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
30.7
92
82
28
4
7
February
46.2
100
95
99
18
25
March
43.1
97
99
97
27
15
April
38.7
100
93
21
47
May
32.0
94
100
12
15
June
29.8
100
99
11
6
July
29.9
100
100
13
6
August
30.1
99
100
5
11
September
36.9
100
100
30
20
October
36.8
94
81
39
16
November
37.5
96
72
25
26
December
24.9
73
73
13
23
Average
41.8
96.2
95.1
88.8
17.6
17.4
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.