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
95.8
100
98
91
96
94
February
95.4
100
80
93
100
99
March
93.3
93
100
96
88
89
April
95.9
93
93
99
98
May
94.1
95
89
98
95
June
91.2
95
92
82
90
July
89.0
84
91
84
97
August
88.9
97
77
94
94
September
93.5
85
93
96
91
October
93.7
94
100
89
87
November
98.5
100
96
98
100
December
97.3
100
88
100
99
Average
94.0
97.3
93.1
91.2
93.1
94.2
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
4.2
4.2
4.2
3.6
3.1
3.2
February
5.7
4.5
5.0
6.2
4.0
7.4
March
11.3
10.0
9.8
12.6
10.9
11.6
April
17.1
18.3
16.6
18.6
15.8
May
21.7
22.3
21.3
22.8
20.3
June
24.2
25.8
25.3
24.0
22.3
July
27.4
29.5
29.1
26.3
26.8
August
27.7
30.1
27.3
27.3
26.1
September
23.7
25.0
24.3
23.6
23.1
October
18.4
19.1
20.1
17.1
18.8
November
13.4
14.0
12.9
14.8
13.5
December
5.6
6.0
5.4
3.7
6.4
Average
15.7
6.4
17.4
17.1
16.8
16.3
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
-3.9
-3.9
-3.9
-3.5
-3.2
-4.2
February
-1.3
-3.3
0.3
0.4
-3.0
-1.8
March
4.6
3.5
2.7
5.9
4.2
5.5
April
9.6
11.3
9.5
10.5
9.1
May
14.2
14.3
13.8
14.5
13.1
June
18.1
19.6
19.0
18.1
16.8
July
22.2
24.3
23.1
21.8
22.0
August
22.0
24.3
21.8
20.6
21.3
September
17.6
19.8
18.8
17.1
17.6
October
12.0
12.9
13.0
11.4
12.5
November
6.4
7.0
5.4
7.7
6.7
December
-1.2
-1.6
-1.1
-3.2
-1.3
Average
9.2
-1.6
11.1
10.6
10.2
10.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
7.1
4
11
11
1
7
February
7.7
0
26
10
0
3
March
11.1
17
12
4
20
14
April
8.7
8
10
6
5
May
8.6
9
11
3
14
June
10.2
10
12
22
6
July
15.6
18
14
15
4
August
17.0
6
23
18
19
September
15.4
31
18
10
15
October
13.0
18
2
26
19
November
6.6
10
7
5
5
December
6.0
3
21
2
5
Average
10.4
7.5
13.3
12.1
11.1
9.9
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
9.8
11
10
11
8
9
February
9.4
12
7
9
11
10
March
8.5
9
9
8
9
8
April
8.4
7
10
9
8
May
7.8
8
7
9
8
June
6.2
6
7
7
6
July
6.0
8
6
6
5
August
5.5
6
6
6
5
September
5.7
5
5
6
5
October
6.3
6
7
7
6
November
8.1
8
10
7
9
December
10.5
12
10
11
11
Average
7.8
10.4
7.4
7.8
7.6
7.4
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
282°
282°
278°
292°
277°
February
279°
344°
303°
285°
280°
March
347°
303°
002°
271°
287°
April
075°
276°
211°
120°
May
268°
093°
247°
272°
June
110°
090°
142°
121°
July
266°
172°
094°
098°
August
112°
025°
168°
047°
September
048°
034°
087°
079°
October
059°
279°
047°
030°
November
287°
276°
278°
281°
December
276°
283°
284°
277°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.