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
87.3
82
88
88
93
91
February
89.3
93
91
92
96
76
March
86.2
88
94
89
90
77
April
92.1
92
85
93
94
May
90.2
87
92
97
89
June
91.5
94
93
85
89
July
88.3
81
88
94
89
August
95.1
98
97
93
93
September
94.4
98
93
96
96
October
96.4
94
97
94
98
November
90.4
97
96
90
85
December
92.2
99
93
97
94
Average
90.8
87.8
92.5
91.7
92.9
89.4
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
2.1
2.5
2.7
1.6
1.3
1.6
February
4.1
2.3
6.2
5.0
2.5
6.0
March
10.7
11.0
10.3
12.3
10.4
11.6
April
16.4
18.8
16.6
16.8
17.0
May
21.0
20.6
22.0
20.8
20.1
June
25.2
26.3
25.1
25.1
25.1
July
28.7
28.6
28.6
29.1
30.3
August
29.5
31.8
29.6
27.8
29.0
September
26.0
28.3
26.8
25.6
26.3
October
19.2
20.3
20.0
18.0
19.6
November
11.9
13.1
10.5
13.9
12.4
December
3.8
4.2
4.2
2.3
5.0
Average
15.4
5.3
17.6
16.9
16.6
17.1
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
-5.1
-4.0
-4.0
-6.4
-6.2
-7.9
February
-4.8
-5.2
-1.5
-3.9
-5.4
-3.5
March
2.6
2.2
2.6
3.1
2.7
3.6
April
8.3
10.0
8.8
8.9
9.3
May
13.2
13.4
14.3
13.5
12.6
June
18.4
18.8
18.8
19.0
18.3
July
23.2
23.6
23.6
23.6
24.3
August
23.8
25.8
23.6
23.0
22.8
September
19.5
22.3
21.0
18.8
19.5
October
12.0
13.5
12.5
11.3
12.5
November
4.6
6.5
3.7
6.0
4.9
December
-4.8
-3.7
-3.9
-5.0
-3.5
Average
8.3
-3.9
10.8
10.0
9.8
9.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
6.8
11
13
6
3
7
February
6.8
3
15
0
5
4
March
4.5
8
6
2
4
9
April
6.8
6
7
1
9
May
9.3
13
11
0
19
June
8.1
4
9
10
10
July
12.6
16
16
10
5
August
13.5
5
18
19
16
September
10.6
9
13
9
10
October
5.8
8
2
10
8
November
8.7
13
12
4
14
December
6.7
1
14
11
7
Average
8.3
7.2
8.9
9.4
7.2
9.8
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
7.8
8
8
8
8
8
February
8.8
10
8
8
10
9
March
9.4
10
10
9
9
9
April
9.4
7
9
10
9
May
9.1
9
8
11
10
June
8.3
8
8
10
8
July
8.4
10
9
8
8
August
8.3
8
8
9
8
September
8.1
7
7
8
8
October
8.0
7
8
8
8
November
8.3
9
10
8
8
December
8.2
8
8
7
9
Average
8.6
9.4
8.3
8.2
8.8
8.4
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
303°
326°
313°
311°
330°
February
294°
350°
305°
284°
291°
March
272°
267°
264°
260°
281°
April
274°
240°
237°
273°
May
247°
228°
237°
242°
June
259°
248°
213°
243°
July
197°
211°
243°
248°
August
250°
290°
223°
236°
September
015°
327°
346°
054°
October
003°
275°
312°
322°
November
330°
281°
305°
301°
December
308°
338°
326°
313°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.