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
92.1
91
92
97
97
87
February
93.0
97
87
94
96
91
March
91.7
93
88
91
94
94
April
92.1
88
94
93
97
May
89.7
95
70
86
95
89
June
91.7
97
97
96
95
July
93.3
95
95
99
86
August
91.6
99
97
92
89
September
92.3
76
94
95
90
October
93.1
92
83
94
94
November
93.1
95
94
93
99
December
92.7
93
94
86
83
Average
92.2
94.1
89.0
92.9
94.5
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
6.8
6.2
6.7
7.7
8.1
4.0
February
8.1
7.7
9.0
9.4
8.5
6.9
March
9.6
11.3
9.4
9.1
11.4
10.3
April
11.8
12.1
11.4
12.1
11.0
May
15.5
17.0
16.0
15.6
15.5
12.9
June
17.6
17.3
18.8
18.1
18.1
July
19.4
18.6
18.6
21.1
20.3
August
18.7
19.1
18.8
19.8
18.8
September
16.5
15.0
18.1
17.3
17.6
October
13.1
13.5
12.9
14.0
13.5
November
9.6
9.9
8.9
10.8
10.5
December
7.4
9.5
8.0
4.5
7.2
Average
12.6
10.6
13.0
13.1
13.7
12.6
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
1.1
0.1
1.3
1.6
2.5
-2.6
February
1.8
2.3
2.9
3.2
2.2
1.3
March
2.2
3.0
2.9
1.5
1.0
3.3
April
3.0
4.4
3.0
3.5
-1.6
May
6.5
5.7
9.5
6.5
7.9
4.5
June
9.6
8.9
10.5
9.4
9.5
July
11.1
10.5
10.9
11.8
12.4
August
10.9
11.1
11.5
10.9
11.0
September
8.6
8.1
9.8
8.8
9.6
October
6.4
6.5
6.5
7.9
7.2
November
3.3
3.1
2.5
4.5
3.7
December
1.9
4.0
2.9
-3.6
2.1
Average
5.3
2.8
6.1
5.9
5.9
5.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
13.7
12
14
19
7
25
February
20.3
16
20
13
26
32
March
15.5
5
25
19
10
11
April
11.4
22
12
10
9
May
11.2
4
17
7
14
20
June
11.8
12
10
9
5
July
13.1
11
16
9
9
August
13.4
13
6
13
11
September
12.1
11
16
11
8
October
19.0
13
24
22
27
November
15.4
4
16
22
9
December
21.0
21
30
13
22
Average
13.6
8.1
15.0
14.4
13.0
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
9.1
8
9
10
11
7
February
11.2
10
11
10
14
12
March
9.9
9
10
8
8
11
April
9.1
10
8
9
7
May
8.3
9
7
7
10
7
June
8.7
8
8
10
9
July
8.1
8
9
9
6
August
8.8
11
8
9
7
September
8.5
8
9
8
8
October
9.7
9
10
11
9
November
7.9
6
6
9
9
December
8.6
10
10
6
8
Average
8.9
9.0
8.8
8.4
9.3
8.0
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
241°
237°
239°
240°
249°
February
190°
242°
248°
245°
164°
March
254°
110°
231°
154°
239°
April
235°
065°
036°
341°
May
300°
056°
004°
242°
054°
June
256°
061°
230°
248°
July
249°
250°
252°
008°
August
235°
241°
252°
226°
September
036°
237°
309°
238°
October
227°
230°
227°
233°
November
245°
265°
210°
251°
December
249°
238°
232°
231°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.