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
2020
January
59.3
66
41
73
February
44.9
38
35
65
March
33.3
19
49
33
April
35.1
42
27
May
40.6
45
36
June
15.7
25
5
July
46.2
46
47
August
36.8
28
47
0
September
56.0
65
48
October
67.9
80
56
November
97.7
96
100
December
88.9
92
84
Average
33.7
40.5
52.1
49.2
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.