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
73.5
77
82
75
82
78
February
83.1
82
90
91
95
70
March
91.1
96
85
93
95
91
April
93.0
99
90
95
84
May
94.4
99
91
99
97
June
96.1
96
94
98
98
July
96.8
97
97
97
97
August
96.0
98
94
91
94
September
92.6
92
94
93
93
October
89.6
90
94
95
90
November
69.5
66
88
54
67
December
66.2
69
72
48
58
Average
88.7
85.8
90.5
90.6
90.4
87.5
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
2.7
5.4
2.7
5.4
3.1
1.9
February
5.2
3.9
10.0
4.5
7.0
3.2
March
9.9
12.3
11.8
10.5
9.5
8.1
April
14.3
16.3
12.0
11.1
10.8
May
19.1
22.5
17.6
20.6
18.0
June
24.6
24.6
23.0
25.8
25.1
July
25.4
26.6
25.8
25.0
26.5
August
25.6
27.0
25.3
26.1
22.0
September
20.1
22.5
23.3
17.1
19.1
October
15.5
15.3
16.5
16.6
14.9
November
7.9
6.5
7.9
7.5
8.0
December
3.7
4.5
4.7
0.2
2.2
Average
13.7
7.3
15.8
14.7
14.6
13.4
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
-4.5
-2.0
-4.5
-1.8
-3.7
-5.9
February
-3.8
-5.7
2.7
-3.7
-1.3
-6.9
March
-1.7
1.0
2.6
0.8
-3.7
-2.1
April
3.2
5.7
3.0
2.2
1.1
May
8.0
9.5
7.2
8.0
6.7
June
13.4
13.9
11.8
13.0
12.8
July
14.1
15.5
14.0
13.9
16.3
August
14.5
15.0
15.4
15.1
12.5
September
10.1
11.3
12.3
8.6
9.5
October
5.4
5.5
6.7
5.5
3.6
November
1.2
-1.8
1.3
1.1
1.9
December
-2.4
-1.0
-1.5
-4.3
-3.2
Average
4.5
-2.3
6.4
5.8
5.2
4.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
18.5
14
27
19
23
22
February
14.7
5
19
16
15
19
March
8.3
7
15
10
6
7
April
11.9
11
12
13
21
May
8.2
2
10
3
8
June
3.5
5
4
3
2
July
4.7
1
5
8
5
August
5.7
4
7
3
15
September
8.0
8
8
9
4
October
8.9
11
9
3
4
November
12.3
14
21
13
14
December
17.8
14
28
28
18
Average
9.2
8.2
9.5
10.9
8.6
10.7
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
7.3
6
9
6
10
6
February
8.0
5
8
9
10
8
March
7.9
7
6
8
7
8
April
7.8
7
6
8
8
May
7.0
6
7
7
8
June
6.4
5
6
6
6
July
6.2
5
6
7
5
August
5.6
5
5
6
6
September
6.3
7
5
6
6
October
6.5
6
7
6
7
November
6.4
6
8
5
7
December
6.9
6
9
6
7
Average
6.8
6.2
6.2
6.7
6.7
6.6
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
252°
251°
247°
252°
251°
February
001°
249°
261°
248°
280°
March
299°
056°
247°
038°
258°
April
252°
348°
282°
256°
May
070°
055°
266°
255°
June
263°
020°
319°
030°
July
280°
254°
272°
293°
August
290°
239°
050°
253°
September
074°
068°
298°
283°
October
319°
248°
251°
239°
November
257°
255°
049°
241°
December
257°
245°
031°
267°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.