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
23.3
39
12
30
20
20
February
43.7
55
36
42
48
52
March
80.4
75
86
78
85
95
April
95.0
99
99
97
95
May
98.3
99
99
99
99
June
99.1
99
99
100
100
July
99.5
99
100
100
99
August
99.0
96
99
100
100
September
98.5
96
99
99
99
October
94.9
93
96
97
98
November
65.4
71
57
71
77
December
27.3
35
34
36
23
Average
78.3
58.0
80.6
82.4
83.4
83.6
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.