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
59.3
78
65
51
45
52
February
72.3
72
65
75
79
65
March
83.8
80
89
85
85
88
April
88.8
90
76
85
88
May
94.0
96
90
96
99
95
June
93.1
91
92
96
86
July
95.3
97
96
96
89
August
93.7
95
91
93
89
September
91.6
92
96
91
90
October
80.7
64
85
88
84
November
59.4
58
70
70
51
December
56.5
47
66
44
41
Average
83.5
83.1
82.0
84.2
85.4
79.6
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
1.5
3.5
1.9
3.0
1.7
-1.6
February
3.7
2.1
7.2
4.0
4.9
2.7
March
7.8
9.8
10.5
7.0
8.0
6.9
April
11.8
13.0
8.9
9.3
8.1
May
16.4
16.1
17.5
16.6
18.5
12.9
June
22.0
20.5
22.1
24.1
22.5
July
22.9
23.3
23.3
24.3
20.8
August
22.8
25.1
19.3
24.1
19.3
September
18.1
18.6
21.8
16.0
18.6
October
12.9
12.1
14.0
15.0
12.0
November
5.7
5.7
5.5
7.5
4.5
December
2.1
2.1
3.6
-2.1
2.0
Average
12.0
8.0
13.1
12.5
13.1
10.8
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
-3.9
-3.9
-4.6
-1.5
-2.7
-3.5
February
-2.6
-4.1
2.6
-3.6
-1.7
-3.0
March
0.8
-1.7
1.9
0.5
-2.6
0.5
April
3.8
4.2
1.8
1.3
1.3
May
8.0
5.5
8.4
6.5
7.2
7.0
June
13.1
10.0
11.0
10.6
15.3
July
13.4
11.8
12.1
11.0
14.0
August
13.2
13.3
9.6
12.5
12.5
September
9.4
9.9
9.3
7.2
10.9
October
6.6
6.5
6.5
6.9
4.9
November
1.7
0.8
1.3
1.3
1.0
December
-1.0
-2.5
-0.0
-6.5
-2.5
Average
5.0
-1.9
5.3
4.7
4.5
5.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
29.1
21
18
27
29
51
February
19.8
10
21
18
24
31
March
15.2
5
4
25
6
16
April
12.8
16
14
18
21
May
8.6
4
10
4
2
25
June
6.9
6
6
2
9
July
6.8
2
5
4
15
August
7.6
3
10
4
19
September
9.3
13
2
11
7
October
13.1
15
11
7
7
November
17.6
21
28
8
19
December
24.7
26
22
17
20
Average
12.8
8.5
11.4
12.6
9.4
19.0
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
8.9
9
10
10
9
8
February
8.8
6
10
9
12
6
March
8.2
6
7
10
6
8
April
8.0
9
8
9
7
May
7.1
7
7
6
7
10
June
6.5
7
6
6
5
July
6.7
6
8
6
6
August
6.3
6
7
6
7
September
6.3
8
5
6
5
October
7.5
7
8
7
6
November
7.5
8
10
6
7
December
8.3
8
10
6
7
Average
7.3
6.9
7.4
7.9
6.9
6.9
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
214°
235°
228°
245°
234°
February
139°
228°
247°
233°
189°
March
020°
200°
226°
082°
247°
April
227°
008°
006°
303°
May
298°
143°
052°
253°
238°
June
229°
014°
238°
307°
July
233°
233°
281°
234°
August
243°
232°
025°
249°
September
267°
191°
233°
256°
October
190°
218°
209°
198°
November
220°
229°
193°
220°
December
223°
226°
073°
223°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.