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
43.0
58
44
31
February
43.2
37
48
47
March
58.5
50
67
50
April
65.4
80
57
May
64.1
39
94
June
79.1
66
89
July
78.1
76
81
August
51.5
41
63
September
67.4
89
62
October
56.3
54
60
November
62.6
61
64
December
17.2
21
13
Average
54.1
45.3
57.5
59.5
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
4.6
3
6
5
February
6.5
8
6
6
March
6.0
8
7
4
April
7.5
8
8
May
12.9
13
13
June
17.8
19
17
July
16.8
17
17
August
16.1
16
16
September
15.5
17
14
October
12.6
12
14
November
7.1
6
9
December
2.0
4
1
Average
9.1
6.2
10.7
10.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
3.1
2
4
4
February
4.1
4
4
5
March
3.1
6
4
0
April
4.0
5
3
May
9.5
9
10
June
12.7
14
12
July
13.2
14
13
August
14.3
14
15
September
11.2
13
10
October
9.5
8
11
November
5.1
4
7
December
0.7
2
-1
Average
6.4
3.9
7.8
7.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
48.1
58
48
41
February
44.7
35
27
65
March
28.9
35
36
12
April
38.1
45
34
May
25.3
33
16
June
17.5
6
26
July
36.4
36
38
August
0.0
0
0
September
25.8
0
32
October
32.1
44
14
November
32.5
30
36
December
51.7
46
57
Average
35.7
40.7
32.5
33.9
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
2024
2023
2022
January
12.0
13
12
11
February
11.7
9
12
14
March
9.9
10
11
8
April
10.2
9
11
May
8.1
7
10
June
7.1
7
7
July
8.5
8
10
August
4.6
5
5
September
6.9
5
7
October
8.0
9
6
November
10.0
11
9
December
6.9
8
6
Average
9.5
10.1
9.4
9.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
219°
240°
246°
February
226°
249°
240°
March
204°
244°
244°
April
220°
233°
May
308°
268°
June
301°
263°
July
229°
271°
August
236°
030°
September
183°
252°
October
146°
212°
November
243°
145°
December
189°
082°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.