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
95.2
97
91
94
88
97
February
94.6
97
98
91
85
96
March
95.0
83
85
100
97
98
April
97.5
92
99
99
97
May
98.3
96
99
99
98
June
95.9
87
94
97
96
July
96.0
94
90
100
92
August
98.4
100
91
99
100
September
98.6
96
99
99
99
October
97.5
98
98
99
98
November
95.8
97
91
100
94
December
93.4
95
82
97
93
Average
96.0
91.5
93.7
94.0
97.0
96.5
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
11.9
13.0
12.5
11.8
12.0
10.4
February
14.2
14.3
15.4
13.4
15.1
15.3
March
16.7
16.6
16.8
17.0
17.1
15.8
April
19.5
19.5
20.0
19.8
17.8
May
23.4
22.5
23.5
26.3
22.1
June
28.9
27.5
28.8
31.6
29.3
July
31.8
31.6
32.2
33.3
30.3
August
31.2
32.5
30.6
32.2
29.8
September
26.5
24.8
28.3
26.3
27.5
October
22.3
22.5
24.1
24.3
21.3
November
16.2
17.6
15.5
17.3
15.4
December
12.5
12.5
13.3
11.9
12.0
Average
20.6
14.6
21.3
21.6
22.6
20.6
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
3.4
4.7
3.9
3.2
0.9
3.1
February
5.1
6.2
5.7
2.9
5.4
6.9
March
7.0
7.5
8.8
6.7
6.7
5.2
April
9.2
10.3
9.5
8.8
7.5
May
13.5
13.3
14.0
15.1
12.5
June
18.6
17.6
19.3
20.8
18.8
July
20.9
20.8
21.8
21.8
19.5
August
20.1
21.3
19.6
20.6
18.6
September
16.7
16.0
17.8
17.3
17.5
October
13.2
14.5
14.8
15.4
11.5
November
8.0
8.3
7.2
9.1
7.7
December
4.2
3.2
4.7
4.2
3.7
Average
11.1
6.2
12.0
11.8
12.4
11.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
6.1
4
11
2
0
13
February
8.2
17
6
8
4
7
March
6.7
14
15
1
6
3
April
9.0
4
6
8
8
May
8.2
12
13
3
9
June
3.6
6
3
3
5
July
0.6
0
0
0
2
August
1.7
1
2
1
3
September
4.1
3
4
2
9
October
7.6
16
6
5
6
November
11.9
13
8
11
16
December
10.2
5
9
19
12
Average
6.6
11.7
7.3
4.8
4.1
7.2
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
10.0
8
9
10
9
11
February
9.4
8
9
8
13
8
March
10.6
11
13
10
9
10
April
10.9
15
12
10
10
May
9.9
10
10
9
11
June
10.1
11
9
11
10
July
10.7
11
12
10
11
August
10.4
9
13
10
11
September
10.0
12
9
11
9
October
9.7
10
9
7
10
November
9.3
7
11
10
9
December
8.7
9
10
8
7
Average
10.0
9.1
10.6
10.3
9.7
9.7
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
133°
310°
313°
318°
313°
February
279°
286°
309°
305°
117°
March
069°
242°
275°
143°
300°
April
317°
284°
270°
285°
May
263°
295°
247°
274°
June
269°
264°
235°
226°
July
282°
272°
269°
268°
August
279°
288°
271°
285°
September
299°
217°
290°
248°
October
135°
196°
183°
311°
November
329°
313°
324°
320°
December
315°
313°
358°
311°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.