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
47.4
75
42
43
February
77.6
92
64
77
March
61.1
56
75
48
April
66.6
58
79
May
78.9
81
73
June
82.7
80
86
July
93.4
100
75
August
55.8
68
33
September
56.9
57
57
October
57.7
70
39
November
47.8
46
50
December
51.2
68
21
Average
66.6
73.8
68.4
57.5
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
2.5
4
3
1
February
4.6
7
3
3
March
7.1
8
6
9
April
6.1
6
7
May
12.2
12
12
June
19.3
21
17
July
19.6
20
18
August
16.8
17
18
September
13.7
17
12
October
11.0
10
12
November
4.4
4
4
December
0.5
3
-2
Average
8.2
5.7
10.2
8.7
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
1.5
3
1
0
February
3.7
6
3
2
March
4.3
4
5
4
April
4.4
4
5
May
10.5
10
11
June
18.0
20
15
July
17.7
18
17
August
14.4
15
14
September
11.2
15
9
October
8.9
8
11
November
3.4
3
4
December
-1.7
2
-2
Average
6.6
4.2
8.6
6.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
48.4
44
51
48
February
61.1
71
41
67
March
34.4
36
58
3
April
54.5
53
57
May
35.0
41
20
June
37.9
20
57
July
30.4
29
33
August
46.5
50
40
September
38.4
43
36
October
28.8
44
6
November
69.5
88
50
December
69.2
84
43
Average
46.7
50.7
48.9
40.3
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
12.5
18
11
12
February
15.0
13
13
18
March
11.2
9
16
7
April
12.6
12
14
May
5.3
5
6
June
8.0
7
9
July
8.1
9
7
August
8.6
11
5
September
6.3
5
7
October
5.6
7
3
November
7.7
10
5
December
8.4
11
4
Average
10.4
12.8
9.7
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
273°
274°
276°
February
273°
270°
269°
March
293°
276°
065°
April
304°
273°
May
025°
281°
June
324°
305°
July
295°
297°
August
309°
289°
September
293°
267°
October
264°
225°
November
281°
294°
December
267°
032°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.