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
69.1
70
77
83
57
63
February
80.2
80
68
75
85
84
March
88.1
89
91
86
91
90
April
93.4
94
91
96
94
May
95.0
95
94
97
94
June
94.4
95
96
96
92
July
95.3
95
94
97
97
August
96.0
98
94
95
93
September
92.8
95
96
92
91
October
85.2
80
78
91
94
November
71.7
64
79
76
70
December
63.6
54
54
75
54
Average
87.3
80.8
87.1
87.3
90.1
87.4
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
5.1
4.5
4.7
6.7
6.7
3.7
February
6.6
5.4
8.8
7.0
8.1
5.5
March
9.9
12.0
11.5
9.1
10.6
9.8
April
13.4
14.0
12.3
12.4
10.8
May
18.2
21.1
18.0
18.5
14.8
June
22.7
20.3
24.5
22.6
24.0
July
22.7
22.8
21.8
23.5
23.8
August
23.5
23.6
21.6
26.1
20.5
September
19.6
21.0
23.0
18.1
19.3
October
14.8
14.6
14.4
16.6
14.5
November
8.7
8.3
8.0
9.0
8.9
December
5.8
6.9
6.0
2.1
5.0
Average
13.6
7.3
14.8
14.4
15.0
13.4
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
0.9
0.1
0.3
2.9
3.0
-1.8
February
0.8
-1.4
4.2
1.3
2.2
-2.9
March
1.7
0.7
4.2
2.6
0.1
0.5
April
3.9
5.7
3.2
3.1
1.7
May
8.0
11.0
7.2
7.7
7.0
June
12.1
11.5
11.1
10.9
13.0
July
13.1
13.3
13.4
12.4
15.0
August
13.4
13.6
12.9
13.8
12.5
September
10.6
11.6
12.0
9.8
11.4
October
8.1
7.4
8.5
9.0
7.4
November
4.0
4.0
3.6
4.2
4.7
December
2.0
3.3
2.7
-3.1
0.6
Average
5.9
0.0
7.5
6.8
6.4
6.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
31.7
25
34
30
38
38
February
24.1
7
31
22
40
15
March
17.5
5
15
30
5
19
April
15.6
28
15
18
16
May
13.1
12
7
14
31
June
11.7
20
7
10
10
July
16.4
22
29
10
12
August
13.9
9
23
3
27
September
14.4
10
5
27
10
October
22.4
21
37
12
20
November
23.7
25
34
13
33
December
29.8
29
49
17
31
Average
17.5
11.3
20.0
21.6
15.5
20.6
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
9.7
9
11
11
11
9
February
9.9
7
10
9
13
9
March
9.6
8
9
10
8
9
April
9.5
9
10
10
10
May
8.7
8
9
8
9
June
8.0
8
7
8
7
July
8.3
8
9
9
8
August
7.6
8
7
7
8
September
8.0
9
8
8
7
October
9.0
8
9
8
9
November
8.8
8
9
10
9
December
8.9
9
10
6
8
Average
8.7
8.1
8.6
8.8
8.7
8.3
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
226°
239°
229°
263°
231°
February
116°
234°
266°
236°
119°
March
265°
152°
244°
109°
256°
April
228°
072°
332°
305°
May
084°
027°
269°
246°
June
259°
341°
272°
300°
July
244°
234°
280°
259°
August
230°
254°
329°
263°
September
137°
194°
203°
248°
October
179°
217°
211°
202°
November
218°
219°
171°
235°
December
225°
236°
125°
212°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.