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
62.8
61
70
52
74
55
February
70.9
64
61
78
88
60
March
79.4
69
80
87
82
April
91.2
85
88
95
97
May
93.6
99
97
96
88
June
94.0
95
98
95
91
July
95.2
95
92
96
96
August
92.2
91
87
94
98
September
86.2
77
81
90
85
October
75.6
67
87
67
75
November
63.0
61
72
53
78
December
60.1
65
71
83
69
Average
82.4
62.3
82.2
85.4
88.2
85.1
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
-2.9
-5.5
-1.0
1.0
-6.9
February
0.0
-1.9
-1.4
2.2
1.5
-3.2
March
3.7
3.2
1.7
6.5
5.5
April
9.5
8.3
8.5
10.0
8.8
May
15.9
20.6
16.1
14.5
13.4
June
20.6
18.6
23.3
20.6
21.3
July
21.1
19.6
19.3
20.8
23.1
August
19.5
19.1
18.3
21.3
19.3
September
15.2
16.0
17.1
14.0
16.1
October
9.0
10.5
7.4
9.5
10.6
November
3.0
3.7
-1.3
4.5
3.7
December
-2.8
1.7
-4.0
-6.7
-3.5
Average
8.5
-1.3
9.7
9.0
10.5
9.3
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
-8.9
-7.0
-14.9
-6.2
-6.5
-11.5
February
-7.7
-8.5
-7.9
-6.4
-6.9
-9.0
March
-5.7
-2.1
-8.5
-4.0
-3.5
April
-1.3
-1.5
-1.0
-2.8
-2.7
May
5.2
8.0
3.7
5.0
4.5
June
10.6
9.4
11.4
10.9
11.3
July
11.9
11.9
11.4
11.5
13.5
August
10.6
10.6
11.6
11.0
10.0
September
7.5
7.2
9.4
7.2
7.4
October
2.8
3.3
1.1
3.2
4.5
November
-2.4
-2.0
-5.7
1.1
-3.9
December
-6.0
-4.2
-10.5
-10.0
-8.2
Average
0.9
-8.7
1.9
1.3
2.4
1.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
26.9
33
27
34
11
27
February
20.8
15
34
10
11
18
March
16.5
27
15
4
13
April
11.9
15
24
8
7
May
13.1
4
5
14
26
June
11.0
14
6
10
8
July
12.9
20
19
10
12
August
12.9
16
25
5
5
September
15.7
16
19
13
10
October
19.4
15
17
22
22
November
28.1
8
38
45
16
December
32.7
15
33
30
26
Average
17.0
22.9
16.7
17.9
12.5
14.4
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
5.3
6
6
5
6
5
February
6.0
5
6
5
7
6
March
6.4
6
6
5
7
April
6.8
7
6
7
9
May
6.7
6
7
8
7
June
6.8
8
6
7
7
July
6.4
7
6
7
6
August
6.8
8
6
7
7
September
6.5
5
7
6
5
October
6.6
6
7
7
8
November
5.9
5
7
6
6
December
4.5
5
5
4
4
Average
6.3
5.4
6.4
6.0
6.6
6.7
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
014°
001°
191°
250°
027°
February
168°
164°
335°
189°
023°
March
062°
017°
220°
198°
April
022°
026°
005°
348°
May
138°
246°
185°
027°
June
179°
150°
186°
179°
July
168°
188°
204°
117°
August
185°
098°
177°
013°
September
162°
198°
061°
138°
October
184°
017°
196°
184°
November
271°
020°
089°
171°
December
191°
026°
013°
012°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.