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
98.2
100
100
98
100
100
February
98.0
100
100
96
99
March
99.0
100
100
99
100
April
98.8
98
100
May
99.9
100
100
100
June
99.9
99
100
July
99.8
100
100
100
100
August
99.2
95
100
100
September
98.8
96
98
99
October
99.5
100
100
100
99
November
98.8
100
100
99
December
97.8
100
100
100
97
Average
99.2
100.0
100.0
98.4
98.9
99.3
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
24.6
24.3
25.1
23.0
24.5
26.3
February
25.6
29.0
26.3
24.1
26.3
March
25.4
25.6
23.0
25.0
24.8
April
24.9
24.3
24.8
May
24.5
25.0
23.6
23.6
June
23.2
22.1
23.6
July
23.5
25.0
23.5
22.8
23.3
August
26.5
25.8
23.5
27.1
September
28.6
28.6
27.3
29.0
October
27.4
24.0
26.6
27.3
27.8
November
25.4
23.5
25.1
25.5
December
24.4
21.8
23.0
23.6
24.3
Average
25.2
24.6
23.8
25.2
24.5
25.6
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
17.9
21.3
20.8
18.0
18.0
17.3
February
18.1
24.0
18.8
18.1
17.1
March
17.7
17.6
20.5
18.3
16.3
April
17.5
17.5
16.6
May
16.1
24.0
15.1
15.3
June
13.1
13.8
12.4
July
13.6
21.0
18.5
14.0
11.5
August
17.2
19.6
18.0
16.3
September
19.3
20.6
19.6
19.3
October
19.0
24.0
18.8
19.3
19.6
November
18.6
20.0
18.8
18.3
December
18.1
19.3
19.0
18.8
18.3
Average
18.2
20.5
21.0
19.0
17.4
16.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
4.3
0
0
3
1
1
February
3.9
0
1
6
2
March
3.0
6
0
5
3
April
2.2
3
0
May
0.3
0
0
1
June
0.0
0
0
July
0.0
0
0
0
0
August
0.1
0
0
0
September
0.3
0
0
0
October
1.7
0
0
0
1
November
3.4
3
1
2
December
5.7
25
0
0
4
Average
3.1
2.5
10.5
1.0
1.4
1.1
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
6.4
6
6
5
7
7
February
6.4
5
5
7
7
March
5.8
4
6
5
5
April
6.6
5
9
May
7.0
9
5
7
June
7.1
4
7
July
7.5
7
6
3
9
August
6.8
6
4
7
September
6.9
6
3
8
October
6.3
0
6
2
7
November
6.1
5
4
6
December
6.0
4
3
3
6
Average
6.1
5.0
5.3
5.2
4.4
7.0
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
272°
244°
259°
330°
305°
February
092°
253°
280°
281°
March
148°
219°
166°
221°
April
171°
187°
May
115°
178°
198°
June
167°
202°
July
081°
107°
157°
207°
August
110°
153°
202°
September
115°
152°
189°
October
360°
120°
137°
210°
November
120°
161°
231°
December
014°
230°
225°
167°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.