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
January
92.3
91
88
94
97
February
96.8
96
92
100
100
March
93.3
92
96
93
93
April
97.8
98
100
97
May
99.7
100
100
100
100
June
99.8
100
100
100
100
July
100.0
100
100
100
August
100.0
100
100
100
September
98.6
98
99
99
October
95.6
95
94
98
November
93.2
97
90
93
December
91.8
100
90
82
Average
96.8
96.2
97.2
96.9
97.1
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
January
15.7
15.6
16.6
14.4
16.3
February
18.3
17.8
18.3
17.1
19.8
March
19.5
17.8
19.5
22.3
18.1
April
24.9
24.8
29.1
21.1
May
29.2
28.5
29.3
28.5
30.6
June
34.0
37.1
31.6
33.3
34.1
July
38.9
38.2
38.7
39.7
August
38.4
38.7
39.5
37.1
September
31.2
31.3
30.8
31.8
October
26.8
24.6
27.5
28.5
November
20.5
21.0
20.1
20.5
December
16.0
16.8
14.9
16.3
Average
25.5
23.4
25.9
26.4
26.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
January
3.6
4.2
4.9
3.0
2.7
February
4.7
4.7
6.2
3.2
4.7
March
7.8
8.0
8.3
6.4
8.5
April
8.9
9.3
8.8
8.8
May
12.7
12.9
11.6
13.5
13.0
June
17.8
18.6
17.0
18.1
17.6
July
20.0
19.1
20.1
20.6
August
20.2
21.3
19.5
19.8
September
16.1
16.1
15.8
16.3
October
14.4
14.8
13.8
14.5
November
8.8
10.1
7.4
9.0
December
4.6
3.1
3.2
9.4
Average
11.2
9.7
11.8
11.1
12.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
January
5.4
9
10
2
1
February
3.1
4
7
1
0
March
12.4
16
16
4
14
April
3.5
2
1
8
May
1.7
1
1
4
2
June
1.2
0
2
3
0
July
0.2
1
0
0
August
0.0
0
0
0
September
2.7
1
4
3
October
7.1
13
5
3
November
4.0
3
3
6
December
6.3
1
4
20
Average
4.1
5.4
4.3
2.5
4.0
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
January
5.1
5
5
5
5
February
4.9
4
5
6
4
March
5.8
6
7
4
6
April
5.5
5
5
6
May
5.1
5
5
5
5
June
5.3
5
6
5
6
July
5.3
6
6
5
August
5.2
5
5
6
September
5.2
6
5
5
October
5.3
6
5
5
November
4.7
5
5
5
December
4.9
5
4
6
Average
5.2
5.2
5.4
4.9
5.3
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
January
170°
121°
110°
075°
February
101°
238°
075°
080°
March
222°
222°
209°
056°
April
218°
211°
219°
May
239°
245°
228°
238°
June
236°
247°
239°
244°
July
246°
244°
233°
August
248°
240°
245°
September
243°
236°
239°
October
234°
221°
092°
November
079°
228°
244°
December
077°
078°
218°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.