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
62.0
67
64
66
50
60
February
75.7
63
76
81
80
80
March
81.4
75
79
85
79
92
April
95.4
97
91
94
96
May
87.7
71
97
90
96
June
96.5
97
96
99
95
July
92.8
93
94
92
93
August
94.3
93
94
97
97
September
91.4
100
96
92
89
October
65.3
89
84
10
November
59.9
74
70
76
23
December
63.2
62
69
50
68
Average
82.3
68.9
83.9
88.9
85.4
80.2
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.