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
86.1
93
84
79
90
86
February
82.6
87
91
81
79
85
March
86.6
93
83
81
88
88
April
91.9
90
96
91
97
May
95.5
97
98
96
97
June
94.2
95
95
95
94
July
99.6
100
100
100
100
August
92.0
99
95
79
95
September
81.2
99
90
92
29
October
94.5
98
96
94
92
November
92.6
99
97
83
97
December
87.3
98
86
80
88
Average
90.1
90.7
94.0
91.1
88.8
86.7
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.