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
74.3
83
56
71
79
77
February
84.4
88
80
96
96
84
March
90.9
90
96
92
79
98
April
96.9
95
99
99
98
May
98.6
100
99
100
98
June
98.9
99
100
99
99
July
99.2
99
99
100
98
August
99.5
100
99
100
99
September
99.6
99
100
100
100
October
98.1
97
100
100
100
November
91.0
90
88
97
97
December
78.5
79
92
82
79
Average
92.7
87.1
92.3
95.3
94.9
94.8
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.