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
62.4
58
47
71
60
52
February
78.6
70
77
91
89
82
March
88.8
89
97
70
90
96
April
94.5
99
97
98
92
May
99.1
100
99
99
99
June
99.7
100
100
100
100
July
100.0
100
100
100
100
August
99.6
100
100
100
99
September
99.4
98
100
100
99
October
95.3
99
86
97
99
November
76.9
95
71
62
79
December
54.7
69
31
64
34
Average
87.7
73.2
91.7
88.1
90.2
88.3
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.