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
65.3
48
61
75
64
67
February
68.3
65
48
76
78
78
March
74.1
79
66
55
85
79
April
90.1
79
94
88
96
May
89.0
88
90
91
90
83
June
90.0
94
90
83
84
91
July
89.3
86
86
91
90
August
92.4
91
89
87
95
September
84.5
83
79
90
84
October
78.9
74
72
67
82
November
68.1
61
68
67
79
December
55.8
37
53
53
60
Average
81.9
79.1
75.7
78.6
81.3
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
4.6
4.7
2.7
5.5
5.9
1.9
February
5.3
4.2
6.2
6.9
6.5
2.9
March
7.8
10.0
7.9
6.7
9.1
7.4
April
11.9
11.4
11.6
11.5
9.5
May
16.6
16.0
19.3
16.3
15.5
13.4
June
20.4
19.1
18.0
22.6
19.0
20.6
July
20.8
19.5
19.5
20.3
22.5
August
21.2
21.0
19.6
22.6
19.1
September
17.9
18.8
20.6
17.0
17.8
October
13.1
13.0
11.9
14.3
13.0
November
8.2
8.0
6.2
8.9
8.5
December
5.2
6.7
4.2
1.3
3.9
Average
12.6
10.9
12.7
12.6
13.0
11.7
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
0.1
0.1
-2.0
1.3
1.5
-2.3
February
0.1
-2.9
2.2
0.9
1.1
-4.7
March
0.4
0.9
2.5
-1.7
-3.9
-1.9
April
2.2
3.5
2.1
1.0
-1.9
May
6.8
5.2
9.5
6.0
6.7
6.2
June
10.5
9.8
9.5
10.0
10.6
10.5
July
11.8
11.5
11.1
11.5
13.8
August
12.0
12.0
12.1
12.0
10.8
September
9.6
9.4
11.6
8.8
10.4
October
7.2
6.7
6.7
8.4
7.5
November
3.4
2.3
0.9
5.5
3.5
December
1.2
3.0
0.4
-5.7
-1.5
Average
5.2
3.0
5.8
5.2
5.3
4.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
32.4
38
32
47
38
40
February
30.1
12
46
19
46
17
March
19.8
8
21
40
4
23
April
16.7
34
17
16
13
May
14.0
16
16
6
14
35
June
13.8
20
24
7
22
7
July
19.8
29
37
19
13
August
19.3
19
34
8
15
September
22.6
22
20
26
15
October
29.8
23
43
29
30
November
32.8
31
46
40
39
December
31.5
39
43
19
24
Average
21.1
18.0
26.9
28.1
22.1
20.7
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
10.0
9
13
10
12
7
February
10.5
9
11
12
12
10
March
10.2
10
10
10
9
10
April
10.3
10
10
11
11
May
9.5
10
9
10
10
8
June
8.7
11
9
8
8
8
July
9.4
9
10
11
8
August
8.2
9
9
7
9
September
8.4
8
8
9
8
October
9.2
9
12
9
9
November
8.5
8
8
11
9
December
8.9
9
11
6
9
Average
9.3
9.9
9.4
9.7
9.5
8.8
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
219°
246°
223°
266°
224°
February
143°
224°
268°
242°
096°
March
249°
132°
244°
137°
261°
April
192°
073°
302°
311°
May
283°
106°
309°
256°
248°
June
245°
243°
271°
244°
257°
July
232°
237°
262°
275°
August
227°
257°
241°
275°
September
126°
211°
083°
230°
October
199°
242°
210°
222°
November
243°
097°
141°
243°
December
221°
244°
127°
131°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.