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
89.1
99
87
98
97
87
February
88.1
100
84
99
87
87
March
93.4
100
95
100
93
77
April
97.8
99
100
100
99
May
99.2
99
99
100
100
June
98.8
98
98
100
100
July
98.4
99
98
100
99
August
98.2
98
95
100
98
September
98.8
99
96
100
100
October
98.8
100
99
100
98
November
99.5
100
100
100
100
December
97.4
100
100
100
94
Average
96.8
99.6
96.4
98.7
97.0
95.9
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
33.8
34.5
35.2
31.6
32.7
33.7
February
35.6
36.5
36.3
34.8
34.6
34.5
March
38.4
40.1
40.7
35.0
36.1
35.7
April
37.7
38.7
35.8
32.5
38.0
May
34.7
37.7
32.7
31.8
35.5
June
31.6
32.2
29.1
29.5
32.7
July
30.1
30.0
29.8
28.8
30.3
August
29.6
29.3
28.3
28.8
30.5
September
29.3
30.5
28.1
29.1
27.3
October
31.3
32.2
33.0
32.2
31.1
November
34.8
35.0
34.0
36.0
36.0
December
33.2
34.1
35.0
33.1
33.7
Average
31.9
37.0
34.3
32.5
32.4
33.3
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
20.6
20.8
20.3
22.8
19.1
20.8
February
22.9
23.8
24.3
26.3
21.5
22.8
March
27.5
27.5
29.3
28.1
29.0
27.1
April
28.3
29.3
29.3
28.5
26.8
May
27.3
29.1
28.3
27.3
27.3
June
25.1
24.8
26.5
26.0
25.3
July
24.1
24.5
25.3
25.3
24.1
August
24.1
24.5
25.6
24.5
23.0
September
24.5
24.6
25.1
25.0
24.6
October
25.6
24.8
26.1
26.8
26.1
November
24.5
23.3
24.8
25.8
24.8
December
21.4
21.5
21.3
24.3
20.8
Average
23.6
24.1
25.0
25.8
24.9
24.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
1
0
0
April
0.6
1
0
5
1
May
1.9
0
0
0
2
June
2.4
4
2
0
3
July
5.2
4
3
3
5
August
6.7
10
6
4
3
September
3.8
5
2
0
3
October
1.1
0
0
0
2
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
1.3
1.8
0.8
0.4
1.8
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
4.9
3
5
5
5
3
February
5.4
4
5
4
6
5
March
5.1
4
4
4
5
5
April
5.4
4
5
6
5
May
5.2
5
4
4
5
June
4.7
4
4
4
4
July
4.5
3
4
5
4
August
3.5
3
3
5
3
September
3.1
2
5
4
2
October
2.6
3
4
3
3
November
3.5
4
4
3
3
December
3.9
4
5
5
3
Average
4.6
3.7
3.8
4.4
4.5
3.6
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
021°
005°
012°
007°
020°
February
014°
014°
022°
019°
002°
March
059°
285°
306°
037°
001°
April
239°
216°
217°
207°
May
245°
217°
226°
204°
June
235°
220°
234°
214°
July
278°
242°
234°
272°
August
276°
235°
259°
224°
September
256°
242°
208°
213°
October
229°
255°
199°
162°
November
029°
273°
025°
188°
December
024°
358°
038°
007°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.