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
94.0
97
100
94
87
100
February
93.1
91
97
92
98
98
March
93.4
94
96
99
96
94
April
97.1
99
100
99
100
May
96.4
99
99
100
88
100
June
99.7
100
100
100
100
100
July
96.6
96
97
87
99
August
98.1
92
100
100
100
September
99.8
100
100
100
100
October
99.8
99
100
100
100
November
97.0
99
98
98
99
December
96.9
98
99
98
97
Average
96.8
96.1
97.6
98.4
95.6
98.8
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
15.7
15.4
19.1
12.6
14.5
17.8
February
17.3
14.9
17.8
17.8
18.3
20.1
March
21.7
21.0
20.6
21.3
24.8
26.6
April
26.8
25.0
26.6
30.0
30.5
May
33.3
36.6
31.1
33.5
34.2
34.0
June
39.0
37.7
38.3
38.6
39.3
40.1
July
39.9
41.7
40.7
38.8
39.2
August
38.6
40.3
38.7
37.0
38.1
September
35.9
36.2
37.2
35.7
36.1
October
30.1
29.8
31.5
30.5
30.8
November
22.2
24.8
22.8
23.0
23.1
December
17.8
17.6
20.1
17.5
18.3
Average
27.9
24.4
28.5
28.5
29.0
29.6
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
-1.9
1.7
1.9
2.2
-1.4
February
2.9
2.6
1.6
4.5
2.5
3.2
March
6.1
6.5
6.2
5.5
5.7
7.4
April
10.4
11.1
8.4
11.1
11.8
May
15.5
17.8
14.6
14.6
16.5
16.1
June
20.1
19.3
21.0
19.6
21.3
20.6
July
22.7
23.8
22.5
23.3
22.5
August
22.0
24.0
21.3
20.8
22.1
September
17.9
17.8
19.3
17.8
17.3
October
12.6
13.3
13.8
12.4
13.0
November
6.9
8.5
7.5
8.4
7.2
December
2.5
1.8
2.7
3.7
3.1
Average
11.4
8.6
12.1
11.8
12.5
12.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.9
1
0
7
9
0
February
5.2
8
4
5
2
1
March
2.9
5
4
2
0
0
April
0.9
2
1
0
0
May
0.3
0
2
0
0
0
June
0.0
0
0
0
0
0
July
0.1
0
0
1
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.1
1
0
0
0
November
1.9
1
1
1
0
December
1.8
1
0
2
2
Average
1.4
2.7
1.1
1.1
0.9
0.2
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
4.4
5
5
3
5
4
February
5.2
5
7
5
5
4
March
5.9
6
7
5
7
8
April
5.9
6
5
7
6
May
6.8
8
6
6
9
6
June
6.4
8
8
6
7
7
July
6.3
7
6
7
6
August
6.1
7
7
6
7
September
5.3
7
6
5
5
October
4.8
6
6
5
5
November
4.0
5
4
4
4
December
3.6
4
4
3
4
Average
5.6
6.4
6.3
5.3
6.2
5.7
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
246°
208°
244°
181°
206°
February
182°
225°
197°
190°
190°
March
224°
218°
218°
210°
257°
April
248°
217°
235°
244°
May
239°
248°
259°
308°
263°
June
205°
247°
213°
260°
230°
July
225°
211°
210°
187°
August
236°
302°
019°
204°
September
228°
216°
197°
213°
October
234°
228°
185°
196°
November
231°
210°
220°
207°
December
228°
214°
217°
177°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.