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
98.5
98
100
100
100
100
February
98.3
98
99
98
98
March
99.1
100
100
100
100
April
99.0
100
100
100
100
May
99.5
100
99
99
100
June
99.8
100
100
100
100
July
99.9
100
100
100
100
August
99.8
100
100
100
100
September
99.7
100
100
99
100
October
99.1
99
100
99
97
November
98.6
99
99
98
99
December
98.4
99
100
97
100
Average
99.1
98.2
99.6
99.7
99.4
99.4
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
14.6
16.1
15.3
15.4
13.9
15.1
February
15.9
17.0
14.9
15.0
17.3
March
17.5
18.3
17.1
14.8
16.8
April
20.8
22.8
18.6
20.1
19.3
May
24.6
25.1
23.5
25.5
24.8
June
30.1
32.5
29.1
32.0
29.8
July
33.5
35.7
34.1
34.5
33.8
August
33.6
35.1
32.7
33.2
33.8
September
29.0
27.8
29.6
28.0
28.5
October
24.6
24.6
26.5
24.3
22.1
November
20.3
19.8
20.1
20.1
20.5
December
16.4
16.1
16.5
18.0
15.0
Average
22.6
16.2
24.2
23.2
23.5
23.1
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
5.9
8.9
7.0
7.0
5.0
8.0
February
6.8
8.1
5.5
6.2
6.7
March
8.1
9.5
8.5
5.4
6.9
April
10.8
12.4
9.9
10.9
9.5
May
15.0
16.1
15.1
15.0
14.5
June
19.6
21.3
19.6
21.1
18.3
July
22.0
24.3
22.3
22.1
22.3
August
22.4
23.5
22.0
22.5
22.8
September
19.1
19.8
19.8
18.6
18.3
October
15.0
15.5
17.6
14.0
14.0
November
11.7
10.1
12.1
11.9
13.5
December
8.3
7.2
8.5
11.9
7.2
Average
13.2
8.9
14.6
14.0
13.8
13.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
11.2
10
11
11
6
17
February
8.8
6
0
9
9
March
6.4
7
5
7
5
April
4.8
3
8
4
3
May
4.3
1
13
3
2
June
1.8
1
2
1
0
July
0.3
0
0
0
0
August
0.5
1
1
0
0
September
3.2
5
5
2
4
October
4.3
2
4
4
13
November
10.1
3
12
6
11
December
11.8
12
5
18
16
Average
5.5
9.4
3.8
5.3
4.1
5.6
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
5.8
5
5
6
5
9
February
6.3
6
5
7
6
March
6.3
6
6
6
7
April
5.9
5
7
7
6
May
5.7
6
5
5
6
June
5.1
5
4
5
6
July
5.3
6
5
6
6
August
4.9
5
5
6
6
September
5.2
6
4
7
5
October
4.9
5
6
4
5
November
6.0
4
7
6
7
December
5.7
4
3
7
6
Average
5.5
5.1
5.4
5.2
5.7
5.9
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
126°
139°
151°
093°
193°
February
147°
123°
135°
170°
March
146°
150°
170°
258°
April
235°
201°
180°
219°
May
211°
148°
145°
248°
June
237°
197°
197°
249°
July
261°
249°
264°
254°
August
230°
242°
238°
228°
September
200°
173°
202°
204°
October
148°
153°
200°
135°
November
202°
193°
139°
155°
December
143°
166°
143°
154°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.