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
97.7
96
99
100
97
96
February
90.6
87
83
97
79
100
March
85.1
83
100
83
90
85
April
78.6
15
56
74
88
May
87.5
82
92
87
84
June
89.6
87
97
69
82
July
95.2
94
94
96
95
August
93.4
86
89
96
97
September
90.4
80
92
79
98
October
97.0
98
93
99
95
November
95.9
89
93
100
100
December
96.2
93
96
96
98
Average
90.8
88.3
88.9
89.6
87.9
92.5
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.