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
87.7
92
84
94
86
82
February
86.8
77
96
92
84
93
March
86.0
86
82
96
82
95
April
92.3
82
95
99
98
May
89.5
90
86
89
95
June
90.4
92
98
85
89
July
88.4
85
92
91
85
August
87.6
95
93
85
84
September
89.5
93
97
83
91
October
89.4
87
92
80
95
November
91.3
98
95
91
83
December
85.4
93
93
74
90
Average
88.4
84.5
89.5
93.4
86.3
90.1
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.