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
94.7
99
92
96
100
93
February
93.2
96
95
83
91
91
March
91.3
96
91
84
89
91
April
88.9
93
83
89
93
May
88.9
90
89
100
96
June
90.1
94
83
79
92
July
95.4
94
92
100
95
August
94.7
91
96
92
91
September
94.6
98
92
100
99
October
86.9
89
84
70
100
November
87.7
91
86
82
100
December
92.4
94
90
89
100
Average
91.7
97.1
92.5
88.1
86.3
93.1
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.