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
96.7
97
89
97
99
96
February
97.4
96
95
99
96
99
March
96.5
98
97
92
98
96
April
96.5
97
97
93
99
May
93.1
94
85
94
99
91
June
94.4
98
95
97
99
99
July
94.2
93
98
99
84
August
95.8
100
97
90
97
September
93.8
82
98
96
90
October
95.8
98
96
93
95
November
95.2
98
83
100
98
December
96.5
93
94
97
92
Average
95.3
96.5
93.2
95.4
96.4
94.0
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
6.8
6.4
6.5
7.2
8.8
4.5
February
7.9
8.4
8.0
9.1
7.4
6.7
March
9.2
11.0
8.9
7.4
11.0
9.6
April
11.1
10.9
11.0
10.8
9.5
May
14.5
14.8
16.3
14.5
14.8
11.5
June
17.1
18.1
15.5
19.6
17.3
18.1
July
18.3
16.8
17.6
18.8
18.3
August
18.2
18.8
18.1
18.6
17.5
September
16.0
14.5
17.6
16.1
17.5
October
13.2
15.9
12.3
14.1
13.4
November
9.6
10.0
8.8
11.1
10.3
December
7.3
8.5
7.0
5.5
7.0
Average
12.4
11.7
12.6
12.5
13.1
12.0
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
0.5
0.7
1.7
3.1
-1.6
February
1.5
1.3
1.8
3.2
1.8
0.8
March
2.4
4.0
3.2
1.8
1.5
3.2
April
3.9
5.0
3.7
3.7
1.6
May
7.0
6.4
9.5
7.0
7.4
5.9
June
9.5
9.9
9.3
10.3
7.9
9.8
July
11.3
10.5
11.0
10.3
13.0
August
10.9
10.5
11.8
9.6
11.6
September
9.2
8.3
9.5
10.0
10.5
October
6.6
6.2
6.5
7.7
7.0
November
3.6
3.2
2.2
4.7
5.0
December
2.1
3.5
1.7
0.4
1.5
Average
5.7
4.4
6.0
5.9
5.8
5.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
23.2
21
36
32
10
28
February
20.1
10
27
15
38
15
March
21.2
14
19
40
11
13
April
18.3
36
16
24
16
May
17.2
8
13
16
30
25
June
14.8
14
25
12
11
7
July
20.0
26
33
18
13
August
17.1
17
19
14
12
September
21.8
30
16
24
11
October
23.1
15
32
16
26
November
25.1
21
37
16
23
December
21.7
22
31
41
11
Average
19.0
12.6
23.6
23.6
19.9
15.6
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
11.5
10
13
13
13
10
February
12.6
11
12
12
15
14
March
11.6
12
11
10
10
13
April
10.9
12
10
10
11
May
9.6
9
9
9
11
9
June
10.0
11
12
8
10
10
July
9.1
9
10
10
8
August
9.7
12
9
10
8
September
10.5
9
10
12
9
October
11.4
11
14
11
11
November
11.1
11
10
11
14
December
10.7
12
11
11
9
Average
10.5
10.7
10.7
10.2
10.9
10.0
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
269°
243°
248°
249°
261°
February
184°
243°
251°
247°
170°
March
259°
144°
329°
180°
249°
April
277°
086°
027°
320°
May
324°
075°
285°
252°
046°
June
250°
276°
104°
214°
254°
July
296°
279°
280°
033°
August
228°
268°
253°
018°
September
309°
226°
308°
235°
October
214°
175°
221°
236°
November
249°
323°
165°
270°
December
262°
210°
302°
233°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.