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
60.8
65
62
66
65
64
February
70.8
59
63
76
83
87
March
85.5
88
82
92
88
93
April
93.7
94
94
92
100
May
95.1
98
92
94
93
June
94.7
98
94
97
88
July
95.3
94
95
98
96
August
94.2
90
93
91
96
September
92.9
92
92
96
94
October
84.8
88
87
88
85
November
63.2
79
61
60
79
December
60.3
65
31
55
69
Average
85.0
72.5
87.3
86.5
87.7
89.4
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.