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
94.5
91
94
89
96
February
90.3
88
78
89
86
0
March
91.9
88
95
84
86
April
94.6
88
96
96
100
May
93.5
93
94
91
June
90.7
89
87
85
July
82.5
79
82
72
84
August
85.0
77
87
84
87
September
91.9
95
89
93
94
October
92.1
93
80
92
94
November
94.7
95
95
91
98
December
96.9
93
93
98
97
Average
91.2
89.0
88.8
88.5
88.6
92.9
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.