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
21.4
7
12
12
24
9
February
48.3
20
32
71
76
35
March
77.6
59
64
84
98
54
April
88.3
81
93
99
73
May
86.2
41
70
99
100
94
June
82.5
56
100
93
75
July
70.6
38
50
72
86
August
62.7
22
100
79
77
September
58.2
36
0
59
74
October
46.5
13
56
57
November
31.7
0
24
41
December
17.1
5
7
13
2
Average
57.7
32.4
36.5
57.6
70.2
57.5
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
28.7
30.5
28.3
28.6
26.6
29.6
February
31.9
33.7
32.2
33.0
31.0
31.1
March
35.1
36.2
35.6
32.1
36.1
36.0
April
38.6
38.3
34.6
40.0
38.1
May
38.7
34.2
39.8
36.5
39.5
37.0
June
33.6
34.2
30.3
34.7
32.2
July
29.1
29.1
24.8
28.0
30.1
August
28.9
30.1
25.3
29.1
29.1
September
29.6
29.6
24.8
29.5
28.3
October
31.3
32.3
29.5
30.8
November
30.4
30.3
30.0
30.0
December
28.3
28.8
28.0
29.1
27.5
Average
32.2
33.7
32.3
30.8
32.0
31.6
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
13.8
15.3
14.6
14.5
13.6
17.0
February
16.5
17.8
17.3
15.5
15.9
16.0
March
20.1
21.6
20.3
17.6
21.8
19.6
April
24.8
24.6
24.0
26.3
24.1
May
25.9
24.3
26.6
23.6
26.8
25.0
June
22.7
24.8
27.5
20.6
20.1
July
21.1
23.8
24.3
22.8
20.3
August
21.7
23.1
23.6
22.6
21.0
September
21.8
22.6
24.0
21.6
22.5
October
19.6
21.8
19.6
19.3
November
16.5
15.8
15.1
18.1
December
15.1
16.1
15.0
16.6
15.6
Average
19.9
19.8
20.9
19.4
20.4
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
0.2
0
1
0
0
1
February
0.0
0
0
0
0
0
March
0.1
0
0
0
1
0
April
0.1
1
0
0
0
May
0.7
4
0
0
0
1
June
3.7
3
0
1
1
July
14.6
15
50
27
7
August
11.8
10
0
11
10
September
6.6
11
0
7
10
October
1.7
1
2
1
November
0.0
0
0
0
December
0.4
0
0
0
2
Average
2.9
1.0
3.6
0.1
4.4
2.9
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
2.6
3
3
3
2
2
February
3.0
3
4
2
3
3
March
3.2
3
3
3
3
3
April
3.3
3
3
3
3
May
4.2
4
4
2
4
4
June
4.7
4
4
4
4
July
4.9
5
5
4
4
August
4.6
4
4
4
4
September
3.5
4
0
3
3
October
2.8
3
2
2
November
2.9
3
2
3
December
2.7
3
3
3
2
Average
3.5
3.2
3.6
2.5
3.2
3.2
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
091°
109°
153°
088°
109°
February
086°
216°
081°
219°
092°
March
357°
265°
229°
032°
116°
April
064°
171°
313°
342°
May
280°
284°
272°
279°
258°
June
254°
259°
260°
251°
July
248°
230°
255°
255°
August
246°
282°
251°
262°
September
265°
360°
253°
246°
October
053°
029°
049°
November
060°
066°
076°
December
082°
086°
072°
082°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.