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
85.5
87
90
82
85
89
February
87.4
92
88
79
89
83
March
92.7
94
94
94
94
88
April
92.8
95
90
94
93
May
92.9
91
96
93
94
June
93.8
95
95
95
95
July
91.6
95
90
92
88
August
92.5
93
92
94
95
September
90.6
87
92
91
93
October
87.6
89
89
86
86
November
84.2
82
92
83
73
December
83.8
84
92
90
78
Average
89.7
91.0
90.3
90.3
90.5
88.0
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.