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
90.1
89
93
92
92
92
February
91.3
85
89
87
92
95
March
88.8
88
87
81
90
91
April
84.9
76
82
89
86
May
85.0
83
79
87
85
June
86.6
87
85
87
92
July
90.3
88
86
93
91
August
93.6
95
89
96
96
September
93.1
94
96
90
95
October
92.5
95
94
93
96
November
88.7
92
90
86
88
December
88.8
83
90
90
88
Average
89.3
87.0
88.3
87.3
90.2
91.0
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.