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
96.7
93
100
99
96
94
February
97.6
100
100
96
100
96
March
98.0
94
100
100
99
97
April
97.6
100
100
95
98
May
98.7
100
97
97
99
June
98.6
100
95
99
99
July
99.2
100
95
100
100
August
99.8
99
100
100
100
September
99.5
100
99
100
100
October
98.6
99
97
99
98
November
97.9
99
98
97
97
December
96.7
99
99
97
96
Average
97.8
94.4
99.5
97.9
98.2
97.7
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
27.7
27.3
27.8
28.8
26.3
27.1
February
27.2
27.3
29.6
26.3
28.1
26.3
March
26.9
25.6
29.6
26.8
25.5
26.1
April
23.9
24.3
25.1
21.8
25.8
May
22.2
24.8
21.3
21.0
22.1
June
19.7
19.5
20.5
18.6
19.5
July
19.8
21.3
18.8
19.8
18.1
August
22.7
23.8
22.3
21.8
22.3
September
26.8
26.1
27.3
27.3
26.6
October
27.7
28.1
27.3
29.3
25.6
November
27.9
28.8
28.3
25.1
28.3
December
27.6
29.8
27.8
26.6
25.5
Average
25.2
26.6
26.1
25.0
24.2
24.4
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
16.7
18.0
16.5
16.3
16.6
16.6
February
16.8
18.6
17.3
16.8
16.1
16.8
March
15.3
16.5
16.6
15.1
15.4
14.0
April
11.5
12.0
10.9
11.1
11.3
May
7.7
8.5
8.6
7.2
6.7
June
4.4
4.4
4.7
4.2
5.2
July
3.9
3.1
3.7
5.4
2.7
August
7.1
7.0
6.2
6.9
7.2
September
10.8
11.5
10.3
11.3
11.4
October
13.6
13.0
13.5
15.1
12.3
November
15.0
16.1
16.1
14.0
14.8
December
16.6
17.8
16.8
16.3
15.0
Average
12.2
17.3
12.0
11.6
11.4
11.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
2.9
5
1
1
3
4
February
4.3
1
0
7
2
6
March
2.8
4
0
2
3
3
April
2.9
0
1
12
1
May
0.6
0
1
1
0
June
0.2
0
0
1
0
July
0.2
0
1
0
0
August
0.0
0
0
0
0
September
0.4
2
0
0
0
October
1.3
1
4
1
2
November
2.2
1
2
6
2
December
5.3
4
4
7
4
Average
2.2
4.4
0.7
1.8
2.7
2.0
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
6.7
6
6
6
7
7
February
6.3
7
6
6
6
6
March
6.1
5
6
6
6
6
April
5.8
6
6
7
5
May
5.2
4
6
6
5
June
5.6
6
6
7
6
July
5.9
7
7
5
6
August
7.4
7
7
8
8
September
7.8
9
8
7
8
October
8.0
8
8
8
8
November
7.9
8
7
7
9
December
7.6
8
7
7
8
Average
6.7
6.0
6.8
6.7
6.5
6.9
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
029°
002°
013°
026°
034°
February
072°
320°
042°
020°
066°
March
356°
344°
359°
357°
317°
April
348°
314°
348°
318°
May
331°
333°
333°
292°
June
343°
300°
041°
325°
July
291°
330°
313°
306°
August
323°
339°
316°
334°
September
336°
320°
341°
340°
October
349°
004°
337°
346°
November
341°
343°
343°
327°
December
329°
005°
325°
342°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.