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
January
99.4
100
100
99
99
February
99.1
99
99
99
100
March
97.3
98
99
96
97
April
98.5
99
99
98
May
98.9
100
99
100
98
June
99.8
100
100
100
100
July
100.0
100
100
100
August
100.0
100
100
100
September
100.0
100
100
100
October
100.0
100
100
100
November
100.0
100
100
100
December
100.0
100
100
100
Average
99.3
99.2
99.6
99.2
99.1
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
January
23.9
31.1
0.0
33.7
30.8
February
28.8
30.1
21.6
32.6
31.3
March
30.3
29.3
30.3
32.2
29.6
April
30.8
29.3
33.2
30.0
May
31.8
31.3
31.1
34.7
30.3
June
32.0
31.6
31.5
34.2
30.6
July
33.4
31.8
36.7
31.6
August
33.8
33.0
35.6
32.7
September
34.1
32.7
36.2
33.5
October
34.4
32.3
35.5
35.7
November
30.8
32.7
24.6
35.2
December
20.9
32.7
0.0
35.7
Average
30.4
30.7
28.3
30.7
32.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
January
20.1
26.6
0.0
29.3
24.6
February
24.4
25.6
17.6
28.5
26.3
March
25.9
24.5
25.5
28.3
25.3
April
25.4
21.8
29.3
25.1
May
27.2
26.1
26.3
30.8
25.6
June
27.3
26.6
26.3
29.8
26.3
July
28.4
26.0
31.3
28.0
August
28.0
25.6
30.0
28.6
September
27.9
25.6
29.3
28.8
October
28.6
25.8
29.0
31.5
November
25.7
26.5
19.6
31.0
December
17.6
27.0
0.0
31.1
Average
25.6
25.9
22.8
26.2
27.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
January
3.9
5
1
3
7
February
7.7
7
13
8
3
March
15.6
15
17
16
15
April
12.6
16
9
13
May
5.4
6
4
3
8
June
2.6
5
1
3
2
July
0.6
1
0
1
August
0.1
0
1
0
September
0.0
0
0
0
October
0.0
0
0
0
November
0.1
0
0
1
December
0.5
1
0
0
Average
5.0
7.4
4.4
3.3
4.8
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
January
7.9
11
0
11
10
February
8.6
9
5
9
12
March
6.6
8
5
6
8
April
6.4
6
6
7
May
8.0
9
8
8
7
June
9.2
11
10
9
8
July
10.5
11
11
9
August
12.3
13
12
12
September
14.6
15
14
14
October
15.1
15
15
16
November
13.4
16
11
14
December
8.9
14
0
15
Average
9.7
9.5
9.8
9.4
10.2
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
January
045°
360°
053°
062°
February
060°
053°
060°
055°
March
052°
052°
059°
060°
April
058°
060°
065°
May
071°
084°
073°
086°
June
068°
096°
071°
098°
July
078°
069°
084°
August
072°
058°
065°
September
061°
065°
056°
October
054°
059°
056°
November
051°
055°
048°
December
054°
360°
051°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.