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
73.2
65
82
74
76
83
February
76.5
64
73
85
74
March
82.2
72
75
84
88
April
90.8
91
81
91
98
May
90.1
83
86
91
93
June
91.1
94
91
95
79
July
91.6
91
88
92
86
August
94.5
93
93
96
94
September
90.8
92
93
93
94
October
83.2
74
78
84
85
November
73.9
66
82
70
69
December
62.1
52
61
67
54
Average
83.6
65.3
81.4
82.4
86.9
84.9
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
6.1
5.9
5.9
7.4
7.2
5.2
February
7.3
9.3
8.4
8.5
5.7
March
9.5
10.6
8.9
11.3
8.9
April
12.7
13.1
11.9
12.4
9.6
May
16.8
19.8
15.8
17.0
13.5
June
20.1
18.5
22.1
19.8
21.0
July
21.2
20.8
21.1
21.1
21.8
August
21.9
22.8
20.6
23.8
19.6
September
19.0
19.6
21.6
18.8
19.6
October
14.8
14.9
15.0
16.0
14.5
November
9.8
9.5
10.1
10.5
9.8
December
7.0
8.0
7.9
4.0
6.7
Average
13.0
5.8
14.4
14.2
14.5
13.0
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
1.7
0.9
1.5
3.2
3.2
0.3
February
2.0
5.0
1.9
3.3
-1.8
March
2.8
5.0
3.2
1.9
2.3
April
4.4
6.0
4.0
4.2
1.7
May
8.0
10.5
7.7
7.5
6.7
June
11.8
11.1
12.0
11.0
12.0
July
13.5
13.5
13.9
12.9
14.9
August
13.9
14.5
13.0
13.8
14.0
September
11.3
11.9
12.6
11.1
12.1
October
9.1
8.4
10.0
10.0
8.5
November
4.7
4.0
5.2
5.4
5.9
December
2.9
4.2
3.9
-2.8
2.0
Average
6.5
0.8
8.0
7.6
7.2
6.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
21.4
37
22
25
13
17
February
20.4
26
12
35
15
March
15.5
14
28
13
11
April
13.8
29
16
17
12
May
9.7
14
10
15
18
June
11.1
15
8
17
6
July
14.6
23
27
12
8
August
11.3
11
15
8
14
September
16.8
24
16
29
6
October
18.8
14
32
15
17
November
25.3
29
50
22
13
December
22.2
25
25
22
19
Average
17.2
37.1
20.0
21.3
17.4
12.2
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
11.5
11
12
13
12
10
February
12.3
12
11
17
10
March
11.6
11
13
9
12
April
11.1
13
11
13
11
May
9.2
8
9
10
10
June
9.0
10
9
9
8
July
9.2
9
11
9
8
August
8.9
9
9
8
10
September
8.7
10
8
8
8
October
10.2
9
11
10
10
November
9.8
9
12
10
9
December
10.6
12
12
8
10
Average
10.1
11.3
10.2
10.6
10.0
9.5
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
213°
242°
231°
262°
234°
February
221°
270°
243°
137°
March
231°
237°
079°
264°
April
251°
007°
303°
348°
May
079°
013°
272°
261°
June
273°
352°
270°
347°
July
251°
244°
286°
295°
August
231°
264°
347°
291°
September
217°
200°
288°
237°
October
189°
223°
210°
211°
November
232°
215°
184°
238°
December
228°
244°
160°
210°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.