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
66.9
67
64
70
February
66.6
73
41
85
March
66.3
74
57
April
72.9
77
71
May
84.3
79
100
June
97.1
100
94
July
76.3
71
86
August
67.7
77
54
September
64.1
70
60
October
69.2
69
70
November
61.5
56
69
December
41.1
37
48
Average
68.1
69.7
66.6
67.9
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
5.5
5
7
5
February
7.1
8
5
8
March
7.6
7
8
April
9.2
11
8
May
17.1
17
18
June
20.8
22
20
July
17.8
17
19
August
19.7
18
23
September
18.0
19
17
October
11.5
13
10
November
8.8
9
9
December
3.8
5
2
Average
10.2
6.5
12.4
11.6
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
4.2
4
5
3
February
5.7
7
3
7
March
5.5
5
6
April
7.2
9
6
May
16.1
15
18
June
19.3
21
17
July
16.8
16
18
August
17.5
16
20
September
15.1
17
13
October
10.7
12
9
November
7.6
8
7
December
2.8
4
1
Average
8.7
5.4
11.0
9.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
41.2
51
44
23
February
28.0
15
32
45
March
41.1
59
17
April
62.5
65
61
May
15.6
21
0
June
2.8
6
0
July
50.0
50
50
August
27.1
43
4
September
16.9
17
17
October
11.5
19
0
November
38.4
44
31
December
54.9
70
33
Average
34.8
35.5
43.1
25.7
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
11.1
11
12
9
February
10.0
10
7
14
March
7.9
10
5
April
13.2
13
13
May
5.5
5
7
June
7.1
8
6
July
10.4
11
9
August
6.4
8
4
September
5.0
5
5
October
5.6
7
3
November
8.4
9
7
December
7.8
9
6
Average
9.1
10.7
9.1
7.4
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
241°
237°
273°
February
226°
276°
250°
March
257°
192°
April
233°
238°
May
035°
230°
June
260°
245°
July
226°
273°
August
246°
288°
September
185°
249°
October
205°
164°
November
232°
142°
December
266°
220°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.