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
83.1
88
81
78
84
93
February
81.6
87
88
89
82
88
March
92.0
80
99
95
98
93
April
96.6
98
96
97
96
May
96.8
96
99
95
97
June
98.4
98
98
99
96
July
99.5
100
100
100
100
August
99.5
99
100
100
99
September
98.7
100
98
99
99
October
84.5
92
87
87
80
November
80.0
91
90
72
74
December
82.4
83
86
83
84
Average
91.6
84.5
94.7
94.2
92.7
92.6
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.