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
55.2
60
57
49
February
54.0
64
33
78
March
61.9
67
61
58
April
73.3
66
79
May
82.4
70
96
June
76.5
77
76
July
78.0
73
89
August
70.5
75
64
September
74.0
61
82
October
63.0
59
73
November
53.2
68
31
December
40.9
44
35
Average
63.5
63.4
60.5
66.6
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
5.6
6
6
5
February
7.7
9
6
8
March
7.5
9
7
6
April
9.7
10
10
May
16.2
14
18
June
20.2
21
20
July
20.4
21
20
August
21.3
20
24
September
17.2
21
15
October
14.0
13
15
November
8.0
8
8
December
3.9
6
0
Average
10.6
7.8
12.1
12.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
3.4
3
4
3
February
5.4
7
4
5
March
4.8
7
4
4
April
7.6
7
8
May
14.2
12
16
June
18.6
19
18
July
18.4
19
18
August
18.8
18
21
September
14.9
18
13
October
11.7
10
13
November
6.0
5
7
December
2.2
4
-2
Average
8.4
5.4
9.8
10.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
52.9
43
57
58
February
53.0
40
57
60
March
42.7
28
62
20
April
42.2
38
45
May
35.0
47
22
June
25.9
29
21
July
50.4
57
37
August
38.8
48
24
September
35.8
45
30
October
34.2
43
14
November
40.1
49
26
December
51.8
61
31
Average
41.6
37.1
51.3
36.4
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
11.7
12
11
12
February
12.9
11
13
16
March
8.8
8
10
7
April
10.6
9
12
May
7.6
7
8
June
7.4
8
7
July
9.1
9
9
August
8.8
10
7
September
6.4
7
6
October
8.6
9
9
November
9.3
10
9
December
10.0
11
7
Average
9.9
10.3
9.8
9.5
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
245°
254°
295°
February
249°
268°
271°
March
207°
259°
266°
April
334°
273°
May
320°
265°
June
331°
274°
July
248°
298°
August
264°
317°
September
289°
263°
October
237°
245°
November
234°
125°
December
250°
306°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.