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
2021
2020
January
84.1
84
81
88
100
100
February
85.8
69
97
94
100
80
March
79.8
68
98
83
83
0
April
66.2
65
63
0
0
May
73.0
72
72
100
100
June
74.3
70
81
100
67
July
75.3
74
81
80
43
August
95.6
97
96
100
100
September
86.8
73
94
100
100
October
100.0
100
100
100
0
November
98.0
100
100
100
100
December
97.9
96
100
100
100
Average
82.8
72.3
81.6
85.9
93.7
82.3
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
2021
2020
January
7.2
9
7
6
5
9
February
8.3
11
10
6
7
11
March
13.0
11
15
14
14
11
April
16.5
16
17
15
17
May
20.0
21
20
19
22
June
24.0
24
25
23
23
July
27.2
28
28
27
24
August
28.3
30
29
26
29
September
24.9
27
27
24
23
October
19.8
20
20
23
18
November
15.7
14
17
14
22
December
8.0
8
8
5
7
Average
16.9
10.4
18.2
18.5
17.9
19.3
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
4.6
7
4
2
3
9
February
5.8
8
6
2
6
9
March
10.3
9
12
10
14
11
April
14.9
14
15
15
17
May
18.4
19
18
19
20
June
22.1
22
22
22
23
July
25.5
25
25
26
24
August
26.7
27
27
25
29
September
23.9
25
25
24
23
October
17.5
17
17
23
18
November
13.0
10
15
14
22
December
6.0
6
5
5
7
Average
15.7
7.7
15.4
15.5
17.5
18.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
50.0
53
62
27
67
50
February
41.7
53
38
35
100
20
March
49.6
60
46
30
50
0
April
63.7
68
66
0
0
May
65.3
80
52
0
0
June
48.0
54
39
0
67
July
37.3
46
26
60
43
August
44.0
51
46
50
0
September
49.1
47
44
50
83
October
18.6
13
21
0
0
November
26.9
16
37
50
0
December
34.6
42
18
50
50
Average
43.1
55.9
50.8
37.1
50.0
41.1
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
2021
2020
January
10.6
9
14
9
11
7
February
9.2
9
6
12
16
12
March
8.4
8
8
10
8
0
April
8.7
11
6
0
0
May
9.2
10
7
7
10
June
7.7
7
9
8
7
July
7.9
6
9
7
11
August
8.7
12
6
6
10
September
7.5
7
9
5
6
October
9.1
10
9
10
0
November
10.0
11
10
9
9
December
11.9
12
12
14
15
Average
8.7
8.3
9.1
8.8
8.8
9.5
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
289°
288°
301°
293°
270°
February
041°
323°
301°
288°
277°
March
356°
042°
206°
110°
360°
April
129°
102°
360°
360°
May
123°
160°
108°
153°
June
125°
116°
109°
125°
July
124°
143°
173°
174°
August
112°
191°
180°
146°
September
071°
022°
119°
348°
October
287°
274°
319°
360°
November
283°
320°
255°
137°
December
303°
297°
300°
280°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.