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
94.2
92
94
95
95
93
February
94.8
97
98
94
89
99
March
95.4
93
94
97
96
96
April
96.4
95
97
98
99
May
98.6
100
99
99
99
97
June
96.8
97
95
95
98
98
July
98.1
99
97
97
98
August
97.8
96
99
99
96
September
98.1
99
98
96
98
October
97.4
97
99
97
99
November
96.9
96
98
96
95
December
96.3
96
95
98
94
Average
96.6
95.7
96.3
96.9
96.4
96.7
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
30.7
31.3
30.6
30.5
30.3
30.3
February
30.7
31.3
31.0
29.8
29.5
30.6
March
31.1
30.8
30.5
30.8
31.3
30.8
April
32.0
31.5
31.8
32.1
32.2
May
32.6
31.5
32.3
33.0
31.6
32.3
June
32.2
31.6
31.8
32.2
31.8
33.1
July
32.4
31.8
32.1
31.5
33.0
August
33.0
31.8
33.5
31.6
33.3
September
33.1
33.6
33.2
32.2
32.5
October
32.9
33.0
34.2
32.2
33.2
November
32.1
32.1
33.1
31.5
31.6
December
31.3
31.6
31.8
31.0
30.0
Average
31.9
31.3
31.8
32.2
31.4
31.9
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
23.2
23.6
23.6
22.8
23.3
23.6
February
22.7
22.8
23.3
23.3
23.3
24.0
March
23.1
23.6
24.0
23.3
23.5
23.5
April
23.3
23.6
23.5
23.6
23.6
May
23.4
23.8
24.0
23.6
21.5
23.8
June
23.0
23.3
23.8
22.5
22.8
23.1
July
23.1
23.6
23.6
21.6
23.5
August
22.6
23.1
23.1
23.0
22.5
September
22.8
23.5
22.6
23.0
23.3
October
22.9
22.5
22.1
23.5
23.6
November
23.3
23.6
23.6
23.3
23.6
December
23.2
24.1
23.6
22.3
23.6
Average
23.1
23.5
23.5
23.1
22.9
23.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
20.5
18
22
13
16
18
February
19.7
12
8
22
32
15
March
15.5
18
16
13
12
13
April
10.6
10
5
9
4
May
8.1
6
7
2
10
8
June
11.8
8
17
8
5
7
July
10.6
8
9
12
9
August
7.8
13
3
11
8
September
7.7
3
3
8
13
October
8.5
8
5
7
7
November
10.7
11
9
9
9
December
12.9
11
6
10
16
Average
12.3
12.6
11.0
7.9
11.7
10.3
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
4.5
3
4
4
4
5
February
5.1
4
6
4
4
6
March
4.8
4
5
4
5
4
April
4.8
5
4
5
5
May
4.0
3
4
5
3
4
June
4.0
4
4
4
4
4
July
5.1
6
6
4
5
August
6.0
5
8
5
4
September
5.1
6
6
4
4
October
4.3
4
5
4
4
November
4.1
4
4
3
4
December
4.6
4
4
4
5
Average
4.6
3.8
4.6
4.8
4.1
4.5
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
343°
358°
270°
309°
287°
February
357°
021°
304°
308°
289°
March
012°
034°
321°
306°
319°
April
018°
295°
295°
298°
May
008°
030°
163°
344°
289°
June
037°
150°
053°
049°
242°
July
163°
170°
082°
225°
August
164°
168°
130°
290°
September
157°
168°
014°
290°
October
346°
142°
041°
306°
November
041°
349°
321°
294°
December
292°
343°
274°
278°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.