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
71.1
75
83
83
79
73
February
72.0
68
74
80
83
69
March
80.9
88
76
86
82
75
April
93.4
96
93
99
83
May
94.5
99
93
90
99
June
99.4
100
100
100
98
July
99.2
99
100
99
100
August
99.6
100
100
99
99
September
96.3
93
98
99
93
October
90.3
87
100
95
85
November
69.2
62
84
70
79
December
58.6
49
65
45
77
Average
86.5
77.6
87.1
91.6
89.7
87.7
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
6.5
2.3
2.7
2.5
4.5
February
3.3
-3.9
6.9
1.9
6.7
2.5
March
8.7
12.3
8.3
11.4
3.9
4.7
April
16.1
22.0
15.0
17.8
13.9
May
20.3
19.0
19.3
17.6
22.1
June
26.8
27.8
24.6
27.1
25.6
July
29.6
32.2
28.1
26.6
30.8
August
29.6
30.3
31.3
30.8
29.6
September
23.7
25.3
24.1
23.0
18.8
October
16.5
15.1
18.6
15.3
12.4
November
8.2
7.7
11.6
8.8
9.6
December
4.3
3.1
6.5
2.5
6.0
Average
14.6
5.8
16.7
16.3
15.6
15.1
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
-4.2
-1.0
-7.7
-4.0
-4.3
-3.1
February
-4.1
-10.4
-1.7
-6.5
-2.7
-6.5
March
0.0
2.6
0.0
2.2
-4.1
-3.7
April
5.3
9.3
5.5
6.2
5.9
May
10.0
8.5
9.8
8.6
10.8
June
15.7
17.1
14.8
15.4
15.4
July
17.7
19.0
17.0
16.3
18.3
August
17.1
16.8
18.1
17.8
18.6
September
12.0
13.1
11.8
12.0
10.0
October
6.8
6.9
7.0
6.7
4.5
November
1.1
0.9
3.9
2.5
1.7
December
-2.3
-2.0
-1.9
-3.2
-2.9
Average
5.3
-3.5
6.9
6.8
6.5
6.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
18.8
9
18
5
33
10
February
20.7
31
10
25
14
34
March
15.3
12
5
12
28
30
April
5.7
1
5
6
15
May
9.9
8
8
16
10
June
3.0
4
0
6
3
July
3.4
0
1
8
5
August
1.3
2
0
1
2
September
4.7
3
1
10
12
October
5.8
8
3
9
5
November
13.4
16
22
7
7
December
14.2
20
13
17
10
Average
9.8
16.8
6.8
6.9
11.9
11.2
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
9.8
10
8
14
10
8
February
10.4
10
14
10
9
10
March
11.3
11
11
10
12
13
April
10.7
11
12
11
9
May
9.1
10
8
10
9
June
8.3
8
8
8
8
July
8.8
10
10
9
7
August
10.1
11
9
12
8
September
11.1
16
11
9
9
October
10.1
9
9
11
13
November
10.2
11
11
11
10
December
10.7
12
11
14
9
Average
10.0
10.2
10.8
9.9
10.2
9.2
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
282°
242°
138°
275°
161°
February
057°
146°
273°
209°
292°
March
283°
103°
301°
041°
290°
April
087°
091°
007°
332°
May
091°
060°
322°
344°
June
338°
023°
076°
355°
July
079°
298°
356°
099°
August
082°
061°
101°
078°
September
105°
096°
285°
090°
October
032°
283°
301°
103°
November
289°
242°
120°
172°
December
158°
249°
121°
194°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.