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
89.4
71
97
98
85
94
February
93.9
83
99
96
94
89
March
93.2
83
99
91
93
88
April
95.1
97
93
92
95
May
98.0
95
100
98
99
June
92.7
86
99
96
96
July
96.1
97
95
99
98
August
91.4
90
93
97
92
September
96.9
99
99
93
99
October
95.8
95
96
95
99
November
89.2
84
90
90
83
December
93.0
94
97
86
89
Average
92.6
79.2
94.2
95.7
93.8
93.7
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
-16.7
-15.9
-17.5
-19.6
-18.0
-18.6
February
-10.3
-10.9
-10.5
-11.9
-11.0
-11.0
March
0.5
-3.2
-1.0
3.2
-1.8
1.3
April
11.1
14.0
9.6
9.5
11.0
May
18.7
16.6
19.3
17.8
17.5
June
21.7
20.1
24.0
23.0
23.6
July
27.0
26.0
27.6
27.1
29.3
August
23.8
24.6
24.8
24.3
24.8
September
19.6
19.8
20.8
19.3
20.1
October
10.9
11.5
12.0
10.0
10.8
November
-4.9
-2.6
-7.7
-2.6
-1.0
December
-15.4
-16.8
-17.6
-16.9
-16.3
Average
5.9
-9.3
7.4
7.6
7.9
7.9
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
-24.0
-23.0
-25.3
-28.1
-28.1
-25.3
February
-19.0
-18.1
-20.3
-19.0
-21.6
-20.6
March
-9.7
-11.0
-10.0
-6.4
-9.9
-7.5
April
0.7
3.3
-0.0
0.8
1.0
May
7.8
6.0
7.7
7.2
7.5
June
12.6
11.5
13.5
13.4
14.0
July
18.3
17.6
18.1
19.1
20.6
August
15.7
16.8
16.6
14.5
15.4
September
9.7
9.8
9.5
9.5
10.0
October
1.3
1.3
2.7
1.1
0.5
November
-11.8
-9.4
-13.3
-9.1
-9.5
December
-22.0
-25.6
-24.6
-22.8
-25.8
Average
-4.9
-18.7
-2.3
-2.4
-2.9
-2.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
18.9
28
22
11
13
19
February
16.9
34
17
6
19
36
March
15.5
27
12
19
13
30
April
9.2
3
17
12
8
May
8.9
11
6
10
11
June
12.6
19
5
11
12
July
5.5
7
8
4
2
August
11.9
10
9
9
9
September
7.7
4
3
14
7
October
8.0
6
9
14
5
November
20.0
21
27
23
26
December
22.8
10
30
51
32
Average
14.2
29.6
11.3
11.8
14.0
15.2
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
7.7
7
7
9
5
9
February
9.3
8
8
10
9
11
March
9.9
10
9
11
11
10
April
11.0
12
11
13
10
May
9.9
12
10
10
10
June
7.8
10
7
7
7
July
7.3
8
9
7
7
August
7.8
8
8
9
8
September
9.2
10
9
10
9
October
10.0
11
10
9
10
November
11.2
10
11
11
8
December
10.3
8
9
14
8
Average
9.1
8.4
9.3
9.4
9.3
8.8
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
321°
260°
245°
243°
246°
February
272°
247°
256°
277°
260°
March
268°
255°
252°
272°
245°
April
244°
297°
259°
261°
May
315°
239°
242°
022°
June
030°
295°
054°
207°
July
351°
266°
036°
237°
August
033°
061°
233°
029°
September
245°
234°
240°
282°
October
245°
257°
259°
251°
November
252°
255°
247°
254°
December
242°
240°
243°
248°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.