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
45.3
51
49
38
February
35.1
30
22
54
March
45.9
42
53
36
April
64.8
78
56
May
52.5
47
58
June
68.8
62
73
July
62.6
63
62
August
65.9
66
67
September
60.4
60
61
October
45.2
41
54
November
43.0
45
40
December
34.5
33
37
Average
47.4
40.8
48.9
52.5
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
4.9
3
6
6
February
6.7
7
6
7
March
6.9
8
7
6
April
7.7
8
8
May
12.9
12
14
June
16.7
18
16
July
16.7
17
16
August
18.5
17
20
September
14.7
16
13
October
13.0
13
14
November
7.1
7
7
December
3.6
5
1
Average
8.9
6.0
10.5
10.2
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
4
4
February
4.1
5
3
4
March
4.0
6
4
3
April
5.7
6
6
May
10.5
9
12
June
14.7
16
14
July
14.8
15
15
August
16.1
15
17
September
13.0
15
11
October
10.7
10
12
November
5.1
5
6
December
1.7
4
-1
Average
6.7
3.8
8.3
8.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
47.5
53
50
40
February
50.2
44
35
72
March
44.3
29
55
38
April
61.7
68
58
May
25.7
23
28
June
18.1
21
17
July
49.5
44
62
August
35.2
45
8
September
45.8
12
58
October
57.3
61
49
November
47.6
50
43
December
45.1
52
32
Average
45.0
43.8
46.1
45.2
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
12.3
12
13
12
February
13.1
12
11
16
March
10.6
9
12
9
April
12.6
11
14
May
10.4
9
12
June
9.0
10
9
July
9.5
10
9
August
9.2
10
7
September
9.8
7
11
October
10.3
11
8
November
10.9
11
10
December
10.2
11
8
Average
11.0
11.1
10.9
11.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
258°
244°
270°
February
246°
278°
257°
March
232°
270°
073°
April
226°
258°
May
340°
278°
June
296°
263°
July
246°
299°
August
270°
339°
September
212°
294°
October
250°
230°
November
261°
173°
December
263°
086°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.