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
98
98
98
100
99
February
98.7
99
94
100
100
99
March
98.5
98
96
99
98
100
April
98.8
98
100
99
100
May
99.2
100
100
98
99
100
June
99.6
99
99
99
100
100
July
99.8
100
100
100
100
August
99.7
100
100
100
100
September
99.5
100
99
98
100
October
98.7
97
99
100
100
November
98.0
100
100
97
99
December
98.5
100
100
90
100
Average
99.0
98.9
98.4
99.2
98.8
99.6
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
12.9
13.8
14.3
13.0
13.0
11.1
February
14.7
14.6
16.1
13.8
14.8
14.3
March
16.5
16.8
17.0
17.1
15.4
15.9
April
19.4
20.1
18.3
18.1
17.1
May
23.4
25.3
23.6
22.8
25.3
21.6
June
29.2
31.0
28.3
28.3
31.1
28.6
July
32.0
33.2
31.8
34.0
30.8
August
32.2
33.7
31.3
32.2
31.3
September
27.4
26.8
28.1
26.3
29.1
October
23.0
22.1
25.8
23.3
22.3
November
17.6
18.3
17.6
17.8
17.8
December
14.0
13.3
14.9
14.3
14.0
Average
21.7
20.3
22.3
21.9
22.4
21.2
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
3.5
5.5
4.7
5.0
3.3
3.2
February
4.0
6.0
6.2
3.3
3.5
4.2
March
5.3
7.2
8.4
6.5
3.5
3.2
April
7.2
8.3
7.0
6.7
5.7
May
11.8
11.8
12.4
12.6
12.8
9.6
June
16.2
17.6
16.3
16.8
17.6
15.4
July
18.8
19.3
20.6
19.3
17.3
August
19.4
21.0
19.0
20.0
18.1
September
15.7
16.3
15.8
15.5
16.6
October
12.3
14.4
14.4
13.0
11.0
November
8.3
6.9
7.9
8.0
9.6
December
4.6
3.3
5.4
7.4
4.5
Average
10.5
9.6
11.5
11.2
11.0
9.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
7.0
9
6
7
5
16
February
6.4
7
13
2
2
4
March
6.6
10
10
4
6
1
April
6.1
4
6
3
7
May
5.1
1
6
8
2
3
June
0.8
0
1
1
0
1
July
0.4
1
0
0
0
August
1.0
0
3
1
0
September
1.8
4
1
2
0
October
4.5
12
5
2
2
November
7.2
1
2
9
7
December
8.1
5
2
19
10
Average
4.2
4.7
4.9
3.4
3.1
3.7
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
7.3
9
7
7
7
8
February
7.6
6
7
7
7
8
March
8.5
8
8
8
8
8
April
7.8
7
8
9
8
May
7.2
7
7
7
7
8
June
7.5
8
7
7
8
7
July
8.0
7
8
8
9
August
7.8
7
8
8
8
September
7.4
8
8
7
7
October
6.9
6
8
5
9
November
6.9
6
8
7
7
December
6.8
6
6
7
7
Average
7.5
7.7
7.0
7.5
7.5
7.7
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
088°
042°
023°
031°
074°
February
075°
134°
050°
029°
116°
March
104°
165°
150°
065°
022°
April
191°
333°
151°
128°
May
227°
214°
325°
215°
190°
June
220°
216°
234°
215°
231°
July
234°
215°
240°
207°
August
232°
223°
258°
217°
September
188°
019°
180°
224°
October
154°
182°
159°
045°
November
040°
312°
025°
060°
December
029°
051°
099°
050°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.