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
42.6
17
33
42
46
37
February
57.8
35
58
64
61
60
March
66.2
49
71
60
72
64
April
68.1
82
68
66
63
May
63.3
31
71
73
60
60
June
50.9
26
64
43
56
55
July
28.3
11
19
33
39
August
29.9
6
43
33
52
September
41.0
20
55
51
30
October
57.8
30
60
58
63
November
47.0
29
37
52
52
December
41.0
18
27
43
45
Average
48.5
31.4
41.2
49.2
52.7
51.5
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
26.8
27.1
26.8
25.6
25.5
27.5
February
31.2
30.8
29.8
32.2
31.8
32.2
March
35.8
35.2
33.7
33.7
38.5
38.7
April
40.4
37.3
37.0
42.3
42.1
May
41.3
36.1
40.7
39.3
43.5
40.2
June
37.7
33.6
37.6
35.2
40.7
36.5
July
33.3
32.1
32.5
33.3
34.0
August
32.0
30.3
31.8
33.1
33.5
September
33.3
31.3
33.2
35.1
31.6
October
35.3
33.6
34.2
35.5
33.8
November
32.3
31.8
31.1
33.5
31.8
December
27.5
26.5
27.3
31.0
26.3
Average
33.9
32.6
32.6
32.8
35.4
34.0
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
13.2
15.0
14.0
13.0
11.6
13.0
February
16.3
17.3
17.6
16.3
16.3
16.1
March
20.5
20.6
20.1
21.5
22.8
20.8
April
25.7
26.0
25.3
25.5
26.1
May
28.3
26.5
29.0
26.8
30.1
28.3
June
27.9
26.1
28.6
27.8
29.3
27.3
July
26.7
26.6
26.6
27.1
26.8
August
26.3
25.6
26.3
26.8
26.3
September
25.8
24.5
26.1
26.8
25.6
October
23.2
24.8
23.1
23.3
22.6
November
18.1
19.3
17.5
18.5
17.3
December
15.0
15.0
16.8
18.1
14.1
Average
22.2
21.2
22.6
22.3
23.2
22.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.2
0
0
1
2
0
February
0.0
0
0
0
0
0
March
0.0
0
0
1
0
0
April
0.1
0
0
0
0
May
0.5
1
1
0
0
4
June
3.8
15
3
5
2
4
July
12.7
16
11
15
11
August
13.3
23
6
17
3
September
4.9
7
7
2
7
October
0.4
3
0
0
0
November
0.2
0
1
0
0
December
0.9
0
0
0
3
Average
3.2
3.2
4.7
2.7
3.3
2.8
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
5.2
7
6
6
5
5
February
4.7
6
6
4
3
4
March
4.9
5
5
5
5
5
April
5.2
5
5
5
4
May
6.5
6
7
7
8
6
June
6.7
6
7
8
7
6
July
6.0
6
6
6
6
August
6.3
7
8
6
6
September
4.8
6
6
5
5
October
4.2
5
4
5
4
November
4.4
5
5
4
6
December
5.8
7
7
6
6
Average
5.5
5.8
6.0
6.1
5.5
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
018°
032°
046°
031°
032°
February
353°
013°
026°
008°
011°
March
333°
283°
324°
338°
320°
April
259°
289°
284°
293°
May
170°
243°
262°
248°
256°
June
206°
204°
222°
238°
250°
July
187°
252°
237°
239°
August
197°
240°
237°
254°
September
252°
276°
290°
233°
October
004°
346°
026°
360°
November
026°
054°
067°
058°
December
020°
045°
056°
045°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.