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
76.8
95
34
89
85
65
February
84.0
85
61
75
87
83
March
87.9
86
85
90
80
92
April
92.1
99
79
95
85
May
92.9
92
75
98
96
June
96.5
97
98
97
100
July
93.8
79
94
97
97
August
99.2
100
100
96
100
September
99.3
99
100
100
100
October
93.5
100
98
98
100
November
70.1
94
76
49
59
December
66.9
87
32
67
51
Average
88.9
88.2
86.3
85.4
86.6
86.3
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.