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
98.3
98
98
99
98
98
February
98.1
100
97
96
99
100
March
98.2
100
97
98
97
99
April
97.4
98
97
97
100
May
97.9
98
96
98
98
June
98.5
94
98
99
100
July
98.1
96
98
95
100
August
98.7
97
98
98
98
September
97.5
96
99
98
99
October
98.2
98
96
96
98
November
98.0
96
97
98
99
December
98.4
97
97
98
100
Average
98.2
99.1
96.9
97.3
97.5
98.9
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
2021
January
30.5
35.7
33.3
14.0
30.3
28.1
February
31.1
16.1
35.0
30.3
31.6
30.6
March
30.4
29.3
33.7
29.8
27.0
29.8
April
25.7
26.1
27.1
23.3
29.3
May
22.4
26.8
22.0
22.3
22.8
June
20.6
19.8
19.6
19.0
21.3
July
20.3
19.6
20.1
20.5
18.8
August
22.8
24.8
23.8
22.3
21.5
September
27.3
25.5
26.3
28.0
27.8
October
30.0
30.1
30.6
31.1
27.3
November
31.7
32.5
33.8
29.3
30.3
December
31.8
35.7
33.7
19.1
28.8
Average
27.4
30.2
28.6
26.0
25.4
26.3
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
15.8
19.1
17.3
6.2
16.1
16.3
February
15.9
6.7
14.0
16.1
16.1
15.6
March
14.2
16.5
15.0
13.3
13.6
12.9
April
9.4
10.0
8.3
8.3
9.5
May
4.3
8.1
5.5
4.9
4.5
June
2.2
3.3
2.7
2.2
3.3
July
1.7
0.3
1.9
3.3
-1.6
August
3.3
3.6
4.4
3.2
2.7
September
7.7
7.0
6.0
8.9
8.5
October
11.5
10.5
11.3
14.9
9.5
November
13.6
14.0
15.3
12.6
11.0
December
15.4
17.3
16.3
8.5
13.5
Average
10.2
16.3
10.0
8.9
9.3
8.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
2.4
2
0
1
2
6
February
2.1
2
1
4
1
5
March
1.5
0
1
2
7
3
April
1.6
2
1
3
0
May
0.8
0
2
3
0
June
0.4
0
0
3
0
July
0.2
0
0
0
0
August
0.4
0
0
0
3
September
0.3
1
0
1
0
October
0.7
0
1
0
2
November
1.0
1
1
3
0
December
1.7
1
2
1
3
Average
1.2
1.2
0.5
1.1
1.9
1.9
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
7.5
8
7
4
6
6
February
7.0
8
7
6
6
7
March
7.3
7
7
8
6
7
April
6.1
8
6
6
5
May
5.6
6
6
5
6
June
6.8
8
7
6
8
July
7.2
7
8
8
8
August
7.6
8
7
8
8
September
8.2
8
8
9
9
October
8.3
8
8
9
9
November
8.6
10
8
8
8
December
8.6
9
10
6
9
Average
7.5
7.7
7.8
7.2
6.9
7.7
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
342°
333°
004°
006°
015°
February
350°
301°
358°
334°
341°
March
350°
339°
353°
354°
323°
April
354°
326°
360°
317°
May
344°
348°
327°
323°
June
350°
315°
005°
335°
July
309°
327°
349°
334°
August
326°
346°
328°
324°
September
320°
278°
332°
340°
October
299°
310°
341°
319°
November
321°
325°
347°
283°
December
312°
333°
348°
350°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.