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
89.4
90
94
93
90
73
February
93.0
93
93
95
91
90
March
93.5
97
98
94
88
94
April
93.2
98
85
91
94
May
93.0
96
93
93
91
96
June
89.9
89
94
92
88
88
July
91.6
96
91
95
84
August
91.9
91
88
95
90
September
95.0
91
97
97
89
October
93.5
89
96
96
96
November
91.3
87
87
92
87
December
89.5
80
89
88
97
Average
92.2
93.2
92.4
91.6
92.0
89.8
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
10.3
11.9
12.5
9.5
10.9
8.8
February
13.4
13.9
13.5
12.0
13.3
14.6
March
14.9
14.3
15.8
17.0
14.5
14.0
April
17.3
18.0
17.8
16.0
16.1
May
20.4
20.8
19.0
20.0
23.6
19.1
June
24.3
27.0
22.6
24.6
25.8
23.8
July
25.9
26.1
25.1
28.5
23.5
August
26.3
26.1
26.3
29.3
24.3
September
23.8
20.6
26.6
24.8
23.8
October
20.6
19.8
23.3
24.3
19.8
November
14.5
17.3
15.0
15.6
11.0
December
12.2
11.1
12.8
10.8
14.3
Average
18.5
17.5
18.5
19.2
20.1
17.7
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
1.0
1.8
1.9
1.0
-1.8
1.1
February
2.4
3.1
4.2
-1.8
2.9
3.9
March
4.2
4.0
4.5
5.2
4.2
4.2
April
6.3
5.7
6.7
6.2
5.2
May
10.0
10.1
9.1
10.1
12.0
8.5
June
14.3
15.9
13.8
15.4
15.3
14.0
July
15.9
16.1
15.9
16.3
15.0
August
16.0
16.5
16.1
17.6
14.6
September
12.8
11.5
13.8
12.9
14.0
October
9.6
10.4
11.9
12.0
7.7
November
4.8
6.2
6.2
6.0
4.0
December
3.1
2.6
3.3
2.2
3.3
Average
8.2
7.0
8.5
8.8
9.2
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
25.8
26
12
29
18
41
February
21.4
13
24
8
24
24
March
23.9
21
21
21
26
20
April
21.8
20
27
29
23
May
23.5
14
24
30
18
28
June
17.6
8
15
19
23
19
July
12.9
6
16
6
21
August
13.2
13
18
8
13
September
16.7
21
13
16
27
October
19.7
22
14
8
17
November
29.9
17
34
35
32
December
27.8
29
24
11
29
Average
20.2
15.6
18.1
20.8
18.1
23.8
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
6.0
6
5
6
5
7
February
6.2
5
7
5
7
6
March
6.8
6
6
7
5
6
April
6.2
7
7
7
6
May
6.1
6
6
6
5
7
June
5.3
4
6
5
5
5
July
5.1
5
5
5
5
August
5.0
5
6
6
5
September
5.4
6
5
6
5
October
5.3
5
5
5
5
November
5.8
6
7
6
6
December
6.2
6
6
4
6
Average
5.7
5.4
5.8
5.9
5.5
5.6
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
260°
283°
253°
270°
255°
February
304°
269°
325°
275°
294°
March
313°
312°
277°
322°
291°
April
309°
284°
289°
322°
May
302°
293°
269°
311°
279°
June
348°
292°
260°
305°
304°
July
304°
281°
311°
295°
August
315°
273°
292°
301°
September
293°
307°
277°
265°
October
278°
284°
221°
284°
November
281°
270°
255°
260°
December
272°
260°
313°
245°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.