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
77.7
87
80
72
79
74
February
86.6
79
83
93
87
92
March
92.5
91
96
94
93
April
93.7
90
97
96
97
May
95.5
91
97
99
100
June
96.9
98
99
93
99
July
96.1
96
99
92
96
August
96.4
95
99
95
98
September
94.1
96
94
93
94
October
94.5
94
98
92
98
November
84.8
86
90
81
87
December
77.1
79
76
68
82
Average
90.8
83.0
91.2
94.2
90.7
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.