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
2025
2024
2023
2022
2021
January
25.5
50
14
33
41
22
February
48.9
82
39
58
58
42
March
49.8
80
63
34
51
42
April
58.2
50
50
66
39
May
70.9
68
66
67
67
56
June
51.1
60
61
44
35
July
25.5
14
24
13
22
August
30.8
41
31
38
34
September
32.4
45
14
36
25
October
37.4
44
34
58
43
November
19.3
16
7
50
16
December
19.2
36
16
28
10
Average
42.1
69.5
40.8
35.8
46.2
32.4
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
2025
2024
2023
2022
2021
January
27.8
28.6
28.1
28.5
25.8
28.8
February
31.4
33.0
31.6
32.8
29.8
30.8
March
35.9
36.8
36.3
34.2
37.6
35.7
April
39.6
37.6
36.7
41.6
39.1
May
40.8
37.2
40.2
39.5
41.7
38.7
June
36.7
37.7
38.2
37.6
33.7
July
31.0
31.0
31.5
29.6
31.5
August
30.5
31.1
31.3
31.1
31.3
September
31.3
31.6
31.3
31.3
30.6
October
32.3
32.8
33.5
31.1
32.2
November
29.9
29.6
30.1
29.6
29.8
December
27.5
27.8
27.3
28.8
27.1
Average
33.0
34.0
33.0
32.9
33.1
32.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
14.2
14.3
16.1
15.0
13.1
15.5
February
16.1
18.0
19.0
15.5
13.8
14.9
March
20.8
21.6
21.5
20.3
21.5
20.0
April
24.7
24.3
22.8
26.1
23.3
May
27.7
26.1
27.0
25.8
29.1
26.1
June
26.5
27.5
28.1
27.8
23.6
July
24.9
25.5
25.5
24.8
24.8
August
24.2
24.6
23.8
25.0
24.6
September
24.1
24.3
24.8
24.3
23.5
October
21.7
23.3
21.6
21.6
20.8
November
17.1
16.6
18.1
15.3
18.5
December
14.3
16.1
15.5
16.5
14.5
Average
21.2
20.0
22.1
21.4
21.8
20.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.4
0
0
1
1
0
February
0.2
0
0
0
1
0
March
0.8
0
0
2
0
3
April
0.4
2
1
0
0
May
0.5
2
0
2
1
1
June
4.1
1
8
2
6
July
14.6
16
14
23
12
August
15.1
13
8
14
7
September
6.4
3
9
7
8
October
1.0
1
0
2
1
November
0.1
0
0
0
0
December
0.7
0
2
0
0
Average
3.6
0.4
3.2
3.9
4.5
3.3
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
2025
2024
2023
2022
2021
January
3.1
3
3
3
4
3
February
3.7
4
4
3
4
3
March
4.0
4
4
4
4
4
April
4.6
4
4
4
4
May
5.5
5
5
5
6
6
June
6.0
6
7
6
6
July
5.5
6
5
5
5
August
5.3
5
6
5
5
September
3.7
5
4
4
4
October
2.5
3
3
3
3
November
2.3
3
2
2
3
December
2.7
3
3
3
3
Average
4.1
4.2
4.2
4.2
4.2
4.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
052°
091°
114°
066°
083°
February
005°
153°
025°
113°
064°
March
332°
174°
339°
022°
344°
April
272°
243°
240°
007°
May
233°
260°
305°
283°
250°
June
263°
283°
274°
261°
July
253°
268°
276°
254°
August
255°
280°
267°
264°
September
278°
273°
246°
222°
October
004°
349°
052°
024°
November
028°
060°
052°
056°
December
043°
058°
055°
073°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.