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
63.1
66
67
51
61
53
February
66.1
59
63
66
63
66
March
79.1
65
71
90
80
April
84.7
76
87
88
89
May
91.0
98
96
94
86
June
95.6
96
97
92
97
July
93.0
89
86
93
99
August
91.6
86
84
93
90
September
85.7
86
77
82
88
October
75.9
76
82
66
71
November
59.1
59
37
40
70
December
57.3
53
54
56
60
Average
81.3
62.2
81.3
80.2
83.0
83.6
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
-3.7
-1.0
-8.9
-1.5
-2.8
-5.9
February
-2.0
-1.3
-3.0
-1.6
-2.7
-5.0
March
1.5
1.8
-1.8
4.0
2.0
April
6.9
5.2
8.8
6.5
7.7
May
14.4
18.6
15.0
13.6
12.5
June
20.0
20.1
21.0
20.1
22.6
July
21.4
21.5
20.0
20.6
24.8
August
20.0
20.6
19.8
21.1
20.3
September
14.4
16.8
16.8
12.0
11.6
October
7.5
9.3
4.4
9.0
9.0
November
2.1
3.0
-2.1
2.2
1.1
December
-2.4
0.1
-6.7
-5.9
-6.7
Average
7.4
-1.1
8.9
8.1
9.0
7.4
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
-9.8
-7.5
-16.5
-5.2
-9.4
-10.5
February
-10.6
-7.5
-9.1
-7.2
-9.6
-15.5
March
-8.9
-5.0
-9.0
-6.4
-7.2
April
-3.1
-3.2
-3.0
-4.2
-3.5
May
1.3
2.9
0.5
1.3
1.3
June
6.4
7.2
2.9
3.3
10.5
July
8.2
9.5
7.2
2.2
10.9
August
7.7
9.6
9.9
1.8
8.1
September
5.1
6.7
7.9
2.0
4.0
October
1.1
2.6
-3.1
2.1
3.5
November
-3.4
-2.5
-7.4
-2.3
-5.5
December
-7.5
-7.7
-11.1
-10.4
-13.6
Average
-2.7
-7.5
-1.9
-2.7
-2.2
-2.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
34.5
26
29
30
38
58
February
32.1
22
26
27
38
50
March
21.8
14
30
12
24
April
15.6
27
8
17
16
May
8.3
2
10
11
13
June
8.1
10
5
8
6
July
8.8
11
13
10
3
August
9.3
8
14
7
15
September
11.5
9
12
7
10
October
16.9
9
16
14
20
November
21.1
21
31
23
19
December
36.0
31
54
38
38
Average
16.2
23.6
13.7
16.4
14.4
18.0
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
6.2
6
7
8
9
5
February
6.7
7
9
7
8
5
March
7.3
6
7
8
8
April
6.6
7
6
7
7
May
6.7
6
8
8
7
June
6.1
6
6
7
6
July
5.5
6
5
6
5
August
5.8
7
6
7
5
September
6.1
7
7
6
7
October
6.5
8
6
7
9
November
5.8
6
5
6
6
December
6.0
8
6
5
6
Average
6.3
6.7
6.6
6.4
6.8
6.3
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
177°
186°
175°
231°
085°
February
194°
168°
232°
186°
240°
March
161°
252°
239°
265°
April
329°
041°
269°
286°
May
276°
242°
257°
351°
June
208°
282°
221°
254°
July
185°
236°
211°
254°
August
192°
146°
187°
130°
September
187°
198°
086°
185°
October
196°
281°
205°
178°
November
233°
082°
143°
203°
December
214°
142°
140°
218°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.