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
81.0
80
93
82
84
63
February
90.9
87
93
87
97
85
March
92.7
92
93
90
98
90
April
95.5
100
91
97
94
May
95.7
96
98
99
95
June
97.4
95
99
98
97
July
97.4
98
100
96
94
August
97.1
98
96
97
92
September
96.8
97
100
98
94
October
93.5
96
90
98
95
November
84.2
76
91
89
87
December
85.8
83
86
55
84
Average
92.8
87.0
94.2
93.5
94.7
90.6
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
4.5
5.5
4.4
6.0
5.2
2.7
February
6.8
4.9
10.3
6.5
8.5
5.0
March
10.4
12.0
12.3
10.0
10.8
9.4
April
14.5
16.1
11.9
12.9
11.0
May
19.2
21.1
19.0
21.1
16.1
June
25.0
23.1
25.3
26.1
25.6
July
25.4
25.5
26.1
25.8
24.6
August
25.7
27.1
24.3
26.8
22.0
September
21.0
22.1
24.3
19.0
20.6
October
15.8
15.5
16.5
18.0
14.9
November
8.6
7.9
8.5
9.5
7.9
December
5.6
5.5
6.7
-1.9
4.9
Average
14.4
7.5
15.9
15.5
15.8
13.7
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
-1.7
0.3
-2.5
2.0
1.1
-2.8
February
0.0
-2.1
4.2
0.2
1.9
-3.6
March
1.5
1.0
3.0
2.5
-1.8
1.5
April
4.3
6.9
3.6
3.3
1.9
May
8.6
11.1
7.5
9.5
7.5
June
13.6
13.0
13.1
13.1
15.0
July
14.4
14.8
14.5
14.0
15.0
August
15.0
15.6
15.4
15.5
13.1
September
11.1
12.4
12.9
9.9
11.9
October
8.0
7.7
9.3
9.0
6.5
November
3.0
2.7
3.5
3.0
3.2
December
0.9
1.1
2.2
-4.1
0.1
Average
6.0
-1.8
7.6
7.2
6.7
6.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
20.4
13
10
19
24
36
February
13.0
10
11
13
15
22
March
14.8
5
12
24
3
15
April
10.6
11
15
13
13
May
9.8
13
4
8
24
June
6.7
9
10
5
7
July
8.3
11
10
8
8
August
8.5
3
14
6
17
September
8.3
8
2
17
6
October
12.8
10
18
8
10
November
14.1
15
24
11
17
December
18.4
13
31
24
18
Average
11.2
9.0
10.2
14.1
10.4
15.0
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
11.1
11
13
12
12
9
February
11.0
8
12
11
16
9
March
10.1
7
10
11
8
10
April
9.6
10
9
10
10
May
8.8
8
9
9
11
June
8.0
8
7
8
6
July
8.3
8
10
8
8
August
7.9
8
8
7
8
September
8.2
10
6
8
7
October
9.8
9
10
9
9
November
9.3
10
11
9
9
December
10.4
10
13
7
9
Average
9.1
8.4
9.2
9.5
9.0
8.7
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
224°
232°
226°
255°
243°
February
128°
236°
260°
238°
194°
March
333°
177°
236°
080°
257°
April
233°
360°
321°
301°
May
115°
038°
276°
246°
June
266°
356°
277°
299°
July
245°
243°
290°
252°
August
264°
239°
006°
258°
September
347°
196°
243°
260°
October
204°
228°
211°
215°
November
231°
229°
181°
231°
December
222°
233°
249°
224°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.