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
51.1
44
63
49
51
41
February
65.4
70
57
68
60
66
March
76.7
86
60
78
95
68
April
86.8
81
97
90
84
May
94.1
99
97
93
89
June
96.0
99
100
93
97
July
96.3
94
99
97
98
August
91.9
94
82
97
88
September
87.4
82
86
96
92
October
76.3
85
86
71
70
November
62.7
55
66
57
77
December
57.9
55
59
67
66
Average
82.3
70.4
82.5
85.7
86.2
82.7
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
-1.2
1.3
-6.7
0.1
-1.3
-3.6
February
-1.1
-1.1
-2.5
0.0
0.3
-5.4
March
2.9
5.5
3.5
1.3
4.5
2.2
April
8.7
7.2
10.8
7.5
8.5
May
15.9
19.6
16.1
14.3
14.6
June
21.4
21.8
22.0
21.6
24.3
July
22.3
22.6
21.0
22.5
26.0
August
21.1
22.1
20.8
23.8
19.1
September
15.7
18.5
18.3
13.5
12.8
October
9.3
11.3
7.2
10.5
10.3
November
4.0
4.5
1.3
3.6
3.6
December
0.1
2.1
-3.0
-3.7
-5.9
Average
9.1
2.1
10.5
9.7
10.3
9.3
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
-7.9
-4.3
-13.0
-4.5
-7.0
-8.5
February
-7.3
-6.7
-7.7
-7.9
-6.5
-13.5
March
-5.6
-2.1
-3.5
-6.0
-6.7
-5.2
April
-1.3
0.0
-1.5
-2.3
0.3
May
4.3
6.0
3.2
3.7
5.2
June
10.1
10.6
8.0
10.8
11.6
July
12.3
14.1
11.0
12.3
14.0
August
11.7
12.0
12.8
12.9
11.5
September
7.6
9.3
10.3
4.5
5.7
October
3.4
4.0
1.6
3.7
5.5
November
-1.8
0.3
-3.0
0.2
-2.7
December
-5.8
-3.0
-8.5
-8.2
-10.3
Average
1.6
-4.4
2.6
1.7
2.1
1.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
41.4
43
47
36
46
53
February
32.5
29
37
34
39
29
March
20.4
13
19
26
10
29
April
14.6
27
2
16
15
May
8.9
1
7
15
14
June
6.6
6
3
7
3
July
8.7
11
11
8
4
August
10.9
10
21
2
15
September
11.9
12
9
11
9
October
22.3
12
25
20
23
November
31.1
34
42
38
25
December
39.0
44
51
46
26
Average
17.7
25.0
17.0
17.4
16.1
16.7
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
9.1
8
10
9
11
8
February
9.1
8
9
9
10
7
March
9.4
9
7
9
8
10
April
9.1
9
9
9
10
May
8.6
8
9
10
9
June
8.6
9
7
9
8
July
8.1
9
8
8
8
August
8.5
8
8
9
10
September
8.6
7
9
7
9
October
9.1
9
10
9
11
November
8.7
9
7
9
9
December
8.6
8
7
6
8
Average
8.7
8.4
8.3
8.4
8.7
8.9
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
214°
228°
188°
277°
056°
February
214°
132°
269°
198°
342°
March
243°
146°
245°
260°
244°
April
313°
060°
278°
231°
May
205°
227°
237°
154°
June
206°
263°
213°
205°
July
194°
218°
228°
210°
August
213°
140°
161°
184°
September
169°
209°
020°
338°
October
216°
303°
222°
198°
November
240°
038°
064°
266°
December
234°
029°
076°
298°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.