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
53.2
46
79
46
February
61.2
48
83
63
March
59.0
65
58
57
April
35.7
40
33
May
45.4
43
50
June
68.7
55
100
July
70.8
69
75
August
66.6
79
46
September
71.4
80
50
October
52.0
53
50
November
70.0
65
77
December
54.0
47
86
Average
57.1
50.6
63.2
57.4
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
5.9
5
7
6
February
7.8
9
7
7
March
7.0
9
7
6
April
8.1
8
8
May
12.1
11
14
June
15.7
17
13
July
16.4
17
15
August
17.8
16
20
September
13.7
18
8
October
12.5
13
12
November
8.0
8
8
December
3.9
5
1
Average
8.6
7.0
10.4
8.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
4.5
4
6
4
February
7.1
8
7
7
March
5.2
8
6
3
April
7.1
8
6
May
11.4
10
14
June
15.4
17
13
July
14.9
15
14
August
16.6
15
19
September
13.4
17
8
October
11.4
12
10
November
7.1
7
8
December
3.1
4
0
Average
7.6
6.1
9.5
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
44.0
56
42
34
February
48.9
43
25
75
March
37.3
29
45
34
April
71.4
80
67
May
13.6
21
0
June
25.0
9
60
July
58.3
67
33
August
33.3
37
27
September
35.7
30
50
October
56.0
58
50
November
47.5
61
29
December
45.9
50
29
Average
43.9
46.8
46.5
38.5
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
11.6
10
14
12
February
12.7
11
14
14
March
9.6
7
11
10
April
12.6
11
14
May
7.5
8
8
June
6.8
6
8
July
9.0
9
8
August
7.9
9
6
September
7.1
8
6
October
9.3
10
8
November
10.3
11
9
December
10.5
12
5
Average
10.0
9.8
10.5
9.9
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
249°
264°
252°
February
226°
270°
241°
March
173°
265°
135°
April
243°
229°
May
357°
244°
June
315°
203°
July
234°
317°
August
233°
332°
September
237°
019°
October
176°
208°
November
247°
164°
December
252°
056°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.