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
73.8
63
81
75
70
79
February
83.8
79
79
76
88
84
March
87.9
91
87
80
92
92
April
90.8
98
78
92
92
May
91.1
95
80
88
94
95
June
93.2
89
97
95
91
July
92.1
90
84
96
91
August
91.7
87
85
94
92
September
91.4
89
90
89
94
October
87.4
80
85
91
86
November
79.1
65
81
87
70
December
69.4
56
70
67
69
Average
87.3
83.4
83.2
82.7
89.2
87.8
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
6.0
5.5
6.2
7.5
6.7
5.5
February
8.6
7.5
11.0
9.1
9.8
8.3
March
11.4
13.9
13.0
11.0
13.5
11.0
April
14.3
15.1
13.3
14.5
11.4
May
19.0
20.6
20.5
19.1
21.0
16.3
June
22.8
20.8
26.1
23.1
24.3
July
23.6
23.3
23.6
24.6
22.5
August
24.4
25.0
23.1
26.8
21.1
September
20.8
20.8
23.6
20.1
21.1
October
16.3
16.0
16.8
18.3
15.8
November
10.4
9.8
10.1
12.0
9.5
December
7.4
7.7
8.5
3.5
7.7
Average
15.1
12.0
15.7
16.0
16.6
14.5
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
0.6
2.7
1.9
0.8
February
1.9
0.7
5.5
1.6
2.9
1.0
March
2.9
1.3
5.2
3.7
1.5
2.1
April
4.5
6.9
4.2
4.2
1.1
May
8.3
8.0
10.9
8.3
8.5
6.5
June
12.5
11.3
13.6
11.5
13.0
July
13.1
13.5
13.5
12.4
13.8
August
13.6
15.1
13.5
14.0
12.6
September
10.5
11.5
12.8
10.1
11.0
October
8.6
8.1
9.8
9.4
7.5
November
4.0
3.5
4.7
5.7
2.6
December
2.8
3.3
4.5
-2.6
2.9
Average
6.6
2.7
8.0
7.7
7.0
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
25.3
26
30
32
20
18
February
23.0
14
38
14
36
14
March
22.4
3
26
51
4
14
April
19.2
35
27
22
15
May
16.3
14
28
19
11
31
June
13.5
24
8
22
11
July
17.9
27
31
8
20
August
15.2
16
30
7
21
September
18.6
25
12
36
9
October
22.0
17
39
17
25
November
22.4
25
37
16
14
December
27.4
24
44
17
18
Average
18.3
13.7
26.2
28.9
17.7
17.8
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
9.0
8
10
10
8
8
February
9.7
7
10
8
13
8
March
8.6
6
8
10
7
9
April
8.4
10
8
10
8
May
7.2
8
6
7
7
9
June
7.0
7
7
7
6
July
7.4
7
9
7
7
August
6.9
7
7
6
7
September
7.0
7
6
6
6
October
8.0
6
8
8
8
November
7.8
7
10
8
7
December
8.9
9
11
6
8
Average
7.8
7.5
7.7
8.4
7.5
7.6
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
209°
226°
221°
235°
226°
February
143°
209°
255°
226°
145°
March
006°
215°
226°
077°
256°
April
236°
264°
355°
345°
May
288°
243°
008°
251°
231°
June
255°
017°
257°
321°
July
244°
225°
281°
243°
August
224°
241°
347°
254°
September
203°
195°
221°
202°
October
190°
205°
207°
198°
November
219°
216°
190°
220°
December
225°
227°
109°
204°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.