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
55.3
49
53
62
February
66.6
85
45
90
March
75.6
61
86
90
April
82.5
86
79
May
78.5
72
87
June
86.2
72
100
July
88.7
83
96
August
62.8
64
60
September
72.8
72
74
October
57.1
61
52
November
46.8
58
37
December
53.6
77
28
Average
66.0
61.3
68.7
68.2
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
6.0
7
4
7
March
10.5
10
10
11
April
11.4
11
12
May
18.1
15
20
June
23.0
22
24
July
24.0
23
26
August
21.0
19
25
September
18.4
21
17
October
13.2
13
13
November
6.7
7
7
December
1.8
3
0
Average
10.7
6.7
12.3
13.2
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
4.8
7
2
6
March
8.0
7
8
9
April
9.4
9
10
May
15.3
14
16
June
20.6
20
21
July
22.7
22
24
August
18.5
17
21
September
14.7
17
13
October
9.5
10
9
November
4.8
5
4
December
0.5
2
-2
Average
8.5
4.8
10.2
10.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
53.8
60
70
38
February
25.0
30
15
38
March
22.9
16
33
21
April
45.0
48
42
May
44.2
56
29
June
12.0
14
10
July
22.5
19
27
August
54.2
67
32
September
19.2
17
21
October
17.8
29
0
November
48.9
78
24
December
58.5
49
69
Average
34.0
31.0
41.5
29.5
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
7.7
7
7
9
February
6.7
7
4
11
March
7.4
5
11
5
April
6.6
6
8
May
4.9
6
4
June
6.9
8
6
July
7.0
8
6
August
5.4
6
4
September
4.5
4
5
October
3.8
5
2
November
4.9
7
3
December
4.9
6
4
Average
6.0
6.0
6.4
5.6
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
291°
268°
276°
February
268°
280°
268°
March
274°
288°
048°
April
343°
322°
May
333°
302°
June
315°
339°
July
272°
306°
August
266°
333°
September
282°
283°
October
303°
034°
November
275°
318°
December
266°
118°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.