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
51.0
76
20
22
65
34
February
58.9
52
51
33
79
31
March
74.2
79
84
43
86
51
April
78.6
91
34
91
81
May
77.4
97
27
80
92
June
0
0
0
0
July
69.9
81
30
99
87
August
74.6
85
49
89
93
September
68.8
78
36
96
82
October
53.1
80
27
46
51
November
43.4
63
30
17
61
December
45.4
51
58
49
38
Average
69.0
69.4
80.4
34.8
80.7
73.7
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.