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
98.6
100
100
99
91
99
February
97.4
100
100
92
100
95
March
99.4
99
100
99
100
100
April
99.9
100
100
99
100
May
100.0
100
100
100
100
100
June
99.8
100
99
100
100
July
99.9
100
100
100
100
August
99.9
100
100
100
100
September
99.2
100
100
96
100
October
99.7
100
100
100
100
November
99.8
100
100
100
99
December
99.4
97
100
100
100
Average
99.4
99.7
99.6
99.1
98.7
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
21.2
21.8
23.8
21.3
21.0
20.6
February
21.5
21.5
23.1
20.3
22.1
21.0
March
22.0
22.1
22.5
23.6
21.3
21.6
April
23.1
24.6
24.3
22.5
22.5
May
24.1
24.1
24.5
24.6
24.3
24.1
June
25.5
25.3
26.8
25.6
25.0
July
27.1
27.3
28.1
27.8
26.8
August
28.0
28.0
29.5
27.3
27.6
September
27.0
26.6
27.8
27.1
27.1
October
26.4
25.8
29.1
26.1
25.6
November
24.5
26.1
25.6
25.0
22.8
December
22.2
22.6
23.0
23.5
22.0
Average
24.2
22.4
25.0
25.4
24.5
23.9
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
16.0
16.3
17.6
16.8
15.6
15.9
February
16.2
16.5
18.1
14.8
16.8
15.8
March
16.6
16.0
16.8
18.1
16.3
16.6
April
17.5
18.6
18.1
17.1
17.6
May
18.7
18.6
18.8
19.1
18.8
19.1
June
20.3
20.1
21.1
20.5
19.8
July
21.7
21.3
23.0
22.1
21.1
August
22.6
22.8
23.8
22.5
22.3
September
22.2
21.6
21.8
22.3
22.5
October
21.5
21.1
23.3
21.5
21.3
November
19.3
20.0
20.3
20.3
18.5
December
17.2
18.1
17.8
18.5
16.6
Average
18.9
16.8
19.6
19.9
19.4
18.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.7
1
1
5
8
7
February
3.5
1
1
4
6
6
March
2.8
4
4
2
5
3
April
1.2
0
0
2
2
May
0.6
1
0
1
1
0
June
1.0
2
3
1
1
July
0.2
0
0
1
0
August
0.4
0
0
1
1
September
2.3
0
1
12
1
October
2.2
1
1
0
1
November
2.3
2
1
0
4
December
2.4
3
6
2
2
Average
1.8
1.7
1.0
1.7
3.3
2.1
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
11.4
13
9
13
9
13
February
12.9
13
14
11
14
12
March
15.1
12
14
16
17
15
April
15.4
16
17
17
13
May
18.6
17
20
18
18
23
June
19.1
21
14
22
22
July
24.2
24
24
24
25
August
22.5
24
21
24
21
September
17.4
18
15
16
17
October
13.4
15
10
15
17
November
12.1
9
13
13
12
December
10.3
10
9
8
11
Average
16.1
13.9
16.5
15.4
17.1
17.1
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
023°
064°
018°
038°
019°
February
023°
019°
021°
021°
019°
March
020°
018°
020°
010°
021°
April
023°
016°
015°
030°
May
024°
019°
016°
021°
016°
June
018°
028°
015°
019°
July
018°
013°
013°
015°
August
017°
015°
016°
020°
September
021°
022°
017°
024°
October
025°
027°
016°
023°
November
067°
018°
020°
026°
December
035°
037°
037°
035°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.