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
41.3
44
34
33
43
27
February
71.1
73
48
78
71
84
March
86.9
95
75
71
90
89
April
87.4
70
86
98
87
May
84.0
84
89
82
72
June
69.6
58
57
86
66
July
42.3
23
19
58
46
August
33.4
30
17
42
34
September
44.6
39
45
63
14
October
77.3
60
83
88
75
November
41.0
48
7
67
32
December
30.8
19
19
36
19
Average
60.2
70.2
49.5
50.5
69.5
53.1
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
23.3
24.6
23.6
22.6
21.8
23.6
February
27.9
28.8
27.0
30.0
27.3
29.3
March
32.4
33.2
32.0
30.6
34.8
34.6
April
37.0
35.7
34.7
39.7
37.5
May
38.8
40.7
37.0
39.7
36.2
June
36.1
37.2
33.7
37.7
33.7
July
31.5
32.0
32.0
30.6
32.3
August
30.0
29.5
30.6
29.6
30.8
September
31.3
31.3
32.2
32.1
30.1
October
32.6
32.7
33.3
31.6
31.3
November
28.7
29.6
28.6
29.5
27.3
December
23.7
23.3
24.1
26.5
22.3
Average
30.8
28.9
31.2
30.8
31.9
30.8
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
8.7
8.4
9.6
8.0
8.1
9.4
February
11.7
11.4
13.0
11.6
10.6
11.6
March
16.6
15.8
15.1
16.1
17.6
19.6
April
22.6
21.1
20.1
22.5
22.0
May
27.0
26.3
23.6
28.1
25.8
June
26.7
27.3
25.1
27.8
24.8
July
25.6
26.0
24.8
25.3
26.3
August
24.4
24.3
24.6
23.5
24.5
September
23.3
24.0
24.3
23.8
24.1
October
19.4
20.8
19.3
18.5
20.1
November
14.2
13.5
15.3
13.3
12.5
December
10.0
8.9
12.5
11.5
10.9
Average
18.4
11.9
19.1
18.8
19.5
19.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.2
0
0
0
2
0
February
0.0
0
0
0
0
0
March
0.1
0
0
1
0
0
April
0.2
1
0
0
0
May
0.5
0
0
0
4
June
3.3
2
8
1
1
July
8.6
5
6
12
11
August
12.5
26
1
15
6
September
5.9
6
8
1
6
October
1.1
3
0
2
1
November
0.7
0
0
0
5
December
1.5
1
2
0
3
Average
2.8
3.9
2.2
2.9
3.2
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
3.2
4
3
4
3
3
February
3.4
4
4
3
3
3
March
4.1
5
4
4
3
4
April
4.4
5
5
4
4
May
5.6
5
6
7
6
June
5.8
6
7
6
5
July
4.6
5
4
4
5
August
4.5
6
6
4
4
September
3.5
4
4
4
4
October
3.0
3
3
3
3
November
2.6
3
3
3
3
December
2.8
4
3
3
2
Average
4.0
4.1
4.3
4.3
4.1
3.9
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
068°
047°
036°
102°
092°
February
067°
360°
083°
199°
136°
March
329°
255°
167°
269°
288°
April
227°
241°
251°
302°
May
248°
232°
235°
243°
June
230°
213°
232°
251°
July
193°
204°
207°
216°
August
199°
217°
193°
223°
September
289°
253°
269°
092°
October
107°
247°
043°
003°
November
058°
064°
061°
063°
December
043°
040°
051°
040°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.