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
82.9
80
95
86
85
72
February
90.3
94
86
99
91
97
March
97.6
94
99
99
99
99
April
97.0
96
97
97
100
May
97.5
97
99
98
100
June
98.6
100
98
97
99
July
98.6
98
99
97
99
August
98.3
100
98
97
100
September
96.5
96
99
97
94
October
89.0
90
90
82
88
November
84.0
96
83
74
65
December
78.1
83
75
85
62
Average
93.4
89.7
95.5
95.3
92.9
92.2
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.