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
0.2
0
0
0
0
1
February
2.7
4
2
3
3
4
March
4.0
7
2
6
2
9
April
5.6
6
9
3
10
May
5.4
7
5
12
11
June
1.3
0
2
1
1
July
3.9
5
7
2
3
August
1.9
2
7
4
0
September
4.0
5
6
10
2
October
6.1
7
19
6
5
November
3.8
6
2
1
7
December
0.3
1
0
1
0
Average
3.3
3.7
3.6
5.7
3.7
4.5
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.