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
73.7
80
78
73
79
59
February
88.8
96
91
97
88
96
March
95.5
99
98
99
94
95
April
95.9
90
97
96
100
May
96.1
92
99
99
97
June
96.3
94
99
98
93
July
98.4
99
100
99
98
August
96.9
97
96
96
98
September
96.8
99
92
96
100
October
92.9
97
87
95
88
November
85.2
94
74
83
69
December
79.1
94
86
62
81
Average
92.5
92.3
93.8
93.2
92.1
91.0
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.