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
67.4
60
58
99
56
62
February
65.4
57
80
68
53
64
March
61.5
59
100
57
49
49
April
69.0
100
76
44
49
May
75.3
95
81
59
43
June
92.2
100
100
85
65
July
97.1
100
100
95
85
August
98.7
100
100
100
92
September
95.0
99
96
98
85
October
88.8
94
88
94
85
November
72.0
67
72
77
72
December
65.9
67
60
100
60
Average
78.6
58.4
89.6
84.5
75.5
67.6
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.