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
84.1
88
88
92
77
90
February
89.3
83
93
92
84
94
March
90.8
95
94
93
85
96
April
92.6
90
93
94
99
May
94.1
94
92
94
95
June
92.9
95
96
92
85
July
90.9
95
94
88
84
August
91.1
97
92
89
86
September
91.5
89
96
88
88
October
89.3
86
92
87
88
November
89.3
91
96
83
78
December
82.0
85
78
80
86
Average
90.4
89.2
92.0
92.9
87.9
89.3
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.