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
91.3
94
87
82
90
94
February
89.6
96
79
73
92
97
March
92.6
94
97
83
90
95
April
87.6
90
82
87
83
85
May
83.9
87
88
77
79
June
86.6
88
83
88
87
July
88.9
91
82
90
93
August
96.6
95
96
96
97
September
97.1
97
99
94
98
October
96.5
99
96
94
98
November
93.9
99
87
93
90
December
92.0
94
93
87
96
Average
91.5
93.7
91.3
87.3
89.4
92.5
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.