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
91.0
80
95
90
83
88
February
91.4
83
93
86
90
90
March
89.4
85
77
89
87
87
April
90.3
88
91
88
83
May
91.0
80
92
92
82
June
91.4
83
94
89
83
July
91.9
85
93
89
87
August
92.4
83
93
94
88
September
93.7
89
98
94
84
October
92.2
85
95
95
88
November
87.3
81
93
92
83
December
87.9
75
94
93
81
Average
90.0
82.4
84.4
92.1
90.6
85.3
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.