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
93.1
95
90
83
97
92
February
90.8
86
94
94
91
89
March
90.8
92
90
96
90
89
April
92.4
86
91
94
90
May
92.5
95
93
96
94
June
0
0
0
0
July
68.6
53
86
49
91
August
89.8
84
95
91
97
September
96.0
89
98
99
98
October
97.0
98
97
93
98
November
97.0
100
98
97
97
December
0
0
0
0
Average
91.3
90.3
88.0
93.9
91.1
93.6
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.