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
85.9
93
100
87
77
85
February
84.5
94
86
88
77
March
94.4
97
100
91
85
April
89.7
87
93
85
May
90.0
82
91
96
June
87.0
78
100
85
93
July
83.0
89
88
82
August
84.4
80
80
85
September
90.8
82
95
94
92
October
89.9
90
72
94
86
November
92.0
90
95
100
91
December
86.6
86
85
91
Average
88.7
94.8
85.1
87.1
89.4
86.4
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.