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
30.0
39
28
27
February
40.7
36
52
41
March
51.0
61
44
57
April
53.2
39
69
May
72.0
70
74
June
34.2
47
26
July
57.8
50
75
August
50.7
46
78
September
53.5
58
48
October
34.1
34
35
November
37.2
40
35
December
33.3
35
32
Average
43.4
44.7
42.7
42.9
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
1.9
2
3
1
February
4.7
6
3
5
March
6.0
7
6
5
April
6.6
5
8
May
12.7
12
14
June
16.0
17
15
July
16.0
16
16
August
17.5
17
18
September
14.7
17
13
October
11.1
11
12
November
6.5
6
8
December
1.5
3
1
Average
8.0
4.9
9.6
9.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
0.5
0
2
0
February
2.5
3
2
2
March
3.3
4
4
3
April
4.2
3
6
May
10.5
10
11
June
13.3
15
12
July
14.2
13
16
August
14.1
11
18
September
11.8
14
10
October
7.5
7
8
November
3.9
3
5
December
-1.8
2
-2
Average
5.5
2.2
6.9
7.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
43.5
49
33
49
February
46.1
38
14
63
March
39.1
17
56
21
April
25.8
21
31
May
23.2
20
26
June
26.3
7
39
July
26.3
31
17
August
31.7
33
22
September
12.5
10
16
October
37.9
48
10
November
27.9
28
28
December
22.2
20
24
Average
34.0
34.2
32.9
35.0
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
9.0
10
11
7
February
11.4
11
9
13
March
10.4
9
12
9
April
9.6
8
12
May
7.6
7
8
June
6.7
6
7
July
7.7
8
7
August
8.0
8
7
September
9.0
9
9
October
7.9
8
7
November
9.5
11
8
December
5.7
7
5
Average
9.3
9.9
9.3
8.6
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
251°
248°
259°
February
239°
265°
246°
March
243°
250°
050°
April
253°
262°
May
041°
229°
June
112°
258°
July
237°
286°
August
249°
270°
September
225°
240°
October
216°
225°
November
240°
234°
December
217°
340°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.