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
99.5
99
100
100
100
100
February
97.8
100
97
99
92
100
March
97.9
100
100
97
96
95
April
93.8
96
96
89
95
May
84.9
87
70
85
88
June
79.7
89
68
79
79
July
76.0
80
82
72
78
August
85.1
88
76
77
95
September
93.7
93
92
94
95
October
98.4
97
98
100
98
November
98.1
98
98
98
95
December
99.0
99
99
99
100
Average
93.6
99.5
94.2
90.0
90.9
93.7
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.