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
89.4
94
89
94
86
86
February
87.2
92
94
82
84
82
March
86.7
72
76
94
87
92
April
93.2
96
95
97
91
May
93.4
97
90
92
96
June
92.6
99
89
95
90
July
88.0
88
92
92
96
August
90.7
92
93
88
97
September
95.3
94
91
99
96
October
92.4
92
93
85
91
November
87.1
87
77
92
97
December
86.6
86
83
91
89
Average
90.0
82.7
91.8
90.5
91.5
93.0
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.