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
90.8
88
91
92
89
97
February
82.2
95
92
84
74
61
March
77.5
76
90
59
82
88
April
84.6
95
82
89
86
May
90.1
93
92
87
74
June
98.9
98
99
100
98
July
96.4
99
89
99
96
August
98.3
100
99
100
99
September
92.3
95
89
91
93
October
94.2
95
91
97
93
November
89.1
85
94
91
75
December
92.1
86
91
95
95
Average
90.3
85.9
93.8
88.6
91.4
88.4
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
12.3
12.5
13.4
11.0
12.6
13.0
February
11.4
10.0
12.9
11.3
13.5
11.4
March
13.6
14.6
13.5
15.3
12.3
12.9
April
17.1
19.1
18.5
19.3
18.6
May
22.3
21.3
22.3
20.5
22.3
June
28.0
28.1
27.3
28.1
28.6
July
29.9
29.5
28.6
29.6
30.0
August
30.3
30.1
31.1
31.1
32.2
September
27.0
27.0
26.3
27.8
27.3
October
22.4
21.8
23.1
23.6
20.5
November
17.8
17.1
21.6
19.0
16.6
December
14.6
14.0
17.5
13.3
15.9
Average
19.7
12.5
20.7
21.2
21.2
20.8
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
5.7
6.5
7.2
4.5
5.0
4.9
February
5.7
4.4
6.7
5.0
6.9
6.7
March
8.3
8.0
8.5
10.0
7.5
7.5
April
11.4
12.8
12.5
12.0
12.6
May
16.2
15.8
16.5
14.5
16.6
June
21.7
22.1
21.5
21.6
22.3
July
24.0
23.6
23.3
23.1
24.3
August
23.9
24.3
24.6
24.1
24.8
September
21.2
21.1
20.8
21.3
20.8
October
16.2
15.8
16.6
18.1
14.6
November
11.6
11.4
13.5
12.1
10.0
December
8.3
7.5
10.0
9.1
8.0
Average
13.7
6.4
14.7
14.9
14.8
14.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
11.4
11
19
8
10
3
February
13.9
9
14
14
14
14
March
11.4
14
4
12
16
12
April
8.1
3
7
3
2
May
5.8
9
10
8
10
June
1.8
2
3
1
2
July
4.5
1
10
3
6
August
3.0
1
2
0
1
September
7.8
6
9
9
8
October
9.2
11
10
4
10
November
14.0
12
9
7
22
December
6.7
6
9
8
4
Average
8.1
11.2
6.7
8.3
6.3
7.2
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
4.7
5
5
4
5
5
February
5.0
7
5
4
5
5
March
5.3
5
4
5
7
6
April
5.3
6
5
5
5
May
5.0
4
5
5
5
June
5.2
5
5
6
5
July
5.1
4
5
6
6
August
5.1
5
5
6
5
September
4.9
6
5
5
5
October
4.3
5
4
6
5
November
3.9
4
4
5
4
December
4.4
5
4
5
5
Average
5.0
5.5
4.7
4.7
5.5
5.1
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°
349°
013°
004°
066°
February
360°
006°
060°
034°
050°
March
050°
068°
057°
009°
040°
April
031°
068°
052°
044°
May
045°
043°
038°
028°
June
035°
027°
046°
022°
July
021°
360°
006°
354°
August
015°
037°
020°
021°
September
348°
010°
015°
360°
October
016°
040°
350°
353°
November
015°
045°
039°
060°
December
026°
056°
339°
014°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.