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
23.7
12
12
24
9
23
February
52.5
32
71
76
35
46
March
80.1
64
84
98
54
90
April
88.3
81
93
99
73
99
May
97.6
99
100
94
100
June
87.5
100
93
75
90
July
76.5
50
72
86
90
August
70.7
100
79
77
67
September
63.0
0
59
74
43
October
53.9
56
57
38
November
38.4
24
41
12
December
19.4
7
13
2
25
Average
62.4
48.9
57.6
70.2
57.5
62.5
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.