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
22.5
14
33
41
22
16
February
44.7
39
58
58
42
38
March
46.2
63
34
51
42
59
April
59.4
50
66
39
75
May
72.1
67
67
56
88
June
49.8
61
44
35
38
July
27.2
24
13
22
25
August
29.3
31
38
34
13
September
30.6
14
36
25
22
October
36.4
34
58
43
25
November
19.9
7
50
16
28
December
16.7
16
28
10
29
Average
38.5
38.8
35.8
46.2
32.4
38.3
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.