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
82.8
83
92
81
79
74
February
82.3
74
82
92
80
79
March
79.8
80
81
88
82
92
April
89.0
79
95
98
95
May
84.9
70
95
82
97
June
87.8
97
92
89
84
July
92.6
94
97
86
94
August
93.9
95
97
97
89
September
93.8
98
99
95
89
October
86.1
89
93
89
82
November
88.8
95
91
94
85
December
82.2
86
98
77
77
Average
86.6
78.7
88.0
93.5
88.0
87.9
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.