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
61.0
61
68
51
February
56.0
70
35
63
March
53.7
55
54
52
April
72.6
97
59
May
66.6
59
100
June
66.6
68
65
July
66.1
62
73
August
63.2
60
68
September
73.1
58
84
October
53.4
52
80
November
64.1
70
51
December
37.7
45
18
Average
60.3
61.0
58.7
61.2
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
5.1
4
7
5
February
7.0
8
5
8
March
8.0
10
7
7
April
10.3
11
10
May
15.6
14
18
June
19.8
21
19
July
20.1
20
20
August
20.9
19
22
September
16.6
20
14
October
13.5
13
14
November
7.4
8
7
December
4.6
7
1
Average
10.4
7.1
12.0
12.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
3.0
1
5
3
February
4.8
6
3
5
March
5.4
7
6
4
April
8.7
10
8
May
13.8
11
17
June
18.9
20
18
July
18.8
19
19
August
19.0
18
20
September
15.3
19
12
October
11.0
10
13
November
5.5
6
6
December
2.8
4
0
Average
8.3
4.6
10.1
10.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
57.7
54
61
57
February
60.0
58
49
73
March
53.3
49
66
22
April
39.2
30
44
May
37.0
42
13
June
21.3
32
9
July
51.5
56
44
August
40.7
56
21
September
28.0
6
43
October
56.9
61
0
November
52.5
59
38
December
70.0
70
71
Average
50.3
53.0
54.3
43.6
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
13.1
13
14
12
February
13.6
11
13
16
March
8.9
9
10
5
April
10.9
11
11
May
8.0
8
9
June
6.8
7
6
July
9.2
9
9
August
8.2
10
5
September
7.7
6
9
October
6.5
7
3
November
9.7
11
6
December
8.8
9
7
Average
10.1
10.9
10.0
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
252°
250°
270°
February
249°
275°
259°
March
264°
269°
263°
April
214°
275°
May
321°
293°
June
351°
298°
July
243°
302°
August
252°
352°
September
250°
285°
October
281°
209°
November
251°
214°
December
260°
132°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.