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
74.3
64
83
87
71
68
February
86.9
86
86
75
94
82
March
91.3
93
87
87
97
92
April
95.8
96
94
95
95
May
95.7
92
95
100
95
June
97.0
97
99
98
96
July
95.7
98
93
98
90
August
96.3
96
93
97
96
September
94.0
92
95
96
93
October
90.3
84
89
92
92
November
79.1
75
85
81
71
December
69.5
61
70
74
59
Average
90.0
82.5
89.3
90.1
93.2
88.1
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
5.7
5.0
5.5
6.9
6.5
4.5
February
7.9
6.5
10.0
8.3
9.0
7.2
March
11.3
13.3
12.1
9.6
12.9
10.5
April
14.6
14.9
13.3
13.4
11.5
May
19.5
21.3
19.1
20.5
16.0
June
23.8
21.1
25.6
23.8
24.6
July
24.2
23.8
23.3
24.6
23.3
August
24.5
25.1
22.6
27.1
21.6
September
20.4
20.3
23.8
19.6
20.8
October
15.8
15.8
16.1
17.6
15.1
November
9.6
8.9
9.4
11.1
8.8
December
6.6
7.0
7.7
2.5
6.5
Average
14.6
8.3
15.5
15.5
16.2
14.2
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
1.1
0.6
0.5
3.2
2.7
0.4
February
1.4
0.8
5.4
1.3
2.9
-2.9
March
2.5
0.9
5.0
3.2
0.7
1.8
April
4.5
7.0
3.7
4.2
1.8
May
8.3
10.9
8.0
8.5
6.7
June
12.7
11.5
13.0
11.3
14.0
July
13.4
13.5
13.9
12.5
14.0
August
13.8
15.0
13.5
14.1
12.8
September
10.3
11.6
12.3
10.4
10.8
October
8.3
8.0
10.0
8.5
7.0
November
3.7
3.5
4.4
4.5
3.7
December
2.4
2.7
3.7
-3.9
2.2
Average
6.2
0.7
7.9
7.6
6.8
6.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
24.1
19
21
26
23
32
February
19.4
8
26
22
30
18
March
16.5
5
17
35
6
13
April
13.3
24
18
19
16
May
10.1
12
7
5
23
June
9.1
13
6
9
5
July
10.5
12
16
5
12
August
10.0
7
21
3
13
September
10.9
11
3
15
6
October
16.7
15
23
10
19
November
18.3
15
33
13
15
December
28.6
27
40
10
25
Average
14.0
9.7
15.5
18.7
11.1
15.2
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
8.1
8
9
9
8
7
February
8.4
6
9
8
13
6
March
7.8
6
7
9
6
8
April
7.6
8
7
9
8
May
6.7
6
7
7
8
June
6.5
7
6
7
6
July
6.8
7
8
7
6
August
6.5
6
6
6
7
September
6.3
6
5
6
5
October
7.3
6
8
6
7
November
6.7
7
9
7
6
December
7.6
9
10
4
6
Average
7.0
6.2
7.0
7.5
7.0
6.8
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
217°
234°
224°
245°
229°
February
124°
217°
254°
231°
153°
March
292°
207°
233°
083°
250°
April
228°
017°
321°
308°
May
175°
006°
255°
238°
June
254°
348°
265°
290°
July
237°
231°
279°
249°
August
229°
242°
324°
256°
September
236°
193°
239°
224°
October
201°
220°
205°
199°
November
223°
218°
189°
226°
December
226°
232°
150°
211°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.