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
87.8
83
90
84
97
92
February
89.5
90
90
85
84
95
March
91.6
91
88
91
94
95
April
91.5
88
92
99
95
May
82.5
75
77
95
93
June
0
0
0
0
July
77.8
64
83
73
94
August
90.2
93
87
79
93
September
93.8
89
96
91
93
October
96.8
97
96
92
99
November
94.2
99
98
94
92
December
88.2
94
89
100
85
Average
90.5
89.1
85.5
88.0
89.6
94.2
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.