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
93.0
96
97
94
87
95
February
91.5
95
87
97
88
95
March
93.8
96
95
94
93
94
April
92.2
97
82
98
91
May
96.7
93
97
98
98
June
97.3
98
96
99
98
July
97.9
94
99
98
99
August
96.5
96
99
96
97
September
97.0
97
98
99
95
October
93.8
89
98
90
89
November
93.8
96
88
93
91
December
91.6
94
98
92
92
Average
94.5
95.5
94.3
94.8
93.9
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.