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
89.0
87
88
95
80
95
February
91.0
94
88
94
95
80
March
93.5
86
97
96
86
96
April
94.0
96
98
95
93
May
97.0
98
97
97
99
99
June
97.3
98
96
96
98
95
July
98.8
99
98
99
99
August
99.0
99
100
100
99
September
96.3
97
95
97
92
October
88.9
79
94
89
95
November
90.5
86
96
93
87
December
88.6
87
92
85
89
Average
94.2
93.4
93.2
96.2
94.0
93.8
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
9.9
11.5
11.5
9.0
9.1
8.6
February
13.2
13.9
13.8
12.1
13.9
13.5
March
15.3
14.4
17.1
16.0
14.3
15.0
April
18.2
18.3
19.1
17.3
17.3
May
22.0
22.6
21.1
21.8
24.8
21.3
June
27.1
30.8
26.3
27.5
26.3
26.8
July
29.7
30.1
29.3
32.5
28.1
August
30.2
30.6
30.6
32.7
29.1
September
25.7
23.8
28.3
26.0
25.5
October
20.9
20.5
24.3
23.6
20.1
November
14.4
15.8
15.1
16.1
11.6
December
11.4
10.9
12.3
10.4
12.4
Average
19.7
18.6
20.0
20.5
21.0
19.1
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
3.1
3.3
4.0
3.5
1.1
2.2
February
4.9
5.4
5.7
2.2
5.0
7.9
March
6.3
7.4
6.9
6.2
7.5
5.5
April
8.1
8.1
7.9
8.0
6.9
May
11.6
12.0
10.9
11.9
13.4
9.3
June
15.7
17.6
15.5
16.6
13.3
16.3
July
17.8
17.8
18.0
17.1
16.5
August
17.9
18.8
18.1
19.3
16.3
September
14.6
13.9
15.9
15.0
16.1
October
11.8
13.0
12.0
14.8
9.8
November
6.8
7.5
6.7
8.3
6.0
December
4.4
3.7
4.5
3.6
4.2
Average
10.1
9.2
10.5
10.3
10.8
9.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
19.8
12
18
19
12
22
February
15.2
6
20
4
10
25
March
15.6
21
8
15
21
7
April
14.1
17
19
12
14
May
13.0
10
11
23
2
18
June
5.4
5
6
7
5
4
July
4.2
3
2
2
7
August
4.1
4
8
1
4
September
10.0
17
5
9
15
October
10.7
12
4
1
5
November
18.3
10
23
18
24
December
21.4
23
25
5
19
Average
11.8
10.6
11.5
12.2
7.7
12.7
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
10.5
9
8
11
10
12
February
10.9
10
10
11
12
12
March
12.0
12
11
12
13
13
April
11.6
12
11
12
12
May
10.3
11
10
10
11
10
June
9.9
9
10
9
10
11
July
10.2
11
10
10
10
August
10.2
11
10
10
10
September
10.1
11
11
10
9
October
10.3
10
9
11
10
November
9.6
9
9
9
10
December
9.6
10
9
8
10
Average
10.4
10.0
10.2
10.1
10.5
10.6
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
287°
275°
278°
274°
279°
February
035°
281°
295°
286°
079°
March
041°
360°
297°
083°
291°
April
310°
285°
286°
352°
May
301°
291°
283°
315°
287°
June
305°
311°
347°
356°
307°
July
313°
293°
288°
286°
August
289°
289°
293°
289°
September
298°
073°
297°
061°
October
069°
066°
077°
324°
November
054°
277°
293°
279°
December
281°
274°
005°
284°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.