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
83.3
81
94
92
76
82
February
92.3
97
99
95
96
93
March
95.3
95
96
99
96
April
97.2
98
99
94
99
May
98.2
99
99
99
99
June
95.8
96
97
94
95
July
93.5
79
99
99
83
August
91.8
96
97
96
77
September
97.6
96
100
99
98
October
95.5
91
98
96
98
November
88.8
83
95
94
81
December
74.3
68
79
85
59
Average
92.6
89.1
91.8
96.2
95.0
89.3
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
2.1
2.6
3.1
2.7
1.1
1.3
February
6.4
5.5
9.4
6.7
6.7
6.4
March
10.9
12.0
10.5
12.5
10.0
April
14.7
14.5
12.3
13.5
13.4
May
18.2
18.0
18.0
20.6
15.3
June
23.4
22.1
25.1
24.5
24.0
July
24.5
24.6
25.3
26.3
22.3
August
23.3
25.1
23.6
25.1
21.5
September
19.4
17.3
22.8
18.1
20.8
October
15.0
14.1
17.3
16.8
13.8
November
7.0
5.7
7.4
9.0
5.7
December
2.6
1.5
3.9
0.9
0.9
Average
12.9
4.0
13.9
14.6
15.1
12.9
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
-4.1
-4.7
-3.1
-3.2
-6.9
-4.2
February
-2.1
-2.3
1.3
-3.9
-2.3
-2.3
March
0.5
2.2
0.4
-1.4
-1.5
April
3.1
3.3
2.7
3.2
1.9
May
7.6
8.3
8.5
9.5
5.0
June
12.0
11.9
11.8
12.5
12.4
July
13.3
14.4
13.8
14.0
11.6
August
12.9
15.3
13.4
13.3
12.9
September
9.5
9.5
11.1
9.0
10.3
October
5.5
6.5
6.2
7.2
3.2
November
0.7
-1.4
1.1
1.3
0.2
December
-3.3
-4.7
-2.3
-4.2
-5.4
Average
3.9
-3.5
5.5
5.2
5.2
3.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
19.4
10
17
20
14
30
February
16.3
10
8
8
20
17
March
19.9
26
24
7
19
April
16.7
28
24
25
10
May
17.5
26
19
11
24
June
12.6
20
7
14
11
July
12.0
12
12
5
19
August
12.8
8
17
7
14
September
12.3
18
7
16
8
October
13.8
17
11
12
7
November
18.4
9
40
15
23
December
23.7
18
30
24
22
Average
15.3
10.3
17.4
17.3
13.1
16.5
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
4.1
3
4
4
4
5
February
4.7
3
4
4
6
5
March
6.4
9
5
7
6
April
6.7
7
6
6
7
May
5.8
5
6
5
6
June
5.1
5
5
5
5
July
4.7
4
4
6
4
August
4.3
3
4
6
5
September
4.2
4
4
4
5
October
4.1
3
4
3
5
November
3.6
3
4
3
4
December
3.5
2
3
4
3
Average
4.7
3.0
4.5
4.5
5.1
5.0
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
118°
069°
089°
064°
038°
February
232°
110°
058°
303°
055°
March
101°
282°
066°
004°
April
119°
003°
028°
047°
May
021°
041°
025°
006°
June
039°
031°
019°
330°
July
264°
009°
038°
052°
August
236°
277°
045°
025°
September
203°
275°
024°
047°
October
209°
159°
081°
064°
November
138°
276°
095°
060°
December
076°
327°
071°
108°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.