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
97.9
96
100
96
100
100
February
96.6
96
92
95
98
94
March
98.0
98
97
98
100
98
April
98.4
100
98
98
98
May
98.5
99
98
99
98
100
June
99.4
100
100
98
100
100
July
99.7
99
99
100
100
August
99.6
100
99
100
100
September
99.6
100
100
99
100
October
98.3
98
98
96
97
November
98.3
100
99
98
96
December
97.2
97
97
95
95
Average
98.5
97.8
98.3
98.2
98.7
98.2
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
14.8
15.5
16.1
14.5
14.0
13.8
February
16.5
16.3
17.5
16.3
16.8
17.6
March
18.2
18.0
18.8
20.0
16.8
18.0
April
21.0
22.0
21.8
20.8
19.3
May
25.2
25.6
25.6
24.5
28.1
24.6
June
31.1
34.1
29.3
30.1
34.1
30.6
July
34.6
34.1
36.8
36.7
33.6
August
33.9
34.5
33.5
34.8
34.2
September
29.8
28.3
32.1
31.3
31.1
October
25.2
24.8
28.8
26.8
24.1
November
19.4
20.6
20.6
21.1
17.8
December
15.7
14.9
17.3
18.1
15.1
Average
23.6
21.9
23.9
24.7
25.2
23.4
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
5.0
6.7
6.0
3.9
3.9
6.4
February
5.5
7.2
6.5
3.1
4.9
7.0
March
7.0
9.0
8.5
6.2
7.0
5.7
April
8.8
9.0
7.5
9.0
8.4
May
13.0
13.0
13.5
12.8
13.5
12.8
June
18.0
19.1
18.8
17.6
19.0
18.3
July
20.9
21.3
21.8
21.0
20.6
August
20.7
22.1
19.3
21.1
21.3
September
18.2
18.0
17.8
18.8
20.3
October
14.0
16.6
15.6
14.0
12.9
November
9.7
10.4
11.0
10.0
9.9
December
6.5
5.5
7.2
7.5
5.7
Average
12.1
11.0
13.0
12.0
12.7
12.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
5.8
4
4
9
3
10
February
4.7
6
7
6
2
3
March
4.8
7
7
0
5
3
April
4.3
2
2
5
8
May
4.8
4
2
7
3
2
June
1.7
0
1
4
1
1
July
0.3
0
0
0
1
August
0.8
1
1
1
0
September
1.2
1
0
1
1
October
2.6
3
3
2
3
November
9.7
2
5
10
14
December
7.1
7
4
6
11
Average
3.8
4.0
2.8
3.2
2.7
4.3
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
7.5
6
7
7
8
8
February
7.7
7
7
6
10
7
March
8.3
8
8
9
8
8
April
8.4
10
9
9
8
May
8.6
8
8
8
7
9
June
9.0
8
10
8
9
9
July
9.6
10
10
9
10
August
8.8
8
10
8
9
September
8.3
9
8
9
8
October
7.6
8
8
7
7
November
6.7
6
9
7
5
December
7.4
7
8
5
7
Average
8.2
7.6
8.3
8.3
8.0
8.1
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
306°
302°
303°
312°
294°
February
268°
288°
108°
309°
253°
March
211°
275°
287°
125°
303°
April
288°
305°
226°
180°
May
289°
267°
299°
161°
292°
June
139°
295°
201°
164°
158°
July
240°
307°
098°
310°
August
247°
302°
301°
327°
September
277°
180°
279°
154°
October
149°
211°
157°
310°
November
273°
299°
296°
243°
December
308°
316°
250°
295°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.