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
91.1
85
97
94
86
99
February
88.7
89
90
93
77
97
March
88.0
85
95
90
92
87
April
94.1
91
94
99
88
May
97.7
98
98
97
98
June
99.8
100
100
100
100
July
99.5
99
100
99
100
August
99.8
100
100
100
100
September
97.8
98
100
96
98
October
97.1
96
96
98
99
November
93.8
96
96
95
94
December
90.1
90
80
92
92
Average
94.3
86.4
96.1
96.0
94.8
96.1
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.