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
85.4
90
85
87
75
88
February
84.7
91
90
82
75
88
March
86.1
82
95
87
84
80
April
92.3
94
89
96
89
May
94.8
97
96
93
94
June
98.6
98
99
100
100
July
98.8
100
100
99
100
August
98.9
99
100
99
99
September
96.0
96
98
99
91
October
94.6
96
94
95
93
November
91.5
94
84
93
86
December
83.3
92
86
73
84
Average
92.2
87.1
95.0
92.7
91.4
91.5
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.