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
90.5
85
100
68
100
93
February
92.7
94
91
93
97
89
March
85.8
87
83
87
94
87
April
89.3
89
86
82
97
May
92.4
91
89
100
93
June
0
0
0
0
July
98.9
100
100
100
100
August
92.4
91
97
91
94
September
92.7
89
96
93
98
October
96.6
96
98
97
97
November
95.9
99
100
94
100
December
0
0
0
0
Average
91.6
89.3
90.1
93.5
92.6
94.5
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.