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
79.0
82
87
86
81
55
February
81.4
83
65
82
93
79
March
84.2
93
78
77
84
85
April
90.3
90
90
97
99
May
90.2
87
87
94
93
June
92.3
96
92
96
84
July
91.3
83
90
98
88
August
88.7
87
84
90
92
September
88.3
77
83
94
85
October
82.2
74
74
94
85
November
81.2
75
88
82
87
December
73.8
69
66
72
69
Average
86.5
86.7
81.8
84.0
91.2
85.2
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
7.6
6.7
7.7
8.0
8.0
6.4
February
9.2
7.9
10.9
9.9
10.4
8.0
March
11.2
12.6
11.5
10.1
12.0
11.1
April
14.0
13.1
13.0
14.3
12.0
May
17.6
17.8
17.8
17.6
14.5
June
20.8
19.6
23.6
20.5
20.6
July
22.5
21.1
20.1
24.1
22.5
August
21.8
21.8
20.6
24.8
20.0
September
19.2
17.8
22.1
18.8
20.5
October
15.2
15.1
16.3
16.8
15.5
November
10.9
10.6
10.8
12.4
10.3
December
8.8
9.5
9.9
5.0
9.5
Average
14.3
9.1
14.7
15.2
15.7
14.3
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
1.7
0.8
2.1
1.3
1.6
1.3
February
2.9
2.7
5.2
2.9
3.7
2.5
March
3.9
2.5
4.5
4.7
3.9
3.1
April
4.8
6.4
4.2
4.7
1.3
May
8.0
9.5
8.5
8.5
5.9
June
10.8
9.3
12.0
9.6
11.5
July
12.9
12.3
12.1
12.8
13.9
August
12.6
12.4
12.1
13.6
12.3
September
10.5
10.4
13.0
10.3
11.4
October
8.0
7.7
8.8
7.5
8.9
November
4.7
5.0
4.7
5.5
4.0
December
3.8
5.2
5.4
-1.4
5.0
Average
6.5
2.0
7.5
7.5
7.0
6.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
16.3
17
17
24
14
25
February
20.4
23
40
8
18
24
March
16.8
3
30
40
13
11
April
11.5
16
24
8
7
May
12.0
20
11
15
26
June
10.0
11
6
8
14
July
12.0
23
25
3
15
August
12.6
13
22
9
13
September
15.6
27
17
18
10
October
18.8
21
24
19
15
November
18.9
20
29
27
12
December
18.6
16
33
12
20
Average
14.4
13.3
20.8
21.2
12.9
15.3
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
8.7
8
10
10
7
9
February
10.4
9
10
8
13
11
March
10.1
8
10
11
10
10
April
8.7
11
9
9
8
May
7.8
7
8
8
9
June
7.8
7
8
8
7
July
7.6
7
9
7
7
August
7.9
8
8
7
8
September
7.8
8
8
8
8
October
8.5
7
8
9
9
November
8.6
8
9
10
7
December
9.1
9
11
6
10
Average
8.5
8.3
8.4
8.7
8.4
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°
247°
255°
266°
286°
February
143°
235°
288°
242°
145°
March
061°
193°
224°
098°
264°
April
243°
131°
023°
034°
May
213°
026°
243°
219°
June
278°
067°
207°
004°
July
234°
231°
244°
245°
August
235°
234°
036°
243°
September
331°
187°
277°
206°
October
171°
198°
202°
226°
November
063°
265°
209°
298°
December
266°
239°
038°
229°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.