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
12.3
16
31
7
15
3
February
27.6
40
23
22
21
45
March
67.2
73
80
74
57
91
April
98.3
99
99
99
100
May
98.8
100
99
98
100
June
99.4
100
100
100
98
July
99.5
100
100
98
100
August
99.3
100
100
98
100
September
98.5
98
96
100
100
October
96.6
100
94
96
99
November
68.9
71
79
77
80
December
20.7
31
34
19
10
Average
74.3
45.3
81.8
80.8
77.6
81.4
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.