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
77.6
73
84
71
90
73
February
88.7
85
83
95
99
80
March
94.3
95
99
95
88
April
96.7
100
92
95
97
May
97.4
97
99
99
97
June
98.1
98
98
97
99
July
99.1
100
99
99
96
August
97.5
98
97
95
96
September
96.8
98
99
97
97
October
92.7
91
96
93
95
November
75.6
73
93
63
78
December
83.3
69
85
62
91
Average
91.6
79.0
92.5
94.8
92.7
92.0
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
2.6
3.2
2.5
4.5
3.6
1.3
February
5.2
2.9
8.8
5.2
7.0
3.2
March
9.4
12.4
9.3
9.8
8.0
April
13.9
16.1
10.9
11.4
10.5
May
18.3
19.3
17.8
20.3
15.1
June
23.9
23.0
22.8
24.8
24.6
July
25.3
26.1
26.1
24.8
24.3
August
24.9
26.6
24.6
24.8
21.1
September
19.8
20.3
23.5
17.3
20.3
October
14.6
14.0
16.5
15.6
14.0
November
7.0
6.2
7.5
7.4
6.0
December
3.8
3.1
4.9
-1.8
3.3
Average
12.9
3.0
14.9
14.5
14.4
12.7
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
-3.7
-2.6
-3.0
0.5
-1.4
-3.1
February
-2.6
-5.5
3.1
-2.8
0.6
-5.5
March
0.5
2.5
1.1
-2.3
-1.7
April
3.6
5.0
2.5
2.5
1.3
May
7.7
9.8
6.5
9.0
5.7
June
12.6
12.8
11.3
13.0
13.1
July
13.5
14.5
13.4
12.9
13.8
August
14.4
15.3
14.5
14.9
12.3
September
10.0
10.9
11.0
9.0
10.8
October
6.3
6.9
7.9
7.2
3.6
November
1.7
0.7
2.2
1.6
1.7
December
-1.4
-1.1
0.6
-5.7
-2.9
Average
4.6
-3.2
6.4
5.9
5.6
4.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
18.2
13
11
20
19
37
February
10.7
9
15
9
12
12
March
12.5
5
21
8
15
April
10.0
7
16
15
15
May
9.5
15
4
6
17
June
6.8
5
8
9
6
July
6.1
5
8
5
8
August
9.5
6
19
11
14
September
9.1
17
3
16
5
October
9.6
9
12
9
4
November
13.3
10
19
13
17
December
14.3
10
26
19
17
Average
10.3
10.8
9.1
12.8
11.0
13.0
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
9.4
8
11
10
11
8
February
9.3
6
10
10
15
6
March
9.4
8
11
7
9
April
8.7
10
8
10
9
May
7.9
8
7
8
10
June
7.0
7
7
7
6
July
7.3
7
8
7
7
August
6.8
6
8
6
8
September
7.1
9
6
7
6
October
8.1
7
9
6
8
November
7.6
8
11
6
9
December
9.0
8
11
7
9
Average
7.9
6.9
8.1
8.6
7.7
7.9
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
230°
245°
239°
254°
236°
February
071°
239°
255°
247°
304°
March
206°
241°
068°
264°
April
239°
332°
317°
296°
May
126°
047°
280°
253°
June
247°
004°
280°
331°
July
258°
244°
293°
256°
August
294°
247°
006°
252°
September
237°
226°
250°
278°
October
166°
232°
227°
225°
November
235°
235°
207°
227°
December
229°
235°
286°
236°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.