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
81.4
82
83
93
72
82
February
85.9
89
83
91
84
84
March
93.7
95
95
91
98
95
April
92.1
97
86
84
95
May
91.2
94
96
91
89
91
June
91.7
98
92
92
93
86
July
91.0
91
95
89
91
August
95.6
95
99
91
94
September
92.4
90
93
96
89
October
88.2
85
94
91
91
November
86.1
81
89
92
73
December
80.1
70
74
78
89
Average
90.0
92.5
89.2
91.3
89.0
88.9
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
10.7
12.0
12.4
10.4
10.5
9.5
February
14.3
15.0
14.1
13.6
14.4
15.4
March
16.4
16.3
17.1
17.8
16.3
16.3
April
19.1
19.6
19.3
17.6
18.3
May
22.3
23.0
20.8
22.6
24.6
20.3
June
26.1
29.1
24.6
26.6
27.5
25.5
July
28.2
27.6
27.6
32.0
25.6
August
29.1
28.6
29.8
32.2
26.8
September
25.9
22.1
28.8
26.8
26.0
October
21.4
20.5
24.1
24.5
21.0
November
15.1
17.1
15.6
16.3
12.1
December
12.1
11.1
12.5
11.0
13.8
Average
20.0
19.1
19.7
20.8
21.4
19.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
1.9
2.5
2.9
2.1
-1.5
1.3
February
2.9
3.3
5.0
-1.1
3.3
6.0
March
5.1
4.7
6.0
6.5
5.5
4.2
April
6.9
6.9
7.2
7.0
5.0
May
10.1
10.5
10.0
9.6
10.8
8.4
June
14.9
16.3
14.0
16.1
15.8
14.8
July
15.9
16.3
16.1
15.1
14.8
August
15.5
15.9
14.0
17.8
14.5
September
12.7
12.3
14.5
12.3
14.1
October
9.9
11.3
11.3
12.8
6.9
November
5.0
6.0
7.0
6.2
3.7
December
4.0
3.7
4.5
3.0
3.6
Average
8.6
7.5
9.2
9.1
9.3
8.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
22.8
25
16
24
16
33
February
18.8
22
28
6
21
23
March
22.1
18
28
24
20
14
April
19.0
18
24
27
12
May
16.1
8
33
18
8
23
June
13.8
4
18
14
16
15
July
4.4
6
3
0
8
August
6.5
6
2
7
8
September
14.9
23
11
7
23
October
17.7
29
20
0
11
November
25.6
16
43
20
25
December
27.2
23
32
17
33
Average
16.3
13.5
19.9
17.0
12.5
17.9
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
4.9
6
4
4
4
6
February
5.4
5
5
4
6
7
March
6.3
6
6
7
6
6
April
5.9
6
6
7
6
May
5.7
6
6
6
5
6
June
5.2
5
6
5
5
5
July
5.2
6
5
5
5
August
5.2
5
6
5
5
September
5.1
6
5
6
4
October
4.8
5
5
5
4
November
4.8
5
6
5
4
December
5.0
5
5
4
5
Average
5.3
5.5
5.5
5.4
5.2
5.2
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
217°
134°
252°
281°
255°
February
105°
242°
049°
264°
122°
March
080°
227°
264°
085°
303°
April
294°
274°
281°
028°
May
293°
270°
306°
287°
268°
June
309°
284°
289°
278°
265°
July
290°
274°
289°
277°
August
285°
270°
271°
284°
September
270°
117°
271°
260°
October
144°
206°
144°
297°
November
086°
247°
237°
273°
December
288°
243°
077°
235°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.