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
94.9
96
97
91
95
93
February
94.9
96
97
91
99
99
March
95.6
97
97
97
87
95
April
95.4
94
94
92
99
May
93.9
93
92
95
93
94
June
92.2
91
100
86
91
97
July
96.9
89
99
100
100
August
95.7
92
95
92
99
September
93.0
84
97
89
97
October
93.5
88
97
95
92
November
95.8
96
97
99
95
December
95.1
93
95
97
94
Average
94.8
94.7
93.2
94.5
93.9
96.2
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
30.6
32.2
32.2
29.0
30.8
28.8
February
30.6
31.3
32.1
29.1
31.8
30.3
March
30.9
31.6
32.5
30.1
29.6
31.0
April
29.5
31.0
28.3
29.8
29.6
May
27.6
28.5
28.1
27.6
25.6
28.5
June
26.8
26.3
30.0
25.6
26.3
25.8
July
27.9
28.0
28.6
29.8
26.8
August
29.4
30.3
31.1
27.8
30.8
September
32.5
34.6
32.6
28.6
34.2
October
31.8
33.2
34.0
29.8
30.8
November
31.3
31.3
33.8
30.1
31.1
December
31.1
30.6
33.2
30.6
31.5
Average
30.0
30.0
31.1
30.3
29.2
29.9
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
21.1
22.3
22.8
21.1
21.6
20.8
February
21.0
21.8
22.5
20.3
21.3
19.5
March
21.2
21.6
23.3
21.3
21.3
21.0
April
19.8
21.6
19.5
19.8
20.1
May
17.6
18.1
18.3
17.8
15.4
18.0
June
16.5
16.6
19.1
14.4
15.9
15.8
July
15.9
16.1
17.3
18.1
14.3
August
17.6
18.3
20.1
16.1
18.1
September
20.2
21.8
21.3
18.1
21.5
October
20.8
23.0
23.3
19.8
20.6
November
20.7
22.6
23.6
18.8
21.6
December
21.2
21.8
22.8
22.1
21.8
Average
19.5
20.1
20.9
20.2
18.9
19.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
4.9
3
3
6
4
11
February
4.1
3
4
8
2
2
March
3.0
2
3
2
8
3
April
3.2
4
4
4
2
May
2.6
3
1
4
3
1
June
3.0
5
0
5
3
3
July
1.0
2
1
0
1
August
3.0
7
1
5
0
September
2.5
0
2
6
2
October
2.2
4
1
3
2
November
2.4
3
2
2
4
December
4.6
6
3
4
4
Average
3.1
3.1
3.0
3.3
3.6
2.9
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
8.0
8
8
9
8
8
February
7.6
8
8
9
7
7
March
7.5
7
8
8
8
8
April
7.7
8
7
8
8
May
8.2
9
9
8
8
8
June
8.9
9
10
8
9
9
July
9.3
8
10
10
10
August
10.0
11
9
10
10
September
9.5
10
10
10
9
October
9.1
9
11
9
9
November
8.8
8
10
9
8
December
7.9
8
8
8
8
Average
8.5
8.0
8.8
8.7
8.7
8.5
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
305°
316°
332°
332°
335°
February
359°
326°
328°
352°
306°
March
046°
358°
005°
340°
330°
April
008°
024°
036°
083°
May
041°
355°
057°
019°
035°
June
015°
008°
036°
045°
047°
July
069°
036°
024°
073°
August
042°
011°
067°
041°
September
039°
003°
065°
017°
October
020°
341°
355°
043°
November
352°
335°
100°
017°
December
316°
343°
323°
021°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.