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
99.1
100
97
100
98
99
February
99.7
100
100
100
100
100
March
99.6
100
99
100
100
100
April
99.8
100
100
100
100
May
98.7
99
99
96
98
99
June
97.5
97
100
93
96
97
July
95.9
95
95
96
97
August
98.1
97
98
98
98
September
99.1
99
99
98
99
October
99.0
99
100
99
99
November
99.7
100
100
99
100
December
99.6
100
99
100
100
Average
98.9
99.3
98.6
98.3
98.5
99.0
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
28.0
28.3
27.1
28.1
27.1
26.8
February
26.8
28.8
27.6
27.3
26.6
25.5
March
25.6
28.3
27.6
23.1
25.5
24.1
April
21.9
19.6
21.1
22.6
21.8
May
18.2
19.3
19.3
17.1
18.3
18.6
June
15.6
16.0
15.0
16.3
15.0
16.1
July
15.1
15.1
15.0
14.3
14.6
August
15.9
18.0
16.5
15.4
16.1
September
18.4
18.3
20.6
16.1
18.6
October
21.3
22.6
20.3
19.3
20.3
November
23.8
24.8
22.6
21.6
22.3
December
25.9
27.0
24.1
25.1
25.3
Average
21.6
24.0
21.8
21.0
20.4
20.8
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
17.9
17.6
17.5
17.3
19.0
17.1
February
17.3
18.1
16.8
17.0
17.1
16.3
March
16.1
17.1
17.1
15.4
16.0
14.1
April
13.0
10.0
12.9
14.3
11.9
May
10.0
9.0
8.3
10.1
10.6
10.3
June
8.5
8.3
8.5
10.9
10.0
9.5
July
8.1
8.0
8.0
7.2
8.5
August
9.0
10.5
9.0
9.5
8.9
September
10.0
9.8
10.4
9.5
10.1
October
12.3
12.5
11.1
13.0
10.8
November
14.3
15.3
12.9
13.6
13.8
December
15.9
16.3
15.4
15.1
15.0
Average
12.8
14.0
12.5
12.5
12.8
12.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.4
1
5
4
7
2
February
3.2
0
0
4
4
4
March
3.0
0
1
5
4
3
April
5.7
4
5
3
1
May
10.9
7
3
12
6
3
June
11.4
8
8
20
15
7
July
16.5
14
12
8
8
August
15.1
9
5
13
5
September
10.7
7
3
11
9
October
8.1
2
4
11
3
November
7.5
3
4
11
6
December
4.7
2
11
3
1
Average
7.8
2.9
4.7
7.1
7.9
4.1
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
12.2
12
11
12
12
13
February
12.0
12
12
12
12
12
March
11.2
12
11
11
12
11
April
10.4
11
11
10
10
May
10.1
10
9
10
10
10
June
10.6
12
9
13
12
11
July
11.3
11
11
10
13
August
11.7
12
10
12
11
September
12.0
12
11
12
12
October
11.8
12
13
12
12
November
12.4
12
12
13
12
December
12.7
13
13
13
13
Average
11.6
11.8
11.3
11.6
11.8
11.6
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
198°
206°
193°
196°
204°
February
200°
214°
221°
190°
218°
March
190°
208°
226°
198°
209°
April
212°
268°
166°
245°
May
298°
218°
269°
282°
281°
June
313°
337°
335°
307°
326°
July
331°
323°
326°
328°
August
325°
301°
307°
313°
September
265°
283°
248°
270°
October
240°
237°
257°
243°
November
235°
193°
240°
205°
December
225°
194°
195°
209°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.