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
90.2
96
89
93
89
87
February
90.7
95
89
93
92
91
March
92.4
97
93
92
90
93
April
88.2
91
78
92
93
May
86.8
92
86
88
89
June
87.3
92
85
90
83
July
89.0
93
90
89
88
August
94.8
96
89
94
98
September
94.0
99
91
91
95
October
85.7
91
83
85
90
November
82.6
88
86
81
79
December
85.8
92
85
83
89
Average
89.8
96.1
92.1
87.9
88.7
89.5
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.