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
99
94
100
100
February
97.4
100
99
96
96
96
March
99.4
100
100
99
100
100
April
98.0
98
98
100
99
May
98.1
98
95
100
100
June
97.6
95
98
96
98
July
98.0
100
99
96
97
August
98.5
99
100
97
100
September
98.6
100
98
97
98
October
98.0
98
99
95
97
November
97.8
95
98
97
98
December
97.8
99
96
94
97
Average
98.3
100.0
98.2
97.3
97.2
98.1
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
2021
January
24.0
23.3
25.1
23.1
25.8
24.1
February
24.5
25.1
24.3
23.1
25.8
24.5
March
22.8
23.3
21.1
21.8
24.1
22.8
April
20.5
20.1
20.8
21.6
20.5
May
17.8
16.6
18.5
18.8
17.6
June
15.8
16.5
15.8
16.1
16.6
July
15.1
15.0
15.0
15.8
15.3
August
15.5
15.9
14.5
16.1
15.5
September
16.6
16.8
17.1
17.1
16.5
October
18.2
18.6
18.5
18.3
18.3
November
20.5
20.0
19.8
20.8
21.6
December
22.8
23.1
22.6
22.1
23.8
Average
20.0
23.9
19.4
19.2
20.1
19.7
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
17.2
16.3
17.8
17.5
17.3
16.5
February
17.2
17.5
16.3
16.8
18.5
16.3
March
15.5
15.0
14.4
14.4
16.1
15.4
April
13.8
14.0
15.0
14.0
14.1
May
11.3
10.0
12.9
11.9
11.3
June
9.7
10.5
9.3
10.5
10.5
July
9.0
8.5
9.6
10.5
8.6
August
9.2
9.1
7.5
10.0
9.4
September
10.6
11.3
11.5
10.5
10.0
October
12.3
12.0
12.5
12.3
12.9
November
14.0
14.1
13.0
14.3
15.0
December
16.4
16.5
16.6
16.3
17.8
Average
13.4
16.2
12.8
13.0
13.4
13.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
12.2
4
6
23
5
18
February
11.7
2
5
17
11
8
March
12.7
6
11
3
11
19
April
17.0
7
14
11
17
May
18.9
12
15
14
23
June
25.4
6
19
30
22
July
29.1
16
18
38
24
August
25.0
11
12
20
31
September
20.1
11
14
23
19
October
16.8
8
8
22
25
November
17.6
8
10
37
16
December
14.0
4
19
16
18
Average
16.6
3.9
8.3
14.3
19.5
19.6
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
12.9
14
11
13
12
12
February
11.6
11
12
13
12
11
March
10.8
11
12
11
11
10
April
11.0
11
13
11
11
May
10.2
10
13
10
10
June
9.5
8
10
10
10
July
10.7
9
14
11
10
August
11.3
11
10
10
12
September
13.0
13
14
11
13
October
12.8
13
14
12
13
November
11.9
12
12
12
11
December
12.4
12
12
11
12
Average
11.6
12.0
11.4
12.2
11.1
11.4
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
232°
256°
076°
231°
248°
February
236°
235°
216°
021°
024°
March
231°
233°
235°
070°
298°
April
253°
070°
199°
250°
May
227°
001°
266°
219°
June
038°
191°
294°
275°
July
243°
239°
303°
287°
August
261°
241°
346°
279°
September
248°
274°
331°
262°
October
282°
248°
257°
280°
November
242°
235°
285°
249°
December
239°
265°
189°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.