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
75.9
67
65
28
99
100
February
75.8
55
73
34
97
100
March
80.7
74
58
52
99
100
April
84.9
59
67
99
100
May
84.3
61
60
100
100
June
80.5
58
56
96
100
July
84.6
74
52
100
100
August
81.6
57
56
99
100
September
82.6
60
56
99
99
October
84.4
74
53
99
100
November
89.1
100
55
98
100
December
91.5
100
53
98
99
Average
85.1
64.1
67.5
52.5
98.6
99.7
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.