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
95.9
91
99
95
95
97
February
93.8
92
87
97
95
96
March
93.1
86
99
86
95
April
90.8
85
93
88
92
May
88.2
86
95
83
77
June
88.1
92
80
83
93
July
91.1
93
90
89
92
August
85.9
73
84
88
94
September
90.0
95
84
93
87
October
93.9
96
95
97
98
November
94.0
98
90
97
94
December
94.7
92
92
99
95
Average
92.3
91.5
90.6
91.9
91.8
93.1
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
2021
January
15.7
17.6
16.3
17.3
14.1
15.3
February
15.0
13.8
15.5
15.8
14.5
16.1
March
12.8
11.5
13.8
11.1
14.0
April
10.3
9.8
9.8
9.8
12.0
May
7.3
5.5
8.9
7.0
6.0
June
4.8
2.2
5.0
5.0
6.0
July
4.6
4.7
4.2
3.6
6.0
August
6.0
4.9
5.9
6.4
7.0
September
8.1
8.6
5.7
9.5
10.0
October
10.9
11.6
11.5
11.8
11.9
November
13.3
13.4
12.0
16.1
13.0
December
14.3
13.4
13.0
14.4
16.3
Average
10.8
15.8
9.8
10.2
10.1
11.1
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
7.2
8.9
7.0
7.7
6.2
7.0
February
7.0
5.5
7.0
7.2
6.2
7.0
March
5.6
4.9
5.2
4.7
5.7
April
4.2
3.9
3.7
4.2
5.2
May
2.4
1.9
3.1
1.7
1.8
June
0.5
-2.6
0.7
0.2
1.1
July
0.3
0.2
0.1
-1.5
1.3
August
0.7
0.1
0.4
0.6
1.5
September
1.5
1.1
0.3
2.1
3.0
October
2.9
3.5
2.6
3.5
2.9
November
4.8
4.9
3.5
6.7
4.5
December
5.9
5.7
4.9
6.0
6.7
Average
4.0
7.3
3.2
3.3
3.3
4.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
17.7
13
17
9
22
13
February
20.5
30
21
17
16
11
March
21.8
27
15
30
20
April
26.5
26
26
28
12
May
33.0
50
25
39
42
June
31.8
41
28
33
22
July
28.9
33
28
37
29
August
30.2
42
29
22
21
September
26.0
30
34
19
21
October
21.4
20
17
19
14
November
15.2
14
20
4
15
December
18.1
22
24
13
9
Average
22.6
20.5
26.5
21.4
22.2
17.6
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
17.2
18
17
17
19
17
February
17.6
19
19
18
17
18
March
16.9
18
18
17
19
April
16.4
17
18
14
17
May
15.0
15
18
15
13
June
13.8
13
15
14
13
July
14.4
17
13
14
15
August
16.2
15
18
14
16
September
17.1
18
16
15
17
October
18.2
18
20
19
18
November
18.1
19
18
18
19
December
17.3
16
19
16
18
Average
17.0
18.4
16.8
17.4
16.2
17.0
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
295°
257°
276°
265°
267°
February
267°
302°
281°
270°
264°
March
283°
285°
281°
282°
April
282°
287°
279°
295°
May
253°
297°
296°
286°
June
243°
289°
295°
298°
July
287°
298°
297°
300°
August
294°
279°
292°
281°
September
294°
269°
297°
303°
October
274°
285°
275°
279°
November
293°
283°
299°
285°
December
272°
263°
274°
278°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.