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
12.9
15
13
28
13
4
February
37.2
47
40
58
50
30
March
48.5
60
61
50
64
40
April
46.9
55
58
65
39
May
39.9
46
57
46
32
June
33.1
33
45
57
39
July
19.4
9
17
30
31
August
15.1
4
19
20
35
September
25.1
11
39
37
11
October
26.8
18
39
25
35
November
7.1
1
1
31
3
December
9.1
3
19
39
7
Average
28.5
40.6
25.1
35.9
39.9
26.0
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
21.6
21.8
21.1
20.8
19.5
22.1
February
26.5
26.6
25.1
29.0
25.8
28.1
March
31.7
32.1
31.1
30.6
34.6
33.5
April
37.7
36.5
34.6
40.1
37.6
May
39.7
41.8
36.7
41.1
36.3
June
38.4
39.2
35.5
38.6
37.6
July
34.1
34.1
33.2
32.8
34.6
August
32.0
30.3
32.8
31.1
33.0
September
33.0
31.8
33.7
33.6
31.1
October
33.5
34.2
33.7
32.0
32.1
November
28.4
29.3
28.0
29.1
27.8
December
23.4
21.8
24.1
26.6
22.1
Average
31.1
26.8
31.4
31.1
32.2
31.3
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
9.4
9.3
8.9
8.9
8.8
9.8
February
13.3
13.5
13.3
14.9
12.6
13.5
March
18.4
18.3
19.1
19.3
17.6
20.3
April
24.5
24.3
22.8
26.5
23.6
May
26.9
30.0
24.3
29.6
24.6
June
27.7
29.8
27.1
29.1
27.8
July
26.1
25.6
25.6
26.3
26.6
August
24.9
24.6
26.3
25.3
25.1
September
24.6
25.0
25.6
25.1
22.8
October
21.8
23.5
22.6
20.8
20.6
November
15.7
15.5
16.3
15.5
14.5
December
10.6
9.9
11.9
11.5
9.5
Average
19.6
13.7
20.8
20.5
21.0
19.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.6
1
0
1
2
1
February
0.1
0
1
0
0
0
March
0.4
0
0
1
0
0
April
0.2
0
1
0
0
May
0.8
0
1
0
5
June
2.5
2
8
4
2
July
6.3
10
8
8
6
August
9.2
28
3
10
4
September
4.6
6
5
4
3
October
0.3
0
0
2
1
November
0.2
0
1
0
1
December
0.1
0
0
0
1
Average
2.1
0.5
4.3
2.3
2.7
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
4.1
5
4
4
4
4
February
4.8
5
5
5
5
4
March
5.3
6
5
5
6
6
April
5.7
6
5
6
4
May
6.5
6
6
9
6
June
7.2
7
7
8
8
July
6.3
5
6
6
7
August
6.2
6
8
7
7
September
5.1
5
6
6
6
October
4.0
5
5
4
4
November
3.5
4
4
4
3
December
3.4
5
4
3
4
Average
5.3
5.5
5.1
5.4
5.7
5.3
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
110°
131°
101°
269°
093°
February
135°
124°
276°
239°
281°
March
273°
265°
138°
304°
286°
April
279°
265°
292°
283°
May
301°
285°
290°
254°
June
286°
294°
292°
292°
July
009°
328°
106°
295°
August
257°
275°
030°
300°
September
025°
042°
337°
086°
October
309°
309°
342°
294°
November
297°
098°
314°
338°
December
082°
103°
079°
109°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.