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
66.4
71
59
79
82
85
February
79.5
83
72
85
85
72
March
83.4
78
82
85
84
April
91.3
93
72
95
98
May
85.1
88
58
95
84
June
82.8
38
94
94
79
July
72.1
0
93
89
86
August
77.9
77
56
98
97
September
79.3
91
0
85
95
October
76.7
85
0
90
87
November
64.3
71
0
77
77
December
62.4
63
81
57
Average
77.9
76.7
65.9
58.8
89.2
84.6
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
6.6
6.0
6.2
7.5
7.4
5.5
February
6.3
5.2
8.6
7.5
4.9
5.4
March
8.1
9.5
7.7
9.0
7.2
April
10.4
11.8
10.0
9.0
7.5
May
14.1
16.8
12.4
14.0
11.3
June
17.7
16.3
17.8
17.1
17.3
July
19.2
18.8
18.8
19.3
18.8
August
20.3
20.8
19.1
21.0
18.5
September
17.9
18.1
20.1
17.5
18.3
October
14.6
14.5
14.5
15.5
14.5
November
10.1
9.8
11.4
10.4
10.3
December
7.4
8.5
5.0
7.2
Average
12.2
5.6
13.4
13.7
12.7
11.8
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
3.7
3.0
3.0
4.7
4.5
2.9
February
3.2
2.1
5.9
4.9
1.9
1.8
March
4.7
6.7
4.2
4.5
4.5
April
6.9
8.3
7.0
6.0
5.2
May
10.4
13.0
9.9
9.4
8.3
June
13.7
12.5
14.0
12.9
13.9
July
15.7
15.6
16.0
15.5
16.5
August
16.3
16.6
15.6
15.3
16.0
September
14.5
14.9
16.3
13.6
15.3
October
11.0
10.6
10.5
12.1
10.8
November
6.8
6.0
7.4
7.2
7.7
December
4.4
5.2
1.5
3.9
Average
8.7
2.5
10.0
10.4
8.9
8.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
13.1
17
6
14
10
20
February
13.1
12
20
6
16
16
March
12.1
8
20
6
15
April
8.7
11
10
6
6
May
12.0
6
3
7
16
June
14.8
6
3
10
9
July
11.9
0
14
6
11
August
10.1
5
4
2
5
September
14.1
10
0
9
6
October
13.8
6
0
5
18
November
11.9
18
0
19
11
December
14.5
17
10
20
Average
12.5
14.6
8.3
6.1
8.0
11.9
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
18.9
18
20
20
18
16
February
18.3
16
18
16
24
17
March
16.5
16
17
13
17
April
15.3
18
16
16
16
May
13.6
13
13
13
14
June
13.1
14
13
11
12
July
13.5
14
15
14
13
August
13.5
13
14
12
15
September
14.1
15
13
15
12
October
17.9
15
18
18
19
November
17.9
17
21
19
17
December
18.0
20
15
17
Average
15.5
17.1
15.5
15.4
14.9
15.0
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
237°
319°
230°
272°
228°
February
155°
278°
276°
247°
159°
March
210°
250°
092°
267°
April
253°
019°
360°
342°
May
086°
017°
293°
267°
June
287°
018°
297°
352°
July
266°
249°
293°
314°
August
235°
262°
003°
310°
September
091°
195°
337°
237°
October
187°
303°
206°
213°
November
270°
265°
178°
259°
December
250°
146°
207°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.