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
94.3
90
97
89
97
99
February
93.2
96
86
91
93
90
March
94.3
88
92
96
93
95
April
96.4
98
94
97
99
May
97.4
97
95
97
100
June
98.9
100
95
100
100
July
99.5
99
99
99
100
August
99.0
100
100
98
100
September
97.5
95
96
97
98
October
92.6
92
93
88
97
November
93.5
95
96
95
91
December
94.3
88
93
97
99
Average
95.8
91.1
95.4
95.0
96.0
97.6
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
12.7
14.8
14.9
13.0
11.9
13.0
February
14.2
14.4
16.6
12.9
13.5
14.8
March
16.0
17.3
17.3
15.5
13.0
15.0
April
19.2
22.1
17.5
18.3
17.1
May
24.0
26.1
22.8
26.0
24.1
June
30.1
33.1
28.3
31.8
30.8
July
33.0
34.8
34.6
33.1
33.5
August
33.0
35.1
32.8
31.6
33.2
September
28.3
28.8
31.6
27.3
27.6
October
23.0
23.5
26.0
21.8
21.1
November
18.3
18.0
19.6
17.8
18.0
December
14.4
14.0
15.6
15.1
13.5
Average
21.5
15.5
23.7
22.6
22.0
21.9
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
4.5
7.4
6.0
4.7
3.7
5.9
February
5.1
5.7
6.2
3.2
4.5
6.7
March
6.4
8.8
8.0
5.9
3.0
5.2
April
8.5
9.5
8.3
8.0
6.9
May
13.1
15.8
14.0
13.0
12.5
June
18.4
20.6
17.8
20.5
17.3
July
20.4
22.5
21.3
21.1
20.8
August
21.2
23.0
21.6
21.5
21.3
September
18.2
19.6
21.0
17.3
17.3
October
13.0
13.6
15.4
12.3
11.8
November
9.7
7.0
11.0
9.0
11.0
December
6.2
5.2
6.7
9.0
5.4
Average
11.5
7.3
13.1
12.6
12.0
11.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
7.5
10
4
13
1
9
February
5.9
3
5
1
7
9
March
6.0
8
5
5
7
7
April
5.4
4
11
2
9
May
3.4
2
11
1
1
June
1.1
1
3
0
0
July
0.2
0
0
0
0
August
0.3
0
1
0
1
September
1.0
1
1
2
2
October
3.1
1
3
4
4
November
6.7
3
6
6
6
December
6.5
11
2
15
4
Average
4.0
7.1
2.7
4.6
2.8
3.7
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
8.6
8
9
8
9
9
February
9.0
7
9
8
9
10
March
9.0
10
10
6
8
10
April
8.6
8
8
10
9
May
8.3
9
8
8
9
June
7.4
5
7
8
8
July
8.0
9
5
9
8
August
8.1
8
9
9
8
September
8.1
8
9
9
7
October
7.3
8
5
8
7
November
8.1
8
9
7
9
December
8.5
8
7
9
9
Average
8.2
8.1
8.1
7.4
8.6
8.4
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
161°
336°
270°
348°
269°
February
118°
171°
346°
330°
326°
March
146°
191°
294°
360°
329°
April
311°
298°
304°
273°
May
181°
087°
066°
281°
June
355°
341°
347°
341°
July
355°
346°
344°
343°
August
357°
340°
345°
337°
September
255°
008°
261°
345°
October
026°
351°
345°
327°
November
335°
228°
246°
164°
December
335°
306°
162°
312°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.