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
98.8
99
100
97
100
100
February
98.7
99
97
99
99
97
March
99.3
100
99
100
99
April
99.7
100
100
100
100
May
99.5
100
100
99
100
June
99.8
100
100
100
100
July
99.6
98
99
100
100
August
99.7
100
100
100
100
September
99.8
100
100
100
100
October
99.1
99
99
98
99
November
99.4
100
100
100
99
December
99.1
100
100
99
97
Average
99.4
99.1
99.4
99.4
99.5
99.2
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
14.9
16.3
16.3
14.4
14.5
14.1
February
16.1
16.3
17.8
14.9
16.6
16.1
March
17.6
18.8
18.6
16.1
17.1
April
20.0
21.5
20.6
19.3
18.5
May
23.9
25.0
23.1
25.3
24.0
June
29.1
28.8
28.6
31.8
29.1
July
32.5
32.2
34.0
33.8
32.3
August
32.1
32.8
31.1
33.0
32.7
September
28.6
27.8
29.6
29.8
29.0
October
24.5
24.6
27.3
25.3
23.8
November
19.4
20.8
21.1
20.5
17.8
December
16.0
16.0
17.0
17.3
15.1
Average
22.2
16.2
23.5
23.4
23.8
22.5
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
5.7
6.5
7.0
5.0
4.0
7.0
February
6.1
7.7
7.4
4.5
5.2
7.2
March
7.8
9.4
7.5
8.0
6.5
April
9.9
10.0
9.3
9.6
9.5
May
13.7
14.5
13.8
14.0
13.5
June
18.7
18.6
19.1
20.1
19.3
July
21.1
21.3
22.6
21.0
20.6
August
21.1
22.3
20.6
22.0
20.8
September
18.6
18.0
19.0
19.8
20.1
October
14.7
16.6
16.6
15.0
13.3
November
10.6
10.5
12.1
10.9
10.5
December
7.0
5.2
8.0
8.9
6.0
Average
12.3
7.1
13.4
13.2
13.4
12.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
6.4
4
6
9
3
12
February
5.3
7
6
7
1
5
March
4.5
7
1
6
3
April
4.9
1
3
5
11
May
4.7
2
9
5
2
June
1.7
1
4
0
0
July
0.1
0
0
0
0
August
0.9
1
1
1
0
September
2.2
2
0
2
3
October
3.2
5
3
2
5
November
9.5
1
3
9
18
December
7.1
6
3
4
13
Average
4.0
5.0
2.8
3.2
2.9
5.2
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
8.6
7
8
8
9
8
February
8.4
8
8
7
10
8
March
9.4
9
10
10
9
April
9.3
11
9
9
9
May
8.9
9
8
8
9
June
8.9
10
9
9
9
July
9.5
10
10
8
10
August
8.7
8
10
8
9
September
8.4
9
8
8
8
October
7.9
8
8
7
7
November
7.3
7
9
7
6
December
8.1
8
9
6
7
Average
8.5
7.3
8.8
8.7
8.4
8.4
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
347°
341°
331°
335°
323°
February
304°
320°
170°
337°
248°
March
308°
323°
149°
311°
April
311°
331°
242°
195°
May
277°
311°
180°
322°
June
265°
229°
227°
190°
July
262°
311°
183°
344°
August
230°
315°
282°
326°
September
313°
205°
288°
180°
October
167°
270°
206°
305°
November
313°
333°
327°
295°
December
341°
346°
304°
334°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.