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
87.7
88
0
100
93
84
February
90.8
94
91
87
March
86.6
90
90
100
83
82
April
86.7
90
86
83
May
95.2
92
98
96
June
95.7
98
91
97
July
96.5
98
95
97
August
97.8
97
100
98
98
September
95.0
99
100
94
89
October
96.2
98
98
94
99
November
95.0
95
97
75
95
December
87.8
85
94
75
86
Average
94.2
90.7
94.4
96.8
92.0
90.7
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.