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
42.5
56
51
52
53
0
February
63.7
56
67
74
73
50
March
87.6
83
80
97
88
90
April
94.0
92
92
95
97
May
96.7
99
98
92
97
June
97.5
98
97
99
96
July
96.6
96
95
99
97
August
89.7
87
95
83
94
September
91.3
95
91
90
91
October
72.7
79
79
92
78
November
54.1
67
65
62
76
December
42.3
56
49
56
53
Average
68.3
67.5
85.2
87.5
86.0
83.1
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.