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
27.5
92
81
5
10
1
February
27.2
92
93
3
3
4
March
28.0
96
95
3
7
5
April
18.0
98
7
2
1
May
24.5
97
50
5
3
June
30.5
99
100
3
5
July
30.7
97
100
3
4
August
32.1
97
97
4
4
September
34.0
91
96
3
14
October
30.8
95
85
7
7
November
33.5
92
80
12
7
December
25.4
77
68
8
20
Average
34.7
93.6
93.5
60.5
5.0
5.7
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.