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
82.6
95
78
80
69
91
February
88.8
88
86
98
88
97
March
92.5
91
94
92
91
97
April
92.0
85
94
92
100
May
96.7
98
96
94
99
June
94.5
95
96
92
90
July
96.7
99
97
93
August
95.5
96
96
90
September
93.8
98
95
88
97
October
92.0
94
100
94
86
November
88.5
89
93
85
95
December
87.1
83
69
84
88
Average
92.4
90.9
92.5
93.8
89.3
94.2
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.