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
49.2
46
57
45
February
55.6
60
51
56
March
67.9
65
69
69
April
85.7
100
77
May
57.8
52
86
June
83.7
85
82
July
71.4
71
72
August
53.7
46
63
September
57.8
61
56
October
42.8
41
67
November
47.7
51
40
December
46.8
48
43
Average
57.6
57.0
56.6
59.3
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
5
6
5
February
7.0
8
6
7
March
7.1
8
6
7
April
8.6
9
9
May
15.0
14
17
June
19.6
19
20
July
18.5
18
19
August
21.9
19
25
September
15.1
17
14
October
11.7
12
11
November
7.1
7
7
December
2.8
5
-1
Average
9.2
6.8
9.9
11.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
3.5
3
4
4
February
5.1
7
4
5
March
4.5
6
4
4
April
6.9
8
6
May
13.3
11
17
June
17.9
17
19
July
16.2
17
16
August
20.1
17
24
September
12.0
14
11
October
10.1
10
11
November
5.6
6
6
December
1.1
3
-2
Average
7.3
4.9
8.1
9.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
56.7
57
63
51
February
53.5
48
35
72
March
40.6
46
48
17
April
45.7
54
41
May
52.6
55
43
June
16.2
30
0
July
47.6
54
44
August
40.2
54
23
September
28.0
13
38
October
63.2
67
0
November
46.5
52
32
December
54.4
59
43
Average
47.4
50.0
51.0
41.2
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
2024
2023
2022
January
9.8
11
10
9
February
11.0
8
10
14
March
8.4
9
9
6
April
10.1
8
11
May
6.2
5
10
June
6.4
7
6
July
7.5
8
7
August
7.3
8
6
September
4.7
5
5
October
7.0
7
3
November
7.8
8
7
December
8.0
9
5
Average
8.6
9.2
8.3
8.2
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
239°
245°
255°
February
238°
251°
238°
March
236°
261°
090°
April
283°
246°
May
275°
240°
June
316°
274°
July
236°
260°
August
229°
273°
September
252°
269°
October
121°
123°
November
227°
108°
December
240°
360°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.