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
53.3
47
53
46
70
47
February
76.7
85
85
76
93
74
March
86.5
93
89
81
92
88
April
89.6
93
93
96
89
May
86.9
94
87
87
80
June
84.8
89
88
88
89
July
94.2
97
98
98
94
August
98.2
100
98
100
97
September
89.3
99
94
77
97
October
79.4
84
82
89
82
November
66.5
72
79
64
48
December
52.9
58
56
66
63
Average
79.9
75.0
84.9
81.9
86.0
79.8
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
10.4
11.5
11.1
10.5
10.9
9.4
February
12.8
11.5
12.6
13.6
11.0
17.0
March
18.3
16.6
19.5
18.1
22.0
18.3
April
23.0
23.3
24.0
23.3
20.1
May
25.8
26.8
26.3
25.1
25.1
June
28.2
27.3
27.6
29.3
29.1
July
32.8
33.5
32.2
35.2
32.2
August
34.8
37.6
33.7
38.8
31.0
September
28.4
36.0
29.5
27.1
30.5
October
20.7
21.6
21.6
22.5
21.3
November
16.5
16.6
18.6
19.1
13.9
December
10.8
10.4
12.0
10.0
12.0
Average
21.0
13.2
23.0
22.3
23.3
21.6
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
5.8
6.2
7.4
4.4
6.2
4.2
February
7.1
6.9
6.7
8.3
5.2
9.5
March
11.6
10.0
12.3
11.3
14.0
12.1
April
15.8
16.8
16.0
15.0
14.9
May
18.9
19.6
19.3
18.3
19.0
June
22.1
21.8
21.3
23.0
22.5
July
25.5
26.3
24.8
27.0
24.6
August
26.2
28.1
25.3
29.1
24.6
September
21.9
26.3
23.0
20.6
22.8
October
15.9
16.6
16.5
16.3
16.3
November
11.5
12.6
12.5
13.3
9.0
December
6.6
6.2
6.9
6.2
7.4
Average
14.9
7.7
16.7
15.8
16.5
15.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
15.0
20
19
16
11
15
February
11.7
15
13
11
12
11
March
14.4
17
8
21
16
14
April
15.9
18
13
14
14
May
13.8
15
7
23
12
June
18.1
23
18
14
11
July
9.2
8
13
3
11
August
5.5
2
5
3
17
September
16.7
5
14
22
6
October
20.7
14
23
10
19
November
13.5
20
8
6
20
December
12.4
17
5
3
12
Average
14.2
17.2
13.1
12.9
11.6
13.2
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
4.3
5
4
4
5
4
February
4.7
5
5
5
5
5
March
5.4
5
5
5
7
6
April
5.5
5
6
6
5
May
5.4
6
6
5
5
June
5.1
5
5
5
5
July
5.7
7
5
6
5
August
5.9
6
6
7
5
September
5.5
6
6
5
6
October
4.7
5
5
5
5
November
4.5
5
5
5
4
December
4.1
4
4
4
4
Average
5.1
4.9
5.3
5.2
5.4
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
030°
037°
080°
051°
062°
February
065°
040°
047°
055°
031°
March
015°
037°
031°
038°
041°
April
053°
024°
046°
032°
May
060°
042°
070°
063°
June
050°
084°
150°
036°
July
098°
086°
130°
063°
August
118°
051°
139°
062°
September
130°
029°
356°
105°
October
045°
026°
016°
010°
November
021°
036°
019°
028°
December
063°
040°
069°
060°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.