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
82.6
86
86
93
87
83
February
90.1
97
86
91
96
93
March
91.7
98
95
95
95
80
April
95.9
97
94
99
99
May
98.5
99
98
99
100
99
June
97.4
98
100
99
94
96
July
96.7
91
97
99
98
August
97.0
98
97
97
97
September
97.8
99
98
99
97
October
95.8
96
96
94
97
November
90.5
94
86
85
81
December
91.3
99
85
99
99
Average
94.2
95.8
95.1
94.4
95.4
93.4
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
-4.3
-3.9
-4.1
-3.5
-4.2
-6.5
February
0.0
-2.1
-2.9
2.5
-1.0
1.6
March
9.6
9.9
8.4
12.0
8.5
10.6
April
17.8
19.3
16.5
19.3
17.6
May
24.0
23.3
24.3
24.8
23.8
22.3
June
27.8
28.6
29.1
29.0
25.6
26.3
July
30.1
29.3
29.8
29.3
30.5
August
28.6
30.8
28.8
27.8
27.6
September
24.7
24.0
26.6
24.8
24.5
October
16.8
17.5
19.1
15.5
16.5
November
6.3
9.0
3.6
7.7
5.0
December
-3.7
-1.4
-4.1
-4.3
-1.7
Average
14.7
11.7
15.5
15.5
15.1
14.8
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
-17.8
-16.6
-17.3
-15.3
-17.5
-19.6
February
-13.8
-14.0
-13.8
-10.0
-15.0
-11.4
March
-3.6
-2.1
-3.2
-2.9
-3.6
-2.1
April
5.2
7.5
4.7
5.7
4.7
May
12.0
11.4
12.5
12.3
10.9
11.3
June
17.6
18.1
18.0
17.5
18.1
16.8
July
21.7
22.0
21.6
21.5
22.3
August
19.7
21.8
20.1
18.1
18.6
September
13.2
13.3
13.6
13.4
14.6
October
4.0
4.7
6.5
3.9
4.0
November
-5.5
-2.5
-7.7
-3.5
-6.9
December
-14.0
-14.4
-16.1
-15.1
-12.8
Average
3.4
-1.8
4.4
4.1
4.0
3.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
5.6
8
4
7
5
7
February
4.8
0
1
3
4
5
March
4.4
0
5
1
9
6
April
5.5
4
12
0
10
May
7.6
7
10
6
4
8
June
6.9
13
2
2
16
12
July
9.1
21
12
13
9
August
10.0
5
11
14
7
September
6.9
8
1
7
12
October
5.4
5
5
13
9
November
9.4
10
18
8
18
December
3.4
0
14
2
1
Average
6.6
5.9
6.5
7.3
8.3
8.7
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
5.9
5
6
8
6
6
February
7.0
7
8
8
7
8
March
8.6
10
8
9
9
8
April
9.8
9
10
10
10
May
9.2
9
9
9
9
9
June
7.0
7
8
7
6
6
July
5.9
6
6
5
6
August
5.5
5
6
5
5
September
6.1
6
6
7
6
October
7.2
8
7
8
7
November
6.9
6
7
7
6
December
6.3
6
7
7
7
Average
7.2
7.8
7.1
7.4
7.1
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
275°
335°
266°
327°
284°
February
245°
013°
270°
286°
273°
March
281°
285°
233°
277°
239°
April
239°
259°
240°
248°
May
232°
233°
196°
231°
233°
June
233°
225°
226°
199°
213°
July
200°
210°
216°
199°
August
208°
014°
225°
234°
September
007°
226°
221°
196°
October
251°
248°
251°
304°
November
275°
283°
274°
251°
December
266°
356°
262°
282°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.