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
98.7
100
99
99
99
100
February
98.9
99
99
99
100
97
March
98.6
99
100
100
99
99
April
98.6
99
99
100
98
May
98.2
100
100
95
99
99
June
98.9
100
98
98
99
99
July
99.2
98
99
99
99
August
99.6
100
99
100
100
September
98.6
98
97
100
100
October
99.4
100
100
100
100
November
98.5
99
99
100
99
December
97.8
99
99
100
99
Average
98.3
99.4
99.0
98.6
99.4
99.0
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
16.4
26.1
25.6
24.6
24.6
1.3
February
15.1
24.8
25.5
24.0
16.8
1.5
March
16.8
25.3
25.3
22.5
21.3
0.0
April
16.8
25.8
20.8
24.6
0.0
May
18.6
25.1
25.1
24.3
24.6
0.0
June
18.1
24.6
24.6
23.3
24.6
0.0
July
19.0
23.8
23.6
24.3
18.3
August
17.4
24.8
23.3
24.8
24.8
September
17.4
25.1
23.8
24.6
25.3
October
17.5
25.0
24.6
25.8
25.1
November
20.7
23.3
25.6
25.3
25.6
December
21.1
23.8
25.5
24.5
25.1
Average
18.9
25.2
24.8
23.8
23.8
12.3
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
9.2
14.4
15.0
13.1
15.4
0.0
February
8.1
12.9
14.4
14.8
9.9
0.0
March
8.9
15.3
16.1
3.3
11.8
0.0
April
8.6
15.8
2.7
15.4
0.0
May
11.0
15.4
15.5
13.0
14.1
0.0
June
10.3
14.8
15.0
10.4
13.8
0.0
July
9.7
14.4
6.0
14.3
10.8
August
9.3
13.5
13.5
9.1
14.0
September
9.5
14.9
10.5
11.0
15.5
October
8.8
12.6
8.0
13.8
15.5
November
10.6
11.5
11.1
15.4
15.8
December
11.2
7.5
13.0
15.9
16.3
Average
10.7
14.5
13.8
9.9
13.2
7.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
11.3
6
8
13
9
18
February
13.6
8
8
22
6
36
March
13.3
11
9
10
6
25
April
13.0
12
15
5
22
May
8.7
10
9
20
7
8
June
6.6
5
4
9
1
9
July
6.8
9
7
5
9
August
8.0
11
5
6
6
September
9.8
9
7
8
7
October
13.0
10
6
10
12
November
11.7
11
4
11
10
December
12.3
13
5
28
12
Average
9.1
7.9
9.4
10.1
8.0
14.2
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
6.9
8
8
8
6
6
February
7.0
8
9
8
6
6
March
6.6
8
8
8
6
6
April
6.7
7
8
8
6
May
6.5
7
7
8
6
6
June
6.5
7
8
7
6
5
July
6.6
8
8
6
5
August
7.2
7
10
6
5
September
7.5
8
10
7
5
October
7.2
8
9
8
6
November
7.6
9
9
8
5
December
7.5
8
8
7
7
Average
6.6
7.6
8.0
8.3
6.7
5.5
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
043°
270°
097°
263°
098°
February
057°
250°
206°
259°
253°
March
057°
264°
109°
090°
121°
April
049°
085°
262°
143°
May
048°
040°
248°
035°
278°
June
033°
264°
215°
093°
013°
July
251°
263°
119°
112°
August
305°
263°
277°
298°
September
168°
256°
107°
171°
October
061°
239°
098°
146°
November
050°
243°
116°
099°
December
057°
265°
239°
275°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.