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
36.2
34
35
45
24
43
February
63.8
73
67
74
51
61
March
71.5
80
74
75
69
73
April
82.7
80
97
83
98
May
86.4
81
94
98
96
June
90.9
94
94
98
95
July
84.6
83
91
90
87
August
84.2
94
94
89
84
September
80.6
86
75
89
83
October
63.8
58
73
66
67
November
50.6
42
24
65
69
December
39.6
37
29
54
39
Average
69.0
62.7
69.6
74.0
73.8
71.9
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.