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
2024
2023
2022
January
60.3
69
65
51
February
75.9
70
79
77
March
65.7
86
54
79
April
77.3
74
81
May
76.9
79
76
June
68.7
74
67
July
84.4
82
88
August
62.8
58
73
September
77.0
77
77
October
80.7
85
77
November
80.4
86
72
December
67.8
73
62
Average
72.1
73.3
71.0
72.0
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
2024
2023
2022
January
4.9
4
6
5
February
8.0
9
7
8
March
9.0
10
8
10
April
10.2
10
10
May
18.1
17
19
June
21.7
24
21
July
22.2
21
23
August
22.3
20
25
September
18.5
21
17
October
14.6
13
16
November
8.8
8
9
December
3.9
7
1
Average
10.9
6.9
12.6
13.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
3.7
3
4
4
February
6.4
8
5
7
March
7.5
9
6
8
April
8.8
8
10
May
16.0
14
17
June
19.9
22
19
July
21.3
20
23
August
21.0
18
25
September
16.7
19
15
October
14.0
13
15
November
7.9
7
9
December
3.2
6
0
Average
9.7
6.0
11.1
12.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
40.5
62
43
27
February
42.1
45
25
54
March
48.6
21
70
21
April
43.3
33
54
May
20.0
18
22
June
28.1
0
40
July
13.7
12
16
August
38.4
46
23
September
42.6
37
48
October
34.6
54
15
November
52.1
68
28
December
25.0
27
23
Average
39.3
46.6
38.4
33.0
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
2024
2023
2022
January
9.4
11
9
9
February
13.7
10
11
18
March
9.3
8
11
8
April
9.6
7
12
May
7.5
7
8
June
7.0
8
7
July
8.3
9
7
August
7.3
8
6
September
7.4
7
8
October
5.4
5
6
November
7.6
10
4
December
6.9
9
5
Average
8.9
9.6
8.4
8.8
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
242°
237°
258°
February
235°
264°
249°
March
221°
257°
341°
April
271°
256°
May
278°
223°
June
319°
246°
July
252°
276°
August
247°
308°
September
207°
257°
October
181°
148°
November
223°
197°
December
223°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.