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
55.4
39
56
42
59
30
February
63.7
49
54
80
62
59
March
82.1
70
88
90
89
84
April
93.6
96
92
92
96
May
95.8
91
97
96
100
June
98.7
97
98
100
98
July
99.4
99
100
99
100
August
98.9
100
97
100
100
September
93.9
96
95
94
95
October
71.3
67
64
94
69
November
61.9
64
61
78
49
December
45.7
40
39
44
36
Average
79.4
53.6
81.4
83.7
85.7
79.6
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.