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
57.1
73
44
60
February
62.0
83
41
82
March
59.3
49
79
50
April
59.0
56
62
May
73.3
66
80
June
84.6
92
79
July
77.6
73
94
August
85.5
88
83
September
67.5
57
73
October
42.8
48
32
November
65.2
69
61
December
40.7
60
24
Average
64.2
63.2
64.0
65.5
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
2.1
2
3
1
February
4.1
6
2
5
March
6.3
7
8
5
April
8.5
9
8
May
17.3
16
19
June
21.9
24
20
July
22.2
21
23
August
23.0
22
24
September
15.7
17
15
October
11.5
11
12
November
5.4
5
6
December
0.6
3
-2
Average
9.1
4.7
11.4
11.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
0.3
0
2
-1
February
2.6
5
1
3
March
5.0
5
7
4
April
7.4
7
8
May
14.8
14
16
June
19.7
22
17
July
20.3
18
23
August
20.2
19
22
September
13.6
16
12
October
8.6
8
9
November
3.9
4
5
December
-2.8
0
-3
Average
7.3
3.1
9.4
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
50.0
41
67
40
February
26.5
11
23
46
March
33.7
46
24
22
April
52.4
50
55
May
8.8
11
7
June
13.4
4
21
July
5.9
8
0
August
24.0
29
17
September
27.0
13
33
October
10.3
15
0
November
37.6
53
21
December
25.9
20
31
Average
29.3
36.7
26.1
25.2
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
8.0
9
8
8
February
9.1
8
8
12
March
8.0
6
12
6
April
8.1
7
9
May
5.5
5
6
June
6.2
8
5
July
7.1
7
6
August
6.1
7
4
September
5.1
4
6
October
3.7
4
2
November
7.0
9
5
December
3.6
5
3
Average
6.7
7.4
7.0
5.8
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
260°
300°
272°
February
248°
066°
255°
March
247°
261°
054°
April
266°
255°
May
028°
238°
June
308°
278°
July
254°
302°
August
260°
057°
September
250°
245°
October
222°
218°
November
260°
248°
December
244°
034°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.