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
85.6
89
78
99
77
96
February
90.7
83
94
97
92
98
March
94.2
98
95
89
93
95
April
97.8
99
99
100
100
May
98.9
95
100
99
99
June
99.6
100
100
100
99
July
99.7
100
100
100
100
August
99.5
100
100
100
100
September
99.5
100
100
99
99
October
97.9
99
99
96
98
November
90.8
100
92
90
82
December
82.6
88
64
96
65
Average
95.0
90.1
96.1
96.5
95.8
95.3
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.