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
46.4
38
48
28
57
50
February
64.9
47
55
81
74
March
82.1
79
79
99
83
April
86.2
85
76
72
86
May
93.6
97
97
91
91
June
93.9
91
97
91
96
July
91.6
89
93
89
98
August
92.6
94
89
98
90
September
88.2
98
94
71
75
October
74.1
75
63
67
91
November
49.7
63
67
36
61
December
39.3
35
38
30
54
Average
75.3
38.1
78.1
75.9
77.2
82.6
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
-2.8
2.3
-4.5
0.1
-1.6
-4.9
February
0.1
2.9
0.2
1.7
-5.9
March
5.5
8.0
5.2
5.5
3.9
April
12.0
13.5
12.6
8.6
10.4
May
18.1
20.1
18.6
16.3
16.1
June
23.6
23.1
23.5
23.8
25.1
July
23.6
25.6
23.5
23.0
27.8
August
24.0
25.5
25.8
26.3
21.8
September
18.4
23.6
21.6
14.0
14.1
October
11.5
11.5
10.5
11.5
11.3
November
4.0
3.9
3.3
3.1
5.0
December
0.1
1.3
0.3
-4.2
-2.3
Average
10.7
2.4
13.0
12.2
11.3
10.6
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
-6.5
-2.9
-9.4
-4.5
-6.5
-7.4
February
-5.1
-1.0
-5.2
-3.2
-12.5
March
-3.2
-2.3
-3.9
-5.2
-4.3
April
1.4
3.2
3.2
0.4
1.1
May
5.7
5.5
3.1
4.5
6.7
June
11.4
12.0
10.8
11.3
12.6
July
12.8
14.5
11.6
11.9
15.4
August
12.6
12.6
14.3
14.5
11.5
September
7.7
11.0
7.7
5.0
5.7
October
4.0
3.3
4.0
4.4
2.1
November
0.1
0.4
-1.7
-1.1
-1.9
December
-4.6
-2.3
-4.9
-8.0
-7.2
Average
2.8
-2.9
4.1
3.4
2.9
2.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
30.2
19
39
32
38
38
February
26.8
23
40
27
30
March
16.0
10
32
6
17
April
16.0
22
18
38
10
May
7.4
3
6
13
12
June
5.7
6
6
6
5
July
9.2
11
8
14
2
August
5.0
2
4
3
9
September
8.1
3
5
8
19
October
13.3
13
21
14
6
November
22.3
13
26
39
18
December
30.0
19
43
47
32
Average
14.4
18.6
12.6
18.2
18.8
13.9
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
8.6
10
8
9
11
8
February
9.1
9
10
11
9
March
8.8
8
10
9
9
April
9.0
9
8
10
9
May
8.0
7
7
9
9
June
7.3
7
8
7
7
July
7.2
7
8
7
7
August
6.6
7
7
8
7
September
7.5
8
6
7
8
October
8.1
7
10
8
9
November
8.1
9
9
7
10
December
8.4
8
8
10
9
Average
8.1
9.7
7.8
8.2
8.3
8.2
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
209°
226°
178°
287°
176°
February
195°
279°
235°
323°
March
148°
272°
334°
277°
April
248°
061°
007°
250°
May
063°
022°
296°
236°
June
313°
004°
296°
008°
July
266°
286°
316°
056°
August
297°
202°
060°
239°
September
122°
183°
327°
322°
October
302°
267°
271°
200°
November
254°
228°
107°
223°
December
233°
232°
140°
263°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.