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
97.1
98
100
94
97
95
February
95.3
55
99
92
99
93
March
94.2
78
98
95
94
94
April
96.4
99
96
93
99
May
98.0
100
93
99
98
June
97.6
100
93
97
98
July
97.8
99
95
97
97
August
96.5
100
86
98
95
September
96.1
99
79
96
99
October
97.7
100
93
97
97
November
98.2
99
94
99
99
December
97.7
100
98
97
95
Average
95.8
85.0
99.4
92.2
96.8
96.4
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
29.9
31.8
30.1
30.6
28.3
26.6
February
28.5
30.1
31.3
27.6
29.0
28.1
March
27.5
27.3
30.8
27.5
25.3
27.0
April
23.8
24.1
25.3
21.5
26.3
May
21.7
25.3
20.8
21.1
21.1
June
18.7
18.1
18.3
18.5
19.3
July
18.5
18.0
18.3
18.8
17.1
August
20.9
22.5
21.6
20.8
19.8
September
25.2
23.1
25.1
26.3
25.8
October
27.4
27.3
28.3
29.1
24.8
November
29.0
29.5
30.8
25.8
27.8
December
29.7
32.8
29.8
27.6
26.1
Average
25.5
29.4
26.1
25.3
24.2
24.1
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
15.5
17.1
15.5
14.1
13.5
16.3
February
14.9
16.6
14.4
14.5
13.5
14.4
March
12.6
15.1
13.0
12.0
11.5
11.0
April
8.3
9.0
6.0
7.2
7.9
May
3.1
4.2
3.7
2.7
1.1
June
-1.1
0.7
-1.1
-1.0
-1.4
July
-3.9
-4.3
-1.1
-1.7
-5.9
August
0.5
0.6
0.3
0.8
0.6
September
5.6
5.7
4.0
6.9
6.9
October
9.5
8.6
9.0
12.1
7.7
November
12.0
12.9
13.1
11.4
9.8
December
14.3
16.0
14.6
13.4
12.9
Average
8.6
16.1
8.0
7.4
7.4
6.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.2
2
1
0
5
9
February
4.3
1
1
6
0
7
March
2.7
1
1
2
6
4
April
3.2
4
0
7
1
May
1.3
0
4
3
0
June
0.4
2
0
1
0
July
0.1
0
0
0
0
August
0.6
0
0
0
4
September
0.3
1
1
1
1
October
1.4
0
2
1
3
November
1.4
1
0
3
3
December
3.2
0
4
3
8
Average
1.9
1.0
0.8
1.5
2.4
3.4
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
7.4
9
7
6
6
7
February
6.7
4
7
6
6
6
March
6.6
6
8
7
6
7
April
5.9
7
5
6
6
May
4.9
4
5
5
6
June
5.6
6
5
5
7
July
6.0
6
6
5
7
August
6.9
8
4
7
8
September
7.5
8
5
7
10
October
7.7
7
6
8
9
November
8.8
10
6
9
9
December
8.8
9
9
8
9
Average
7.0
7.1
7.3
5.8
6.4
7.5
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
357°
342°
005°
009°
023°
February
002°
325°
009°
340°
351°
March
001°
330°
002°
359°
319°
April
354°
325°
351°
286°
May
313°
355°
309°
297°
June
345°
330°
352°
318°
July
306°
318°
348°
316°
August
316°
348°
310°
321°
September
304°
307°
324°
332°
October
305°
325°
334°
321°
November
324°
350°
345°
307°
December
312°
345°
340°
353°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.