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
79.7
70
91
86
83
89
February
83.3
85
81
82
91
80
March
90.1
94
90
83
96
91
April
94.5
96
86
97
96
May
93.7
89
93
98
95
June
94.7
95
99
97
87
July
94.8
98
93
98
89
August
97.0
98
96
98
96
September
93.9
95
93
97
94
October
91.5
91
87
94
92
November
84.6
80
86
89
82
December
73.5
59
73
86
65
Average
90.1
84.2
90.4
89.3
94.9
89.4
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
6.9
6.2
7.0
8.0
7.5
6.0
February
8.4
7.2
10.4
8.9
9.5
7.5
March
11.0
12.6
12.1
9.9
12.8
10.0
April
13.9
14.0
12.5
13.6
10.6
May
18.2
19.6
17.6
18.8
15.3
June
21.9
19.5
24.5
21.5
22.3
July
22.4
21.8
22.0
23.1
21.3
August
22.9
23.8
21.6
25.1
20.3
September
19.9
20.1
22.6
19.6
21.0
October
15.8
15.6
16.3
17.1
15.4
November
10.5
10.4
10.6
11.5
10.4
December
7.9
8.3
8.9
4.4
8.1
Average
14.3
8.7
15.2
15.3
15.8
14.0
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
2.2
1.3
1.8
3.9
3.3
1.3
February
2.7
1.1
6.2
2.7
4.4
1.5
March
3.6
2.0
5.9
4.0
3.0
3.2
April
5.4
7.2
5.2
5.0
2.3
May
9.0
11.5
8.6
9.3
7.4
June
12.9
11.8
13.8
12.5
13.3
July
14.0
14.4
14.6
13.4
14.3
August
14.5
15.3
14.3
14.8
13.9
September
11.6
12.4
13.6
11.3
12.4
October
9.6
9.1
11.0
10.3
9.4
November
5.2
4.5
6.4
6.0
5.2
December
3.5
4.5
5.0
-2.6
3.6
Average
7.2
1.5
8.7
8.6
7.9
7.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
17.5
17
20
18
17
14
February
16.8
12
24
13
22
11
March
13.4
5
18
30
2
9
April
12.8
27
14
9
14
May
10.9
19
8
9
21
June
8.2
12
3
11
10
July
11.3
16
17
7
8
August
10.6
9
17
5
14
September
16.5
22
11
24
6
October
20.3
11
24
11
26
November
22.0
19
35
20
22
December
22.9
26
24
17
22
Average
13.9
10.6
17.8
16.4
11.5
14.0
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
10.1
9
11
12
9
10
February
11.3
9
12
9
16
10
March
10.2
7
9
11
8
10
April
9.1
11
9
10
9
May
8.0
8
8
8
9
June
7.9
8
8
7
6
July
8.0
8
10
7
8
August
7.9
8
8
7
9
September
7.9
9
7
7
7
October
9.5
8
10
9
10
November
9.2
8
12
10
8
December
10.1
11
12
7
9
Average
8.9
8.2
8.9
9.5
8.5
8.6
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
206°
231°
228°
249°
227°
February
135°
215°
257°
234°
145°
March
027°
196°
225°
094°
254°
April
237°
034°
025°
348°
May
251°
022°
271°
239°
June
262°
031°
267°
333°
July
244°
242°
281°
266°
August
225°
255°
006°
266°
September
176°
180°
228°
207°
October
184°
203°
207°
204°
November
206°
215°
185°
237°
December
225°
224°
132°
202°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.