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
77.6
85
83
68
72
82
February
88.6
91
82
93
76
96
March
90.6
83
97
92
94
April
93.5
91
96
93
100
May
95.6
94
99
96
99
June
96.5
97
99
95
94
July
95.9
98
97
91
98
August
96.1
94
95
95
98
September
94.7
98
93
92
99
October
92.1
84
97
97
91
November
79.8
91
81
82
79
December
77.9
77
62
73
83
Average
90.9
88.3
90.7
92.5
89.3
93.1
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.