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
99.5
100
100
100
97
100
February
99.3
100
100
100
100
99
March
98.7
99
98
100
95
98
April
99.2
100
100
100
100
May
99.4
100
100
99
99
100
June
99.8
100
100
100
100
100
July
99.8
100
100
100
99
August
99.8
100
100
100
100
September
99.5
100
98
100
100
October
99.7
100
100
99
100
November
99.2
98
99
99
100
December
100.0
100
100
100
100
Average
99.5
99.6
99.7
99.5
98.9
99.5
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
16.8
18.0
18.1
16.6
15.9
16.6
February
17.6
17.8
19.3
15.4
17.5
18.3
March
19.1
18.5
20.3
21.6
16.8
18.0
April
20.4
20.8
23.0
19.8
19.1
May
24.1
25.3
24.1
23.1
25.0
23.6
June
27.9
31.1
27.1
27.3
29.1
27.0
July
30.5
30.5
31.1
31.8
30.0
August
30.9
30.8
30.8
32.6
30.8
September
28.1
27.3
27.6
29.6
29.1
October
24.8
25.0
26.0
25.6
24.6
November
20.6
21.8
22.6
21.8
19.0
December
18.0
18.0
18.3
18.0
18.1
Average
23.1
22.1
23.6
23.7
23.8
22.9
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
7.1
8.3
9.4
6.2
6.0
7.0
February
8.0
7.7
9.3
6.5
7.7
9.5
March
9.8
10.6
10.1
10.0
10.6
9.3
April
11.8
11.8
12.6
11.3
12.3
May
15.0
15.9
14.6
15.3
14.6
14.5
June
19.4
21.8
19.6
19.6
19.5
18.8
July
22.3
22.3
23.8
22.3
21.5
August
22.9
23.5
23.5
23.1
22.1
September
20.3
20.5
20.5
20.3
20.8
October
15.8
17.0
16.3
16.8
16.6
November
11.7
14.0
12.3
12.5
10.6
December
8.5
8.3
7.7
10.5
9.8
Average
14.2
12.9
15.0
14.5
14.8
14.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
2.7
2
0
0
5
7
February
2.0
1
2
4
1
0
March
6.0
9
3
0
16
6
April
5.7
4
0
14
10
May
3.0
4
0
11
3
4
June
1.2
0
1
3
0
3
July
0.2
0
0
0
1
August
0.7
1
0
0
0
September
2.1
3
1
2
1
October
2.0
2
0
0
2
November
2.3
2
0
2
4
December
1.7
3
0
5
0
Average
2.5
3.2
1.6
1.8
4.0
2.9
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
8.1
8
8
8
7
9
February
7.7
6
8
8
7
9
March
8.8
10
9
8
10
8
April
8.0
7
7
9
8
May
7.3
7
8
7
7
8
June
7.0
6
8
6
6
7
July
7.1
7
7
7
7
August
7.1
8
7
7
7
September
7.3
7
7
8
7
October
6.7
8
7
5
7
November
7.7
7
8
8
9
December
7.6
7
7
4
9
Average
7.5
7.3
7.6
7.3
7.1
7.9
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
264°
257°
279°
341°
279°
February
135°
278°
052°
080°
006°
March
077°
245°
229°
061°
078°
April
103°
108°
021°
096°
May
110°
113°
085°
093°
104°
June
099°
098°
098°
101°
090°
July
092°
096°
090°
096°
August
092°
096°
098°
098°
September
103°
088°
089°
098°
October
041°
195°
103°
106°
November
071°
262°
275°
301°
December
282°
261°
259°
290°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.