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
89.2
100
81
82
90
100
February
90.8
93
90
91
87
90
March
90.4
91
87
91
89
90
April
93.4
94
95
91
95
91
May
88.5
90
79
93
94
June
0
0
0
0
July
52.6
27
52
0
0
August
90.0
91
94
87
90
September
95.1
92
92
99
99
October
97.4
98
99
98
92
November
97.1
96
100
100
98
December
0
0
0
0
Average
92.2
92.8
91.4
92.2
92.6
91.2
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.