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
2024
2023
2022
January
27.4
33
29
21
February
57.7
71
46
63
March
55.1
46
62
46
April
56.8
64
45
May
77.7
79
77
June
89.7
100
83
July
87.0
77
100
August
74.2
71
82
September
61.1
73
56
October
58.6
68
48
November
39.6
47
23
December
29.8
39
15
Average
51.7
46.4
57.6
51.1
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
2024
2023
2022
January
2.6
4
2
2
February
5.9
7
5
6
March
8.0
8
8
8
April
8.6
8
9
May
15.0
14
16
June
21.0
22
20
July
21.6
20
23
August
22.5
20
27
September
16.6
20
14
October
13.0
13
13
November
6.2
6
7
December
2.9
5
-1
Average
9.3
6.2
10.9
10.7
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
0.9
2
1
0
February
4.0
6
3
3
March
5.7
6
5
7
April
6.9
6
8
May
13.9
13
15
June
19.7
22
18
July
20.5
19
22
August
21.0
18
26
September
14.9
19
13
October
11.7
12
11
November
4.7
4
5
December
1.5
4
-2
Average
7.7
4.5
9.2
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
56.1
69
46
53
February
44.9
38
43
52
March
50.5
30
64
39
April
44.1
33
63
May
20.0
21
19
June
10.2
13
9
July
25.9
36
13
August
50.0
59
24
September
36.1
32
38
October
29.3
45
11
November
53.4
59
40
December
58.2
59
58
Average
45.0
47.8
48.1
39.0
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
2024
2023
2022
January
11.1
13
10
10
February
12.5
13
9
16
March
11.1
9
13
8
April
8.6
8
10
May
8.1
8
8
June
8.0
9
8
July
9.1
10
8
August
9.8
11
6
September
8.8
7
10
October
8.3
9
8
November
10.7
12
7
December
10.1
12
6
Average
10.5
11.8
10.5
9.4
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
260°
268°
268°
February
246°
285°
264°
March
270°
249°
026°
April
325°
263°
May
336°
275°
June
310°
290°
July
263°
288°
August
259°
037°
September
253°
268°
October
234°
227°
November
259°
248°
December
257°
268°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.