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
57.1
71
64
59
49
48
February
62.0
66
63
71
59
58
March
67.6
76
67
64
51
80
April
73.0
66
67
68
89
May
89.3
87
91
92
97
June
96.2
99
90
97
97
July
96.1
96
98
96
94
August
96.5
94
99
95
97
September
97.6
98
99
98
96
October
94.1
98
98
97
96
November
78.0
92
85
79
80
December
65.7
77
79
67
61
Average
80.6
71.2
84.3
84.2
80.2
83.8
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.