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
2025
2024
2023
2022
2021
January
66.3
64
81
78
61
61
February
79.3
76
67
79
82
89
March
86.4
86
81
97
88
92
April
91.8
95
86
90
94
May
88.3
79
86
92
92
June
89.7
89
92
93
81
July
93.7
95
91
98
89
August
91.8
92
91
96
91
September
88.8
83
93
91
86
October
84.5
71
90
87
86
November
73.1
64
80
68
75
December
63.5
45
78
54
63
Average
84.1
76.3
80.9
87.5
86.7
84.6
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
2025
2024
2023
2022
2021
January
6.7
5.7
6.2
7.5
6.7
6.2
February
9.0
7.0
10.8
9.0
9.8
9.0
March
11.9
12.4
12.3
11.3
12.9
12.1
April
15.0
14.0
13.0
14.4
13.0
May
18.3
17.6
17.8
19.3
16.3
June
22.5
19.8
24.6
23.0
22.1
July
24.3
22.6
22.8
26.1
22.6
August
23.9
23.8
22.6
26.6
21.0
September
20.6
18.3
23.8
19.3
22.1
October
16.3
15.4
17.8
17.6
15.8
November
10.5
9.9
10.9
11.0
9.9
December
7.9
7.7
9.1
3.1
8.5
Average
14.8
8.4
14.9
15.9
16.3
14.9
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
1.6
0.5
1.1
2.9
1.7
0.8
February
2.7
1.3
6.0
2.1
3.7
2.2
March
4.0
3.7
5.0
4.7
4.4
2.2
April
5.2
6.4
5.0
5.0
2.2
May
8.3
9.6
8.4
9.0
6.5
June
11.7
10.4
12.9
11.6
11.8
July
13.4
13.5
13.5
13.9
13.5
August
13.5
14.0
13.9
14.5
12.6
September
11.0
11.1
13.9
11.3
11.5
October
8.7
9.3
9.4
10.8
7.2
November
4.8
5.2
6.0
6.2
3.0
December
3.2
3.2
5.2
-1.1
3.9
Average
6.7
1.9
7.9
8.2
7.9
6.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
34.5
41
21
41
27
40
February
30.7
29
57
12
39
22
March
30.4
16
34
44
21
27
April
19.3
34
29
19
17
May
20.3
33
14
15
41
June
16.3
20
5
19
21
July
15.2
21
24
1
29
August
19.9
18
15
11
32
September
23.4
39
11
34
12
October
26.6
29
24
20
30
November
37.8
24
68
41
32
December
38.5
32
37
11
32
Average
24.9
27.6
29.3
24.5
20.0
27.5
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
2025
2024
2023
2022
2021
January
8.9
10
10
12
8
8
February
10.1
9
12
8
12
9
March
9.8
9
10
12
10
9
April
8.5
10
9
10
8
May
7.9
8
9
8
10
June
7.1
7
8
7
6
July
7.4
7
9
7
7
August
7.3
8
8
8
7
September
7.7
9
7
8
7
October
8.9
8
9
9
9
November
9.0
9
12
11
7
December
9.5
9
11
7
9
Average
8.4
8.9
8.6
9.5
8.6
7.9
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
184°
223°
226°
230°
247°
February
128°
218°
343°
229°
136°
March
063°
189°
222°
091°
291°
April
234°
002°
018°
039°
May
237°
009°
301°
250°
June
301°
024°
216°
003°
July
245°
241°
316°
290°
August
239°
261°
010°
300°
September
223°
174°
243°
145°
October
138°
194°
184°
199°
November
154°
224°
192°
292°
December
235°
221°
087°
214°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.