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
75.1
70
82
81
81
75
February
75.1
78
70
83
71
80
March
88.4
95
82
90
89
88
April
90.1
85
89
90
94
May
94.0
98
99
99
96
84
June
0
0
0
0
0
July
95.0
94
94
97
97
August
90.6
89
87
87
93
September
84.3
91
88
79
93
October
71.4
78
79
74
61
November
69.8
91
63
64
68
December
67.5
95
49
64
76
Average
86.7
91.0
88.1
87.7
85.8
86.1
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
-8.2
-9.3
-11.0
0.0
-7.4
-12.6
February
-6.1
-2.5
-8.4
-3.0
-7.0
-7.2
March
-1.2
0.4
-1.7
-1.0
1.6
-1.5
April
4.1
1.3
4.9
4.2
4.0
May
9.5
0.0
14.5
11.0
10.6
8.0
June
15.6
0.0
18.6
18.3
18.0
18.6
July
19.0
19.6
18.1
18.3
21.8
August
16.4
18.3
18.1
17.6
15.9
September
11.3
13.8
12.6
10.1
9.6
October
2.3
4.5
-0.0
4.7
2.6
November
-4.6
-1.1
-7.4
-4.2
-5.2
December
-6.3
-4.1
-10.3
-2.3
-8.2
Average
4.0
-2.0
5.6
5.2
5.8
4.2
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
-17.3
-18.3
-21.1
-12.6
-16.0
-18.3
February
-16.3
-11.4
-16.3
-13.1
-17.1
-17.3
March
-12.2
-10.0
-11.4
-15.3
-9.0
-11.6
April
-6.1
-9.0
-5.9
-6.2
-6.2
May
0.2
0.0
2.5
-1.4
0.9
-1.1
June
6.2
0.0
8.0
8.0
8.1
7.4
July
9.2
10.9
8.8
9.6
10.3
August
6.7
8.9
8.0
6.9
5.7
September
2.6
3.2
3.9
2.7
2.0
October
-5.6
-3.0
-9.8
-3.3
-3.2
November
-11.7
-8.2
-15.3
-9.5
-13.3
December
-14.4
-13.8
-19.8
-14.0
-17.6
Average
-5.2
-8.3
-4.2
-5.3
-4.7
-5.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
32.9
36
23
24
18
53
February
28.9
19
32
26
34
36
March
17.0
9
24
16
12
17
April
15.2
25
13
17
11
May
9.5
9
6
7
11
14
June
0
0
0
0
0
July
14.3
16
16
21
6
August
12.4
13
14
7
18
September
13.1
10
16
15
14
October
17.5
16
20
9
34
November
22.2
18
35
21
24
December
38.6
14
68
33
41
Average
15.9
13.2
16.4
16.6
15.0
18.6
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
5.4
6
6
5
7
5
February
5.7
6
6
7
6
6
March
7.7
8
6
7
8
9
April
7.4
7
7
8
9
May
7.7
8
7
9
8
7
June
0
0
0
0
0
July
6.1
5
6
6
8
August
6.4
7
5
7
6
September
6.7
7
7
6
8
October
5.8
7
6
6
7
November
5.1
7
4
5
4
December
5.1
7
4
4
5
Average
6.8
7.6
6.3
6.5
6.9
7.2
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
295°
264°
261°
267°
347°
February
250°
191°
274°
306°
314°
March
267°
351°
317°
283°
269°
April
013°
286°
321°
307°
May
324°
261°
262°
287°
353°
June
360°
360°
360°
360°
360°
July
121°
031°
316°
269°
August
151°
123°
214°
350°
September
225°
256°
035°
243°
October
229°
316°
234°
034°
November
292°
344°
268°
293°
December
265°
238°
331°
322°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.