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
76.0
61
78
59
74
82
February
79.0
60
72
65
71
72
March
76.6
62
68
60
61
64
April
70.0
59
47
57
66
May
70.5
56
52
53
61
June
68.1
53
51
48
61
July
67.1
57
52
47
62
August
66.8
59
60
51
59
September
73.7
62
60
54
64
October
75.2
66
63
55
63
November
76.2
64
78
55
64
December
74.4
58
76
52
78
Average
72.4
60.8
61.6
58.9
55.7
65.4
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
7.4
10.0
8.8
9.5
7.0
8.5
February
10.4
7.7
13.5
10.8
9.9
11.4
March
13.8
15.6
15.3
14.0
8.9
11.6
April
17.7
21.0
15.4
17.8
16.6
May
22.4
22.3
18.8
24.3
24.5
June
27.8
32.7
25.3
28.1
28.3
July
31.2
34.2
33.7
30.3
32.3
August
31.0
33.0
31.6
29.3
33.5
September
26.0
25.6
26.3
25.5
25.6
October
20.4
21.3
22.8
20.6
15.5
November
13.7
12.1
15.0
14.6
13.3
December
9.2
8.5
11.6
11.1
8.5
Average
18.4
11.2
20.7
19.6
19.3
19.1
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
-1.3
1.3
-1.7
1.7
-2.0
0.3
February
1.0
0.0
3.1
-1.7
-0.0
0.4
March
2.9
4.0
3.5
3.1
-1.3
0.6
April
6.4
7.5
5.0
5.0
4.2
May
11.4
10.5
9.5
10.9
10.6
June
16.0
17.6
14.0
16.1
14.5
July
18.3
19.6
18.3
16.8
18.5
August
18.1
18.5
17.8
17.0
18.3
September
13.8
13.5
14.3
12.8
13.5
October
9.2
9.3
10.6
9.0
6.5
November
5.1
2.6
5.0
6.2
5.4
December
1.9
1.9
1.8
5.5
0.8
Average
7.9
1.8
8.9
8.4
8.1
7.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
10.3
11
8
13
9
14
February
7.2
5
7
3
10
11
March
10.1
14
11
7
14
13
April
9.7
8
14
10
11
May
5.8
5
17
4
2
June
3.4
1
8
5
3
July
2.5
2
0
4
3
August
2.1
4
2
6
1
September
3.7
5
10
1
5
October
4.2
0
4
4
18
November
8.1
9
10
10
10
December
11.0
22
6
16
11
Average
6.4
10.0
6.3
7.7
7.1
7.7
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
5.1
3
6
5
6
5
February
4.8
3
4
5
6
5
March
4.8
4
4
5
5
6
April
4.1
4
5
5
5
May
3.9
4
3
3
5
June
4.0
4
3
4
4
July
4.6
5
5
5
5
August
4.4
4
5
5
5
September
4.1
4
4
4
4
October
3.4
4
3
3
4
November
3.4
4
4
4
3
December
4.7
5
4
2
7
Average
4.2
3.2
4.0
4.4
4.4
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
349°
335°
328°
344°
331°
February
338°
330°
334°
337°
339°
March
163°
316°
314°
354°
335°
April
018°
336°
269°
308°
May
202°
029°
140°
299°
June
169°
344°
358°
345°
July
026°
328°
358°
010°
August
049°
020°
006°
309°
September
243°
071°
309°
010°
October
313°
348°
354°
340°
November
342°
323°
329°
310°
December
344°
334°
010°
334°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.