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
67.4
64
89
72
83
74
February
86.6
98
88
97
86
March
94.5
97
98
98
91
April
96.8
99
94
97
96
May
97.2
99
95
99
99
June
96.7
99
98
99
100
July
99.0
100
100
100
99
August
97.0
100
97
92
97
September
96.7
92
98
94
99
October
92.1
94
99
86
92
November
78.5
77
93
63
77
December
74.3
73
87
91
61
Average
88.5
64.2
94.3
94.1
92.7
91.1
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
5.2
7.5
6.5
8.5
4.7
6.5
February
10.0
15.1
8.6
10.9
10.8
March
13.5
16.6
14.5
11.4
11.0
April
18.2
21.3
15.0
16.8
14.8
May
22.6
23.3
21.5
25.1
22.3
June
27.8
29.6
25.6
29.6
28.8
July
29.9
32.0
30.6
31.0
31.1
August
30.5
33.3
29.6
30.1
28.3
September
25.2
25.5
28.0
22.3
24.6
October
19.9
19.8
23.1
20.1
15.9
November
12.1
10.0
12.9
12.5
12.0
December
7.3
5.7
10.0
8.0
6.2
Average
17.4
7.5
19.9
19.0
18.9
17.7
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
-2.7
-0.0
-1.3
2.5
-2.3
1.3
February
1.1
5.2
0.0
1.7
0.8
March
3.4
6.5
4.0
0.6
1.3
April
7.3
9.6
5.7
6.0
5.2
May
12.3
13.9
12.0
13.0
11.5
June
17.0
18.6
16.3
17.5
16.6
July
18.3
20.3
19.0
18.1
19.8
August
18.4
20.3
18.3
18.6
16.8
September
13.7
14.4
15.9
13.0
12.9
October
9.3
9.5
11.4
9.5
7.4
November
4.7
1.3
4.7
5.4
4.9
December
1.2
0.8
1.9
2.6
1.1
Average
7.9
-1.9
10.0
9.3
8.9
8.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
14.7
11
11
19
12
22
February
9.1
4
9
6
6
March
8.8
9
8
7
15
April
7.4
6
13
5
13
May
6.6
8
11
2
6
June
4.2
4
7
2
2
July
2.1
3
0
1
1
August
2.7
1
3
5
6
September
5.8
13
3
10
5
October
5.6
5
3
1
17
November
11.8
8
19
11
14
December
14.6
14
8
13
27
Average
7.5
10.7
6.7
7.9
5.2
10.0
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
6.8
6
7
8
7
8
February
7.6
8
7
7
7
March
7.7
8
8
7
7
April
7.8
8
8
8
7
May
7.5
9
8
6
8
June
6.2
6
6
6
6
July
6.3
6
6
7
7
August
6.0
6
6
6
6
September
7.0
8
7
7
7
October
6.7
6
7
6
9
November
7.3
6
8
6
8
December
7.3
6
6
9
8
Average
6.8
5.5
7.2
7.0
6.6
7.2
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
195°
251°
201°
273°
202°
February
192°
301°
283°
308°
March
148°
267°
340°
314°
April
213°
324°
295°
282°
May
133°
120°
037°
274°
June
203°
308°
340°
317°
July
325°
287°
312°
313°
August
002°
100°
286°
323°
September
153°
100°
261°
252°
October
136°
182°
148°
113°
November
289°
207°
120°
145°
December
274°
216°
121°
269°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.