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
87.8
86
94
94
92
76
February
93.1
89
87
98
98
90
March
92.0
95
84
89
89
91
April
94.5
98
94
97
98
May
95.3
97
90
97
96
95
June
94.8
98
98
94
96
July
96.3
94
95
97
94
August
96.2
97
94
99
96
September
91.0
78
85
96
95
October
93.4
85
89
91
96
November
86.9
86
86
87
92
December
84.7
81
86
76
76
Average
92.9
92.5
90.2
92.6
93.9
92.5
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
7.4
6.2
7.7
8.0
7.7
6.0
February
9.0
8.0
10.6
9.6
10.0
8.1
March
10.7
12.5
10.9
9.6
11.9
10.5
April
13.1
12.9
12.4
13.5
11.5
May
17.0
18.6
17.8
17.1
16.8
13.9
June
19.5
17.6
22.1
19.1
19.8
July
21.1
19.8
19.5
22.3
22.1
August
20.7
20.6
19.6
23.3
19.3
September
18.1
16.8
20.6
18.1
20.1
October
14.4
14.4
15.0
15.6
15.0
November
10.3
9.9
9.9
11.4
10.5
December
8.2
9.3
9.3
4.5
8.8
Average
13.9
11.4
14.1
14.4
14.9
13.8
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
1.4
-1.9
1.5
2.2
0.7
0.0
February
2.5
2.5
4.0
2.7
3.7
2.0
March
2.9
2.2
4.2
3.6
2.2
3.2
April
4.0
5.5
4.2
3.3
1.0
May
6.7
7.0
9.8
7.7
3.0
5.5
June
9.7
9.5
11.5
3.2
10.0
July
10.9
10.9
11.4
4.0
13.0
August
10.8
11.3
11.3
4.7
11.8
September
9.3
9.0
10.6
8.0
11.0
October
7.4
7.2
8.3
7.2
8.9
November
4.1
4.2
3.5
5.0
4.2
December
2.9
4.7
4.2
-2.5
4.0
Average
5.7
2.9
6.8
6.8
3.8
6.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
19.1
15
22
24
15
17
February
21.0
20
26
6
24
24
March
17.1
4
25
38
12
10
April
14.3
21
22
8
8
May
14.5
10
18
11
21
31
June
13.5
9
11
17
7
July
15.0
17
27
14
12
August
13.0
11
20
11
10
September
19.0
30
26
21
13
October
22.2
23
31
19
19
November
21.6
20
31
29
11
December
21.9
21
31
12
26
Average
16.5
11.4
19.3
22.3
16.5
15.0
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
8.9
8
9
10
8
9
February
11.0
10
10
9
14
10
March
9.9
8
10
10
9
10
April
8.7
11
9
9
7
May
8.0
8
7
8
9
9
June
8.2
8
8
8
7
July
8.1
8
10
8
6
August
8.7
10
9
7
7
September
8.3
7
8
8
7
October
9.1
8
7
10
10
November
8.6
7
9
9
8
December
9.3
10
11
6
10
Average
8.7
8.1
8.7
8.9
8.8
8.1
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
224°
224°
243°
250°
268°
February
157°
223°
251°
238°
160°
March
246°
167°
211°
127°
251°
April
234°
146°
065°
016°
May
293°
237°
004°
235°
216°
June
262°
112°
217°
304°
July
240°
227°
274°
292°
August
220°
240°
262°
247°
September
320°
186°
283°
210°
October
180°
179°
201°
213°
November
198°
251°
192°
262°
December
250°
230°
173°
218°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.