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
43.0
13
58
17
22
17
February
58.8
42
92
41
31
25
March
76.3
75
77
59
52
72
April
97.0
97
96
95
91
May
99.5
99
99
100
June
92.1
97
92
100
67
July
88.4
89
72
100
75
August
92.3
87
96
0
87
September
83.0
82
66
83
63
October
70.7
52
73
43
80
November
38.9
6
62
3
42
December
29.6
9
1
0
25
Average
65.3
54.8
65.8
66.1
27.0
43.4
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.