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
56.2
61
73
57
50
12
February
52.5
64
52
44
45
23
March
71.4
85
98
43
71
64
April
93.0
93
100
93
88
98
May
98.6
100
100
97
98
June
99.1
100
98
99
100
July
92.0
95
94
89
85
August
90.3
93
88
94
81
September
98.5
98
99
100
98
October
98.9
99
99
100
99
November
94.7
93
96
99
98
December
69.7
65
100
70
100
Average
83.7
76.8
89.5
81.0
86.3
80.0
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.