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
97.6
97
98
99
96
99
February
99.5
99
100
99
99
100
March
99.2
100
99
100
99
100
April
99.6
99
100
100
100
May
99.9
100
100
100
100
June
99.9
100
100
100
100
July
99.9
100
100
100
100
August
99.9
100
100
100
100
September
99.8
99
100
100
100
October
99.4
100
100
99
100
November
98.9
98
97
99
99
December
98.0
95
99
98
99
Average
99.3
98.7
98.9
99.4
99.1
99.7
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
15.6
17.5
16.5
17.5
13.3
16.3
February
16.3
14.5
17.8
15.0
16.3
17.8
March
18.2
19.6
19.6
18.6
14.4
17.5
April
21.6
24.3
20.3
21.8
21.6
May
25.8
26.0
24.1
26.1
27.1
June
29.5
32.7
28.5
29.6
29.6
July
33.3
34.2
36.0
33.5
34.2
August
32.4
33.2
31.3
31.3
35.0
September
30.3
29.8
31.5
30.0
30.1
October
26.3
26.6
27.1
26.1
25.6
November
21.6
21.3
22.3
21.5
22.5
December
17.5
17.0
18.6
19.3
16.1
Average
23.3
17.3
24.9
24.3
23.8
24.5
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
6.8
8.5
9.0
7.0
5.4
7.0
February
6.7
5.0
7.2
4.9
6.5
7.0
March
7.6
7.7
8.4
8.5
4.5
6.4
April
10.3
12.1
9.5
9.8
9.8
May
14.4
15.0
14.0
14.5
14.5
June
18.8
21.3
18.3
19.8
18.3
July
21.9
23.3
22.6
21.3
22.5
August
22.1
22.8
22.0
22.3
22.8
September
19.1
19.3
19.6
19.0
18.6
October
14.5
14.1
15.5
14.6
14.4
November
10.6
9.9
12.4
10.5
11.5
December
8.9
9.6
9.8
11.0
8.5
Average
12.8
7.2
14.4
13.7
13.4
13.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
11.5
13
16
9
14
9
February
5.2
6
1
2
10
1
March
4.5
3
3
6
8
3
April
2.1
1
4
1
0
May
1.0
1
2
1
0
June
0.4
0
1
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.3
1
0
0
0
October
1.3
0
1
0
2
November
5.8
5
9
9
2
December
11.3
22
11
10
14
Average
3.6
7.0
3.6
3.4
3.6
2.1
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
8.4
6
9
7
9
8
February
8.6
10
7
9
10
9
March
8.4
8
8
8
10
9
April
8.4
9
9
8
9
May
8.6
9
8
9
9
June
8.9
9
9
9
10
July
9.5
9
11
10
10
August
8.9
8
9
9
10
September
8.8
9
8
9
10
October
7.5
8
7
8
8
November
7.2
8
9
7
7
December
7.0
8
6
6
8
Average
8.4
8.0
8.4
8.4
8.8
8.9
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
031°
003°
143°
017°
133°
February
356°
194°
350°
014°
347°
March
233°
239°
239°
337°
274°
April
206°
221°
219°
246°
May
230°
224°
209°
229°
June
198°
212°
215°
234°
July
206°
258°
211°
225°
August
207°
217°
213°
248°
September
228°
207°
230°
255°
October
233°
218°
245°
243°
November
350°
204°
133°
157°
December
062°
045°
120°
071°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.