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
40.0
18
57
35
February
44.0
42
47
44
March
34.5
24
58
24
April
50.0
56
48
May
50.0
50
June
81.8
86
75
July
52.3
56
40
August
72.7
72
75
September
47.6
55
40
October
33.3
28
44
November
26.8
29
24
December
21.6
24
19
Average
37.7
28.5
48.8
35.7
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
5.0
5
6
4
February
7.3
8
7
7
March
7.1
8
6
8
April
7.9
8
8
May
10.5
11
June
16.3
17
16
July
17.0
17
16
August
15.4
15
16
September
13.6
16
11
October
11.9
12
13
November
7.7
8
7
December
4.2
5
3
Average
8.4
7.3
9.8
8.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
4.0
4
5
3
February
6.5
8
6
6
March
4.7
8
4
3
April
6.9
7
7
May
9.3
9
June
16.3
17
16
July
15.2
15
15
August
14.8
15
16
September
12.1
16
8
October
11.1
11
12
November
7.3
8
7
December
2.8
4
1
Average
7.3
6.7
8.8
6.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
64.6
88
71
35
February
50.8
58
32
63
March
46.4
45
62
35
April
70.0
78
67
May
11.1
11
June
18.1
0
50
July
47.6
44
60
August
22.7
28
0
September
23.8
27
20
October
44.4
44
44
November
53.6
63
41
December
40.5
43
38
Average
49.5
60.0
45.5
43.0
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
7.6
9
9
6
February
7.3
7
5
11
March
5.5
5
8
4
April
9.3
8
10
May
4.3
4
June
5.2
5
6
July
6.9
7
6
August
4.1
4
3
September
4.4
6
3
October
5.0
5
5
November
6.1
6
6
December
5.7
7
4
Average
6.3
6.5
6.3
6.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
236°
262°
241°
February
214°
249°
223°
March
244°
317°
068°
April
285°
256°
May
035°
June
281°
222°
July
249°
306°
August
223°
348°
September
243°
198°
October
209°
217°
November
194°
128°
December
255°
063°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.