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
88.4
87
86
91
83
100
February
85.3
82
94
93
78
93
March
93.1
86
99
96
97
90
April
96.1
96
97
96
99
May
95.2
87
95
97
96
June
98.4
95
99
100
99
July
98.3
98
100
100
98
August
99.1
99
100
99
99
September
97.1
96
95
98
97
October
87.6
93
88
98
90
November
84.3
87
93
70
89
December
85.8
88
86
96
85
Average
92.3
84.9
93.5
95.3
93.8
95.0
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.