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
43.7
50
42
38
February
41.8
34
46
51
March
52.1
49
53
55
April
79.6
82
77
May
72.5
67
79
June
73.1
71
76
July
75.3
86
50
August
67.5
67
68
September
72.4
79
69
October
55.3
44
77
November
65.3
59
79
December
34.6
27
45
Average
54.9
42.1
59.2
63.3
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
4.1
3
5
5
February
6.3
7
6
6
March
6.5
8
7
5
April
8.5
10
8
May
12.3
12
13
June
16.2
18
14
July
17.3
18
16
August
20.1
18
22
September
18.0
20
16
October
12.2
11
14
November
7.3
7
8
December
2.3
4
1
Average
9.2
5.6
11.4
10.6
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
2.5
0
4
4
February
4.2
5
3
5
March
3.5
5
3
3
April
5.6
5
6
May
9.1
8
10
June
11.5
12
11
July
13.1
14
13
August
15.3
14
16
September
12.0
14
10
October
9.7
9
11
November
5.4
4
7
December
0.3
2
-1
Average
6.2
3.1
7.7
7.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
40.6
41
46
31
February
47.4
59
22
53
March
29.6
32
42
7
April
38.9
39
39
May
11.7
15
8
June
11.1
5
20
July
36.2
35
40
August
7.7
12
3
September
20.6
9
28
October
41.5
56
14
November
37.3
39
33
December
40.0
46
32
Average
34.3
46.8
30.5
25.7
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
13.7
14
15
12
February
14.8
13
15
17
March
11.8
10
15
8
April
13.7
12
16
May
8.9
8
10
June
8.1
8
8
July
10.0
11
8
August
6.8
7
7
September
7.8
7
8
October
11.4
12
11
November
11.7
12
11
December
9.1
11
6
Average
11.3
12.3
11.4
10.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
230°
247°
236°
February
238°
254°
241°
March
170°
258°
096°
April
255°
248°
May
309°
245°
June
289°
250°
July
238°
264°
August
254°
033°
September
200°
237°
October
203°
225°
November
230°
167°
December
250°
108°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.