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
68.7
61
77
74
62
58
February
84.7
86
77
80
90
87
March
90.0
91
93
88
95
89
April
93.7
97
88
96
90
May
93.3
86
91
97
96
June
94.7
92
97
97
90
July
94.3
95
95
97
90
August
93.1
94
90
96
89
September
93.1
90
94
94
94
October
92.2
87
95
95
94
November
81.0
67
85
90
70
December
72.4
64
75
56
68
Average
88.4
80.4
86.8
89.0
91.7
86.4
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
5.6
4.9
5.5
6.7
6.2
4.7
February
8.5
7.0
10.1
8.5
9.4
8.6
March
11.7
13.4
12.5
10.5
13.4
10.8
April
14.7
14.5
12.9
14.1
11.3
May
19.1
19.5
18.6
21.1
16.0
June
23.3
20.3
25.8
23.1
23.8
July
23.9
22.8
23.1
25.0
22.0
August
23.9
24.3
22.1
26.6
20.6
September
20.5
20.1
23.5
19.3
21.0
October
16.1
15.9
16.6
18.3
15.4
November
10.0
9.5
9.5
11.6
8.5
December
7.0
6.7
8.3
3.2
7.4
Average
14.7
8.4
15.2
15.5
16.4
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
1.2
0.7
0.5
2.7
1.6
0.9
February
2.2
1.1
5.7
2.0
2.7
2.1
March
3.6
3.1
6.0
3.6
2.3
3.0
April
5.0
7.2
4.4
4.7
1.5
May
8.9
11.3
8.5
9.5
6.9
June
13.2
11.9
14.4
12.5
14.4
July
14.0
14.4
14.4
13.5
14.1
August
14.5
15.5
14.0
15.0
13.0
September
11.2
11.8
13.4
11.0
11.5
October
9.2
9.3
10.4
10.5
7.7
November
4.5
4.2
5.2
6.7
3.2
December
2.8
2.5
4.5
-2.5
3.3
Average
6.9
1.6
8.3
8.1
7.7
6.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
21.0
18
23
32
15
22
February
16.9
6
28
16
27
8
March
16.8
3
18
35
4
17
April
14.0
26
20
11
17
May
13.0
23
8
8
27
June
9.7
15
2
12
12
July
11.6
15
18
4
22
August
12.6
7
21
5
24
September
15.0
18
7
29
9
October
17.4
12
18
13
17
November
17.1
12
29
11
17
December
23.1
25
29
16
18
Average
14.3
7.9
18.0
18.0
11.8
17.7
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
9.8
9
11
12
8
9
February
10.8
9
12
8
14
11
March
9.3
7
9
11
7
9
April
8.3
10
9
9
7
May
7.4
7
8
7
10
June
7.3
7
7
7
6
July
7.2
7
9
6
7
August
7.0
7
7
7
7
September
7.5
8
7
7
7
October
9.2
7
10
9
10
November
8.8
8
12
10
8
December
10.0
10
12
6
9
Average
8.3
8.1
8.3
8.9
7.8
8.2
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
211°
224°
222°
232°
224°
February
148°
215°
256°
227°
168°
March
028°
205°
224°
083°
247°
April
228°
042°
038°
349°
May
227°
027°
256°
225°
June
245°
049°
245°
281°
July
230°
231°
281°
243°
August
227°
236°
022°
252°
September
209°
199°
224°
194°
October
185°
208°
208°
206°
November
214°
217°
204°
222°
December
218°
221°
128°
206°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.