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
46.5
42
55
44
46
36
February
71.4
75
83
79
71
74
March
86.8
90
98
82
87
83
April
91.3
99
90
86
82
May
97.8
99
97
97
98
June
87.2
97
84
95
85
July
59.9
71
55
64
64
August
48.8
69
58
53
30
September
55.4
71
52
52
54
October
66.1
68
74
66
59
November
56.5
62
53
67
50
December
43.3
46
59
46
33
Average
67.2
69.2
77.1
69.2
70.2
62.3
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
2025
2024
2023
2022
2021
January
24.3
25.8
24.1
23.5
21.8
24.0
February
28.3
29.0
27.8
29.6
26.6
27.3
March
32.9
33.7
33.1
31.6
34.0
32.7
April
37.1
35.7
35.2
38.6
35.5
May
38.9
39.7
36.8
39.2
35.2
June
34.5
34.7
33.7
35.5
32.1
July
28.8
27.8
29.5
28.1
28.0
August
27.7
28.1
27.6
28.5
27.1
September
29.7
29.8
29.3
30.3
29.1
October
31.6
31.8
32.6
30.8
30.6
November
28.6
28.8
28.5
29.0
28.3
December
25.1
25.8
25.1
27.0
23.5
Average
30.5
29.5
30.6
30.3
30.9
29.4
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
11.2
11.4
12.0
10.1
9.3
10.9
February
13.8
14.4
13.9
13.0
12.1
12.3
March
17.7
18.1
16.1
16.8
18.3
16.8
April
22.4
22.3
20.3
21.8
19.5
May
26.0
25.6
22.8
25.3
23.0
June
24.1
24.8
24.1
24.8
22.6
July
23.3
23.6
23.3
22.8
22.5
August
22.5
22.6
22.1
22.3
22.3
September
21.5
22.1
22.3
21.8
22.6
October
19.8
20.5
19.0
19.0
18.5
November
15.8
15.0
15.6
14.5
15.5
December
13.0
12.4
14.5
14.1
12.0
Average
18.8
14.6
19.2
18.7
19.1
18.2
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
1
1
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.3
0
1
0
0
May
0.2
0
1
0
0
June
3.1
2
7
3
2
July
18.6
26
12
19
19
August
20.7
25
15
19
19
September
9.1
5
13
11
8
October
0.7
1
0
2
1
November
0.2
0
1
0
0
December
1.0
0
1
1
3
Average
4.2
5.3
4.6
5.0
4.5
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
5.2
4
5
6
5
7
February
5.2
4
6
4
5
5
March
5.4
4
5
5
5
5
April
6.4
6
6
6
5
May
8.2
7
7
9
8
June
8.9
8
9
10
9
July
8.0
8
7
7
9
August
7.7
7
9
7
8
September
5.5
5
6
6
7
October
4.3
4
4
5
5
November
4.8
4
5
4
7
December
5.4
5
6
5
5
Average
6.1
4.3
5.8
6.2
6.3
6.7
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
054°
069°
052°
042°
108°
February
345°
010°
003°
331°
031°
March
335°
273°
248°
336°
261°
April
261°
253°
291°
286°
May
281°
281°
280°
270°
June
267°
267°
270°
272°
July
262°
269°
274°
265°
August
256°
272°
263°
283°
September
283°
288°
287°
268°
October
065°
331°
064°
026°
November
065°
094°
069°
077°
December
072°
086°
076°
070°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.