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
82.3
90
92
75
81
76
February
89.4
83
86
98
98
98
March
95.8
96
96
99
92
96
April
97.2
100
98
99
100
May
99.0
97
99
100
100
100
June
99.7
100
100
99
100
100
July
99.1
99
98
99
99
August
99.7
100
100
99
100
September
99.0
99
100
99
96
October
97.4
97
98
96
100
November
90.6
90
92
92
86
December
79.0
81
83
81
81
Average
94.8
94.1
95.5
95.4
95.6
94.9
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
9.1
8.9
12.5
4.2
11.3
8.5
February
12.4
10.5
11.4
13.6
14.3
16.1
March
19.0
18.8
16.6
24.8
17.8
17.8
April
24.6
24.1
27.1
28.8
26.1
May
31.5
34.2
28.6
31.3
30.6
33.3
June
36.7
36.5
37.2
38.2
37.0
38.2
July
39.1
37.5
39.5
39.0
39.2
August
35.7
37.0
35.7
35.1
36.5
September
30.8
30.0
30.0
32.8
33.0
October
23.2
23.1
24.5
23.6
20.6
November
15.7
17.6
21.3
16.3
13.9
December
10.1
8.3
12.5
7.7
13.4
Average
23.8
21.9
23.7
25.3
25.0
24.7
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
-1.0
-1.4
2.2
-8.5
1.6
-3.2
February
1.8
0.2
2.0
3.2
2.7
3.2
March
6.7
6.2
6.5
11.3
5.7
4.7
April
11.3
11.5
12.1
14.5
10.5
May
16.6
18.3
15.5
16.5
16.3
18.1
June
20.3
20.5
21.5
21.6
20.6
20.8
July
22.8
22.1
23.1
23.1
21.8
August
19.2
20.8
20.0
18.3
20.1
September
14.1
13.9
14.0
15.1
15.1
October
8.5
10.3
10.8
9.4
5.5
November
3.7
6.0
8.0
5.2
2.0
December
0.1
-2.3
2.2
-2.1
1.8
Average
10.2
9.0
10.9
11.3
11.3
10.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
6.6
6
8
2
7
5
February
9.0
6
16
5
2
1
March
6.1
7
11
1
9
10
April
3.4
2
0
1
1
May
1.5
0
5
0
1
1
June
0.2
1
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.6
2
0
0
0
October
1.8
1
1
3
1
November
3.9
4
6
4
2
December
3.1
2
3
1
3
Average
2.8
3.3
3.8
1.1
2.1
1.8
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
5.4
5
6
4
6
5
February
6.4
5
7
7
6
6
March
6.6
6
7
7
7
8
April
6.3
6
7
6
6
May
6.8
7
7
7
8
7
June
7.4
8
7
8
8
7
July
9.0
7
10
10
9
August
7.3
8
8
6
7
September
5.9
6
6
6
6
October
5.3
5
6
5
5
November
4.7
4
5
5
4
December
4.8
5
6
4
6
Average
6.5
6.1
6.3
6.9
6.4
6.4
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
226°
198°
166°
160°
155°
February
294°
202°
223°
223°
203°
March
293°
142°
184°
330°
214°
April
281°
314°
296°
313°
May
311°
319°
320°
326°
322°
June
324°
333°
337°
330°
334°
July
320°
335°
339°
340°
August
324°
330°
308°
307°
September
303°
296°
304°
320°
October
336°
329°
320°
314°
November
331°
169°
191°
206°
December
287°
183°
351°
154°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.