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
62.1
56
52
46
48
64
February
67.6
81
57
64
41
64
March
68.7
86
54
62
45
63
April
69.0
60
65
53
55
May
67.6
59
64
49
51
June
72.0
73
64
54
56
July
73.3
69
65
64
56
August
72.8
67
67
60
52
September
71.8
59
64
66
59
October
68.2
55
56
72
53
November
60.4
54
59
42
48
December
60.0
58
47
49
50
Average
70.4
75.3
60.4
60.9
54.2
55.8
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
9.5
12.3
10.9
10.4
10.0
9.9
February
12.2
11.5
14.6
12.0
12.3
13.4
March
15.3
16.8
16.1
15.1
11.9
13.5
April
19.3
21.6
16.5
19.0
17.8
May
23.8
24.1
21.1
25.6
25.1
June
29.0
33.0
26.8
30.6
30.0
July
33.0
35.5
34.1
33.1
34.1
August
32.9
34.7
31.8
31.6
34.5
September
27.1
25.3
27.8
26.3
27.3
October
22.3
22.5
24.5
23.0
19.0
November
16.1
16.0
16.3
16.8
16.8
December
11.0
11.0
12.3
14.0
10.1
Average
20.2
13.6
22.1
20.8
21.4
21.0
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
0.3
2.7
1.7
0.5
-2.5
2.3
February
1.5
1.1
1.6
-2.6
0.0
1.3
March
3.8
4.0
3.7
3.2
0.3
1.3
April
6.2
6.2
4.5
5.2
5.0
May
10.8
10.0
10.1
9.3
9.5
June
15.0
15.1
13.9
14.5
12.5
July
17.2
17.3
15.6
16.3
15.5
August
17.1
16.3
15.1
15.5
16.1
September
12.9
12.6
13.9
11.5
11.3
October
8.2
6.7
9.8
7.4
7.9
November
5.2
1.9
5.2
5.5
6.2
December
2.5
2.0
1.7
7.0
1.3
Average
7.8
2.6
7.9
7.7
7.6
7.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
16.0
10
17
22
7
32
February
13.0
12
13
2
15
22
March
10.9
10
11
14
10
9
April
9.7
5
17
15
8
May
8.1
3
23
6
4
June
4.4
1
8
3
4
July
1.2
1
0
1
2
August
1.4
0
2
5
1
September
4.9
4
10
4
6
October
5.9
4
5
4
18
November
13.7
4
20
16
16
December
17.8
12
6
22
32
Average
8.4
10.3
5.4
10.4
8.1
11.1
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
2.3
3
2
3
4
5
February
2.6
3
1
5
4
4
March
3.3
5
3
5
5
5
April
3.1
5
5
5
5
May
2.9
5
4
4
5
June
2.7
3
3
5
5
July
2.9
4
4
5
5
August
3.4
4
5
4
5
September
3.2
3
5
4
4
October
2.3
3
3
3
3
November
2.3
3
3
3
3
December
2.6
3
3
3
3
Average
2.8
3.7
3.4
4.0
4.2
4.3
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
113°
109°
126°
024°
142°
February
126°
091°
053°
027°
071°
March
131°
213°
306°
078°
324°
April
021°
275°
304°
295°
May
290°
084°
332°
299°
June
303°
310°
313°
305°
July
310°
307°
343°
312°
August
292°
356°
325°
307°
September
308°
055°
308°
334°
October
284°
140°
356°
104°
November
319°
304°
095°
132°
December
081°
124°
133°
097°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.