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
70.2
80
66
72
83
February
57.0
0
72
91
50
75
March
57.8
0
93
82
87
72
April
61.0
0
90
89
77
82
May
83.2
100
93
79
78
June
92.0
92
85
89
July
96.3
100
98
97
August
96.7
99
91
94
September
88.6
93
93
83
October
56.1
68
61
65
November
63.7
78
46
59
December
69.3
85
82
56
Average
69.0
81.4
88.1
76.5
79.4
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.