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
January
72.0
76
57
72
85
February
73.9
73
78
65
82
March
72.9
80
70
66
77
April
71.9
89
63
63
May
69.9
75
85
72
50
June
69.2
77
65
66
July
75.7
79
70
78
August
79.4
88
75
76
September
81.4
86
86
72
October
72.8
69
76
75
November
76.3
85
78
66
December
76.4
77
79
72
Average
74.5
75.8
77.6
72.4
71.9
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
January
19.2
19.6
19.3
19.0
18.8
February
19.6
19.1
20.6
19.1
19.8
March
19.1
20.1
19.1
19.1
18.6
April
16.9
17.6
17.3
15.9
May
15.5
15.8
14.6
16.8
14.6
June
15.4
15.4
16.1
14.6
July
14.3
14.0
15.5
13.5
August
14.9
14.4
16.5
14.5
September
14.9
15.4
15.6
14.0
October
15.8
16.3
15.5
15.5
November
17.3
18.1
16.8
17.0
December
18.5
18.3
18.3
19.1
Average
16.7
18.7
16.9
17.2
16.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
January
12.1
12.0
12.5
12.5
11.0
February
11.7
10.3
12.8
11.3
11.5
March
10.2
9.9
9.5
11.1
9.5
April
8.6
7.9
9.5
8.0
May
6.6
7.5
4.7
7.7
6.5
June
7.4
8.0
7.5
6.5
July
5.3
3.1
7.5
5.0
August
6.3
5.7
7.7
5.7
September
6.5
5.2
7.7
6.7
October
7.9
8.9
7.7
7.2
November
8.9
7.9
8.5
10.4
December
10.3
10.3
10.0
10.5
Average
9.9
9.9
8.0
9.1
8.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
January
0.4
0
1
1
0
February
0.6
0
2
0
0
March
1.2
1
1
2
0
April
1.8
2
1
3
May
3.8
8
6
1
2
June
8.1
8
9
8
July
5.0
0
4
10
August
5.9
4
9
5
September
3.3
2
4
4
October
3.4
5
4
2
November
2.9
0
5
3
December
0.8
1
1
0
Average
2.0
1.4
2.5
3.1
3.2
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
January
7.9
8
8
8
9
February
7.3
7
7
7
8
March
7.0
7
7
7
7
April
6.2
6
6
7
May
5.2
5
5
5
5
June
4.8
5
4
5
July
5.1
5
5
5
August
6.0
6
6
6
September
6.8
7
6
7
October
7.5
7
7
8
November
8.0
9
8
8
December
8.1
8
8
8
Average
6.7
7.1
6.8
6.6
6.8
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
January
270°
270°
271°
256°
February
281°
273°
280°
267°
March
257°
262°
270°
258°
April
261°
269°
263°
May
219°
243°
256°
254°
June
351°
255°
294°
July
224°
248°
307°
August
253°
260°
240°
September
251°
247°
251°
October
264°
256°
249°
November
248°
251°
275°
December
261°
263°
272°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.