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
88.8
79
94
88
94
85
February
89.7
86
86
89
88
95
March
91.6
91
95
86
93
91
April
92.5
87
93
93
98
94
May
83.5
75
82
87
92
June
81.1
71
72
88
89
July
82.0
86
83
69
94
August
89.4
85
87
91
96
September
92.2
87
94
85
94
October
93.5
96
89
84
95
November
95.0
99
97
92
94
December
93.4
98
96
95
99
Average
88.1
87.2
85.5
85.5
87.0
92.8
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.