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
95.0
99
95
96
89
99
February
93.8
97
93
95
97
89
March
96.8
100
95
100
94
96
April
97.4
99
100
97
98
May
97.0
99
98
97
97
June
97.9
100
98
100
97
July
97.6
97
100
97
97
August
99.1
100
100
100
98
September
98.3
100
97
100
95
October
98.6
98
97
98
100
November
97.0
92
99
98
96
December
94.2
96
94
96
93
Average
97.2
98.7
97.3
97.8
96.9
96.2
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
17.0
18.3
19.1
16.5
16.1
17.5
February
18.4
18.3
18.6
17.0
18.1
20.8
March
20.3
20.6
22.5
20.8
19.0
19.6
April
21.6
22.1
23.5
19.8
21.3
May
25.1
25.8
23.3
26.6
25.1
June
29.1
29.1
28.5
30.3
28.8
July
32.9
32.3
35.3
31.8
32.1
August
33.1
33.5
32.7
33.2
32.5
September
30.1
29.5
30.3
30.6
30.8
October
26.9
27.6
28.1
30.0
25.6
November
21.5
23.3
22.6
22.8
18.3
December
18.3
17.1
18.6
21.0
18.0
Average
24.0
19.1
25.1
24.8
25.1
24.2
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
5.9
7.7
7.7
6.0
3.5
7.2
February
6.5
6.5
8.5
6.0
5.5
8.5
March
8.9
10.5
9.4
8.3
10.6
7.7
April
10.3
10.5
9.0
10.8
10.9
May
13.2
13.4
13.9
13.8
14.0
June
17.4
18.1
18.0
18.8
18.3
July
21.2
21.5
24.3
21.5
21.3
August
21.6
22.6
20.6
21.1
22.5
September
19.2
19.1
19.8
21.0
21.1
October
14.6
17.3
16.5
16.6
13.8
November
11.1
14.3
10.9
11.8
11.8
December
7.4
6.0
7.9
11.4
6.9
Average
12.6
8.3
14.1
13.5
13.9
13.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
5.8
8
4
8
3
5
February
4.5
5
10
8
2
4
March
5.0
3
3
3
9
2
April
4.4
1
0
10
4
May
2.5
1
8
2
1
June
0.6
0
3
1
1
July
0.0
0
0
0
0
August
0.2
0
1
1
1
September
0.9
1
2
1
1
October
1.9
2
1
0
0
November
7.6
2
3
4
19
December
5.0
5
6
4
3
Average
3.1
4.7
2.0
3.2
2.8
2.9
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
6.6
7
6
8
6
8
February
7.2
6
9
7
7
8
March
8.1
8
8
7
8
7
April
8.2
8
9
9
8
May
7.8
8
9
7
8
June
8.0
9
7
7
9
July
7.6
8
7
8
7
August
7.9
8
8
8
7
September
7.6
8
7
8
8
October
6.7
7
8
5
7
November
7.4
6
8
8
9
December
6.4
6
6
7
7
Average
7.5
7.1
7.8
7.5
7.3
7.8
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
275°
279°
257°
320°
290°
February
312°
284°
341°
013°
305°
March
288°
289°
300°
200°
045°
April
009°
013°
326°
018°
May
002°
012°
001°
010°
June
029°
026°
019°
020°
July
028°
020°
028°
015°
August
029°
029°
032°
012°
September
019°
029°
340°
024°
October
304°
335°
351°
020°
November
277°
293°
274°
259°
December
286°
285°
243°
276°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.