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
2025
2024
2023
2022
2021
January
99.9
100
100
100
100
100
February
99.8
100
100
100
100
100
March
99.7
100
100
100
100
100
April
99.9
100
100
100
100
May
99.9
100
100
100
100
June
99.9
100
100
100
100
July
99.9
100
100
100
100
August
99.9
100
100
100
100
September
100.0
100
100
100
100
October
99.7
100
100
100
100
November
99.9
100
100
100
100
December
99.9
100
100
100
100
Average
99.9
100.0
100.0
99.9
99.9
99.9
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.
Maximum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
19.3
19.3
20.6
19.6
18.8
18.6
February
19.2
18.8
19.6
19.1
17.8
18.8
March
19.1
18.8
20.0
19.3
18.6
18.6
April
20.0
20.8
20.1
20.6
19.3
May
20.1
21.6
19.0
20.3
19.8
June
19.9
20.6
20.3
19.6
20.0
July
20.6
21.0
21.8
20.6
20.6
August
21.0
21.6
21.5
20.6
21.0
September
21.1
22.0
21.3
21.6
21.1
October
21.6
22.3
22.5
21.6
22.1
November
21.1
20.6
21.1
22.8
20.3
December
19.8
20.3
20.5
17.8
19.8
Average
20.1
18.9
20.9
20.5
20.1
20.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
8.5
8.6
9.9
8.5
7.5
9.0
February
8.6
8.0
9.5
8.5
8.6
8.8
March
8.4
8.4
9.0
8.3
8.3
8.3
April
7.2
7.7
6.7
6.5
6.9
May
4.8
5.5
4.9
4.4
3.6
June
3.1
2.7
0.9
2.1
3.7
July
2.1
2.3
2.9
1.7
1.1
August
4.2
4.7
4.5
4.2
3.0
September
6.4
6.2
6.9
6.2
5.5
October
8.0
7.7
9.5
7.0
7.5
November
8.9
9.1
9.5
7.5
8.5
December
8.5
8.4
9.4
8.0
8.8
Average
6.7
8.3
6.9
6.7
5.9
6.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
9.2
9
5
5
11
8
February
11.4
13
8
10
12
7
March
8.3
10
9
6
9
7
April
3.6
2
2
2
3
May
2.9
2
8
1
0
June
0.9
1
0
0
1
July
0.7
1
0
0
0
August
0.8
0
1
1
0
September
2.0
2
3
4
3
October
4.3
1
3
1
4
November
4.8
7
7
1
7
December
6.3
5
7
5
6
Average
5.4
10.7
3.6
4.4
4.1
3.8
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2025
2024
2023
2022
2021
January
4.2
5
5
5
5
5
February
4.5
5
5
5
5
5
March
4.4
5
5
5
4
4
April
4.2
4
4
4
4
May
4.1
5
4
5
4
June
4.3
4
4
5
4
July
4.4
5
4
5
5
August
5.0
5
5
5
5
September
5.3
6
6
5
5
October
5.6
6
6
6
5
November
5.1
5
5
6
5
December
4.7
5
5
6
5
Average
4.6
4.6
5.0
4.9
4.9
4.7
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
034°
043°
017°
048°
014°
February
050°
033°
045°
359°
017°
March
018°
012°
035°
040°
066°
April
012°
006°
020°
357°
May
323°
319°
326°
358°
June
347°
325°
322°
318°
July
313°
355°
352°
336°
August
326°
354°
345°
343°
September
023°
005°
355°
028°
October
017°
005°
349°
012°
November
050°
020°
008°
353°
December
357°
018°
012°
004°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.