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
57.5
59
64
45
May
65.3
49
79
77
June
77.7
69
100
83
July
84.0
81
77
100
August
74.4
75
71
82
September
68.4
82
73
56
October
55.8
53
68
48
November
39.6
47
23
December
29.8
39
15
Average
56.3
60.4
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
8.9
10
8
9
May
14.8
14
14
16
June
20.3
19
22
20
July
21.7
22
20
23
August
21.5
20
20
27
September
16.2
16
20
14
October
12.5
12
13
13
November
6.2
6
7
December
2.9
5
-1
Average
11.7
13.4
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
7.0
7
6
8
May
13.3
12
13
15
June
18.8
18
22
18
July
20.3
20
19
22
August
20.3
19
18
26
September
14.4
14
19
13
October
10.7
9
12
11
November
4.7
4
5
December
1.5
4
-2
Average
10.0
11.5
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
47.9
57
33
63
May
34.6
55
21
19
June
17.7
24
13
9
July
29.2
32
36
13
August
42.2
21
59
24
September
33.3
28
32
38
October
30.6
32
45
11
November
53.4
59
40
December
58.2
59
58
Average
42.1
39.3
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
9.5
12
8
10
May
7.8
8
8
8
June
7.8
8
9
8
July
8.5
8
10
8
August
9.2
8
11
6
September
9.1
10
7
10
October
7.2
6
9
8
November
10.7
12
7
December
10.1
12
6
Average
9.7
9.4
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
266°
325°
263°
May
265°
336°
275°
June
284°
310°
290°
July
266°
263°
288°
August
294°
259°
037°
September
243°
253°
268°
October
308°
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.