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
91.1
86
96
99
85
93
February
88.0
89
86
94
85
90
March
85.9
85
83
92
83
82
April
83.9
83
75
68
94
May
85.4
89
72
90
89
June
86.9
90
87
82
91
July
86.4
86
86
80
91
August
88.1
88
83
86
94
September
88.7
96
82
91
84
October
91.5
91
88
92
83
November
90.8
95
87
88
88
December
91.0
93
91
92
90
Average
88.2
86.8
89.8
86.6
85.3
88.9
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.