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
82.5
80
91
68
88
89
February
90.1
80
93
90
90
92
March
93.6
94
80
97
95
April
93.7
89
92
95
92
May
94.0
95
94
94
95
June
95.2
94
95
92
97
July
96.0
95
97
94
99
August
97.2
94
99
98
99
September
96.7
99
98
90
97
October
92.4
97
99
93
93
November
88.7
93
88
80
93
December
83.4
80
91
89
85
Average
91.2
80.2
93.1
91.5
92.2
94.3
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.