.