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
89.0
84
87
88
91
92
February
90.5
94
92
91
95
87
March
90.2
93
95
90
91
86
April
95.5
97
89
96
96
May
93.6
96
93
99
90
June
95.9
98
95
91
96
July
91.9
90
84
95
95
August
96.3
100
95
96
96
September
96.8
98
97
95
99
October
96.9
94
95
93
99
November
91.7
96
96
89
86
December
91.3
99
91
95
90
Average
93.0
90.1
95.1
91.8
93.8
92.8
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
3.2
3.3
2.6
2.5
2.1
February
5.2
3.2
7.5
6.7
3.7
7.5
March
12.7
13.0
11.8
15.0
12.5
13.9
April
18.4
21.1
18.5
19.6
19.0
May
23.4
23.0
24.5
23.8
21.8
June
27.6
29.5
27.6
26.8
27.5
July
30.3
29.8
30.3
31.1
32.3
August
30.7
33.5
31.1
29.1
29.8
September
27.0
29.8
27.8
27.1
27.1
October
20.2
21.1
21.1
19.3
20.3
November
12.6
14.4
11.1
15.0
13.0
December
3.9
4.5
4.7
2.2
5.0
Average
16.8
6.6
19.1
18.5
18.3
18.3
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
-8.8
-7.9
-6.5
-8.5
-9.0
-9.6
February
-5.1
-8.5
-2.9
-5.7
-8.5
-4.5
March
1.4
1.5
1.0
1.8
1.3
2.7
April
7.4
10.0
7.9
7.9
8.4
May
12.8
12.5
13.5
12.1
12.3
June
18.3
18.3
18.8
19.3
18.5
July
23.2
24.1
23.5
23.6
23.8
August
23.3
25.3
23.5
22.3
22.1
September
17.8
21.5
19.3
17.0
18.1
October
9.3
11.4
9.8
8.8
10.5
November
1.9
3.5
1.3
3.2
2.2
December
-6.6
-5.0
-4.2
-7.0
-6.5
Average
6.9
-4.0
9.7
8.7
8.2
8.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
7.4
11
13
10
5
8
February
6.9
3
17
1
5
3
March
4.8
7
7
3
5
9
April
7.7
9
13
0
8
May
9.7
15
13
1
18
June
9.6
6
12
20
12
July
16.2
24
24
14
8
August
15.5
7
19
24
17
September
11.0
14
15
9
9
October
6.4
9
4
11
11
November
7.0
9
13
4
8
December
6.6
1
16
10
6
Average
9.0
6.8
10.9
12.2
9.2
9.9
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
6.0
6
6
6
6
7
February
7.1
8
6
7
8
8
March
7.7
9
8
7
7
7
April
8.1
6
8
8
8
May
7.7
8
7
9
8
June
6.9
7
7
8
6
July
6.7
8
7
7
6
August
6.5
6
6
7
6
September
6.4
6
6
7
7
October
6.1
5
6
6
6
November
6.2
6
7
6
6
December
6.3
6
7
6
7
Average
6.9
7.6
6.6
6.7
7.1
6.8
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
287°
311°
300°
316°
309°
February
281°
298°
303°
285°
284°
March
272°
264°
267°
269°
274°
April
265°
233°
246°
263°
May
256°
235°
254°
243°
June
260°
250°
223°
245°
July
198°
210°
249°
238°
August
258°
292°
231°
219°
September
075°
010°
015°
095°
October
355°
285°
320°
297°
November
308°
267°
311°
286°
December
293°
309°
311°
309°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.