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
84.5
93
79
82
89
79
February
93.8
97
97
97
97
95
March
97.9
97
98
100
98
95
April
98.2
99
100
98
97
May
99.4
99
100
98
100
100
June
99.7
100
100
99
100
100
July
99.9
100
100
100
100
August
99.9
100
100
100
100
September
99.5
100
100
100
100
October
96.7
92
98
95
97
November
89.9
88
89
94
95
December
81.5
83
82
84
84
Average
90.4
97.6
95.3
96.0
97.1
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
11.6
12.5
13.4
10.5
12.3
9.6
February
15.3
15.4
14.9
13.9
15.8
15.8
March
16.3
14.4
16.3
19.3
13.6
17.8
April
19.8
21.3
25.0
17.1
18.6
May
25.7
25.0
26.0
24.1
27.6
25.1
June
31.0
35.1
30.6
29.3
32.1
30.0
July
35.9
37.1
36.2
37.2
34.2
August
34.8
36.2
35.7
34.7
34.7
September
27.9
28.1
28.1
28.1
27.5
October
23.3
21.6
24.6
25.3
23.3
November
15.7
17.0
16.5
17.3
13.3
December
12.0
12.1
11.4
13.3
12.6
Average
20.7
20.6
22.2
22.9
23.2
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
1.3
2.2
3.7
1.3
-3.9
0.6
February
1.4
1.0
3.9
-1.0
0.7
4.0
March
4.7
5.7
5.4
4.2
5.7
3.3
April
6.6
6.2
7.2
5.2
7.5
May
10.4
9.9
10.4
10.1
10.5
10.1
June
15.3
15.6
15.8
16.6
15.1
14.6
July
18.7
19.0
19.1
19.1
17.0
August
18.0
20.0
18.1
18.3
17.8
September
14.1
14.5
14.8
13.5
14.5
October
10.2
11.3
11.8
11.3
9.1
November
5.7
7.4
6.5
6.2
2.7
December
3.0
-1.7
1.5
6.5
3.3
Average
9.0
7.1
9.2
9.2
9.3
9.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
4.0
5
3
4
0
13
February
2.3
2
6
1
2
2
March
5.9
12
12
1
11
0
April
4.6
1
1
7
6
May
2.1
1
0
7
1
2
June
1.1
1
1
5
0
1
July
0.0
0
0
0
0
August
0.2
1
0
1
0
September
1.8
2
2
0
3
October
4.0
6
4
3
4
November
4.5
5
3
5
1
December
5.1
1
1
18
4
Average
8.7
3.9
3.2
2.4
3.2
2.5
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
5.4
7
4
6
4
6
February
5.3
4
8
6
4
7
March
7.2
7
8
7
8
6
April
6.2
6
6
7
6
May
6.1
5
7
6
6
6
June
5.9
5
6
5
6
5
July
6.0
6
7
5
7
August
5.4
5
6
5
6
September
5.4
6
5
6
5
October
5.5
7
6
5
5
November
6.1
5
7
6
5
December
5.5
4
4
6
6
Average
5.9
5.7
6.1
5.9
5.7
5.8
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
256°
250°
284°
063°
266°
February
270°
273°
061°
019°
265°
March
204°
248°
271°
074°
045°
April
286°
288°
284°
293°
May
285°
279°
003°
279°
268°
June
267°
257°
270°
252°
253°
July
276°
265°
274°
270°
August
271°
290°
263°
270°
September
283°
268°
261°
273°
October
248°
248°
195°
274°
November
050°
261°
256°
291°
December
353°
276°
238°
257°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.