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
47.9
49
63
32
February
49.1
35
50
60
March
61.7
65
62
58
April
76.6
76
77
May
86.9
93
84
June
91.4
100
88
July
78.2
83
67
August
62.2
63
62
September
65.6
56
75
October
49.2
51
47
November
57.8
62
53
December
30.9
29
34
Average
57.1
47.7
62.6
61.1
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
4.3
3
5
5
February
5.9
6
5
7
March
7.1
8
7
6
April
8.2
8
8
May
14.9
14
16
June
19.3
21
19
July
19.1
20
19
August
20.5
19
22
September
16.0
17
15
October
12.7
13
13
November
6.7
7
7
December
2.3
4
-1
Average
9.0
5.7
10.6
10.9
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
2.7
2
3
3
February
3.5
5
2
4
March
4.1
6
4
2
April
6.1
7
6
May
12.1
11
13
June
16.7
19
15
July
15.4
15
16
August
18.5
18
20
September
13.5
15
13
October
10.6
10
11
November
4.7
4
5
December
0.5
3
-3
Average
6.9
4.0
8.3
8.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
53.6
53
48
60
February
50.0
48
49
53
March
31.1
19
47
8
April
36.8
27
44
May
23.8
19
26
June
8.5
5
10
July
27.6
26
31
August
23.5
26
21
September
20.8
11
29
October
35.9
49
13
November
26.3
40
11
December
48.1
47
50
Average
36.7
41.1
36.8
32.1
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
10.7
12
11
10
February
11.5
11
11
13
March
9.0
8
10
7
April
11.3
11
12
May
10.1
11
10
June
8.4
11
7
July
8.1
8
9
August
8.0
8
8
September
5.5
5
6
October
8.3
10
6
November
7.8
9
7
December
7.0
8
6
Average
9.4
10.5
9.2
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
265°
245°
259°
February
264°
262°
248°
March
242°
251°
320°
April
046°
244°
May
320°
257°
June
312°
283°
July
242°
280°
August
242°
324°
September
221°
263°
October
246°
236°
November
232°
182°
December
231°
265°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.