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
55.6
51
62
62
62
66
February
72.4
85
58
80
80
85
March
85.8
87
89
88
85
94
April
92.5
99
92
88
96
May
95.2
97
95
94
98
June
93.6
96
93
89
98
July
96.1
99
100
97
95
August
97.3
99
100
97
94
September
90.3
97
92
98
92
October
81.8
84
87
82
84
November
69.3
76
76
64
76
December
57.3
50
69
67
59
Average
82.2
75.1
84.8
87.2
84.2
87.1
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.