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
99.3
100
98
100
100
98
February
99.3
100
98
98
100
100
March
99.8
100
100
100
100
100
April
99.6
99
100
99
100
May
99.9
100
100
100
100
100
June
99.4
100
100
97
100
99
July
100.0
100
100
100
100
August
99.7
100
100
100
99
September
99.9
100
100
100
100
October
99.8
100
100
100
100
November
99.3
100
100
98
100
December
99.8
100
100
100
100
Average
99.7
99.9
99.5
99.4
99.6
99.6
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.
Maximum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
19.0
20.1
21.1
18.3
19.3
18.0
February
19.1
19.5
20.8
18.3
19.1
18.8
March
19.4
19.1
20.0
20.8
18.5
19.1
April
20.4
21.5
21.5
19.3
20.6
May
21.9
21.3
22.0
22.5
22.1
22.1
June
23.4
23.8
23.1
24.6
23.1
23.1
July
25.2
25.6
25.5
25.1
25.1
August
26.6
27.5
28.3
25.5
26.6
September
25.6
25.3
26.1
25.8
25.6
October
24.5
25.3
26.5
24.3
24.5
November
21.9
23.1
22.6
22.5
21.3
December
20.2
20.1
21.1
21.5
20.1
Average
22.1
20.8
22.9
23.0
22.2
22.1
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
15.4
16.1
17.1
15.1
16.1
14.1
February
14.9
14.9
16.8
14.0
15.9
13.9
March
14.9
14.1
15.0
16.3
14.0
15.1
April
15.6
16.5
16.6
14.9
15.6
May
17.0
16.3
17.1
18.0
17.1
17.3
June
18.8
19.1
18.6
20.0
18.3
18.3
July
20.2
20.6
20.8
19.8
19.8
August
21.6
22.5
22.8
20.5
21.5
September
21.0
21.0
21.1
21.1
21.3
October
20.0
20.3
21.3
20.0
19.8
November
17.7
18.6
18.5
18.1
17.3
December
16.5
16.8
17.3
17.1
16.5
Average
17.6
16.1
18.4
18.5
17.7
17.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
6.0
5
8
7
6
10
February
5.9
4
5
6
7
7
March
5.3
11
3
2
7
5
April
4.1
2
1
7
3
May
2.1
3
2
3
1
2
June
3.2
1
4
5
1
4
July
1.2
1
2
1
1
August
1.6
2
1
1
3
September
2.4
3
4
2
3
October
4.3
3
4
3
3
November
5.7
6
1
5
5
December
7.0
8
3
12
7
Average
3.9
4.4
3.7
3.1
3.9
4.1
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
9.8
10
11
11
10
7
February
9.9
9
10
10
12
8
March
10.5
11
10
9
9
11
April
9.8
10
11
11
9
May
10.4
9
9
11
11
12
June
10.0
9
10
10
10
11
July
11.3
10
11
11
13
August
12.0
14
12
11
10
September
9.6
10
8
8
9
October
9.8
10
9
11
10
November
8.7
8
8
7
10
December
9.7
12
9
12
11
Average
10.2
9.7
10.2
9.9
10.1
10.1
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
245°
213°
017°
040°
021°
February
346°
017°
015°
013°
351°
March
348°
357°
034°
360°
015°
April
021°
022°
019°
340°
May
020°
021°
005°
016°
018°
June
020°
015°
028°
014°
018°
July
024°
021°
018°
022°
August
019°
023°
022°
025°
September
022°
016°
027°
020°
October
020°
283°
005°
022°
November
209°
017°
028°
020°
December
020°
020°
218°
346°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.