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
86.5
0
94
97
96
100
February
86.6
0
96
99
100
94
March
97.2
97
98
98
100
April
98.0
100
100
97
99
May
97.9
99
99
99
97
June
98.9
97
100
99
100
July
99.5
100
99
100
100
August
99.8
100
100
100
100
September
99.2
97
100
99
100
October
98.3
95
99
97
99
November
98.5
97
97
99
99
December
96.4
86
97
98
96
Average
87.4
96.9
98.7
98.6
98.7
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
12.4
12.4
13.0
12.5
13.4
11.1
February
13.1
13.6
14.0
11.5
14.5
13.1
March
14.9
14.8
15.1
14.1
16.6
April
17.4
18.5
16.8
17.1
15.9
May
20.8
20.1
21.3
22.8
19.1
June
25.7
23.6
26.5
27.1
26.0
July
28.5
28.6
30.3
30.3
27.3
August
29.6
31.1
28.6
29.8
28.6
September
25.9
24.8
27.1
26.0
26.5
October
21.4
20.8
22.1
22.3
21.5
November
16.6
17.6
16.6
17.6
15.4
December
13.4
14.6
14.0
12.1
13.1
Average
19.2
13.0
20.2
20.2
20.9
19.7
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
7.6
7.0
8.5
8.6
8.4
6.2
February
8.2
8.6
9.3
7.5
9.0
8.5
March
9.1
9.9
9.4
8.9
9.9
April
11.4
12.0
11.5
11.5
10.0
May
15.0
14.6
15.6
18.0
14.0
June
20.1
19.3
21.6
22.0
20.8
July
22.6
23.6
24.1
25.1
22.0
August
23.1
24.3
22.6
24.5
22.5
September
19.5
18.3
21.1
20.5
20.0
October
16.1
16.6
17.5
17.3
15.3
November
11.6
12.8
11.5
12.9
11.0
December
8.7
9.4
9.4
8.9
8.6
Average
13.7
7.7
14.9
15.1
15.8
14.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
4.4
0
4
5
4
18
February
5.3
0
13
1
5
3
March
6.8
15
2
3
0
April
5.9
5
2
5
7
May
5.7
7
7
5
7
June
2.0
3
3
2
0
July
0.6
0
0
0
1
August
0.7
1
1
2
1
September
2.1
6
1
3
1
October
6.5
14
8
2
2
November
8.6
4
8
4
14
December
8.2
0
8
10
8
Average
4.0
5.7
3.5
3.3
4.5
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
9.2
12
8
8
9
10
February
9.5
9
9
9
10
10
March
9.5
8
8
13
9
April
9.4
11
7
11
10
May
8.2
9
8
9
8
June
8.1
10
8
10
9
July
7.4
7
7
9
9
August
7.6
6
8
8
10
September
8.4
9
8
7
9
October
9.0
10
8
5
10
November
8.9
9
8
7
13
December
8.1
9
8
7
7
Average
8.7
10.3
8.6
8.1
8.7
9.4
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
348°
004°
006°
317°
011°
February
005°
341°
013°
007°
358°
March
256°
234°
030°
025°
April
358°
004°
014°
018°
May
002°
005°
023°
006°
June
340°
014°
032°
029°
July
204°
026°
196°
059°
August
016°
355°
215°
036°
September
352°
018°
003°
057°
October
349°
283°
009°
024°
November
008°
325°
010°
004°
December
011°
333°
009°
331°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.