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
81.0
79
87
74
83
91
February
86.7
80
89
82
82
92
March
93.0
95
93
93
98
89
April
95.0
95
90
99
91
May
95.4
96
98
95
94
June
95.5
97
96
94
97
July
98.0
98
99
99
99
August
98.4
98
98
100
98
September
94.8
96
98
94
97
October
92.1
97
91
93
93
November
89.3
91
88
91
93
December
75.8
66
77
79
82
Average
91.6
85.5
92.9
91.9
93.0
93.5
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.