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
2024
2023
2022
2021
January
98.8
99
98
98
98
February
97.6
98
99
100
97
March
99.1
99
99
100
99
April
99.1
100
100
100
99
May
99.1
100
98
100
99
June
99.8
100
99
100
100
July
99.9
100
100
100
100
August
99.8
100
100
100
100
September
99.7
100
100
100
100
October
99.3
99
100
99
100
November
98.9
100
100
100
99
December
98.4
99
100
98
100
Average
99.2
99.5
99.3
99.7
99.2
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
2024
2023
2022
2021
January
12.3
14.4
12.5
12.1
11.1
February
14.3
16.1
13.5
15.0
15.1
March
16.0
16.8
16.3
15.1
15.4
April
19.1
20.8
18.0
18.3
17.3
May
23.1
23.6
22.3
26.0
22.0
June
28.9
29.0
27.8
32.1
28.8
July
32.2
34.2
32.7
33.2
31.5
August
32.1
34.1
31.3
31.8
31.8
September
27.2
26.3
29.5
27.1
28.8
October
22.8
22.8
25.6
24.1
21.5
November
17.4
17.6
18.1
18.0
17.3
December
13.6
13.5
14.8
14.9
13.1
Average
21.7
22.5
21.9
22.6
21.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
4.0
6.2
5.0
3.2
3.5
February
5.3
7.0
3.9
5.0
5.9
March
7.0
9.1
8.3
4.2
5.5
April
9.1
10.0
8.5
8.3
7.7
May
13.7
14.3
13.6
15.0
12.8
June
18.2
18.3
18.1
20.1
18.3
July
21.2
22.6
22.5
22.0
21.1
August
21.3
23.3
20.5
21.6
21.5
September
17.4
17.3
18.5
17.8
18.5
October
13.5
14.8
16.3
14.0
12.0
November
9.4
8.0
10.0
9.0
10.3
December
5.6
4.4
7.0
8.5
5.2
Average
12.2
13.0
12.7
12.5
11.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
7.5
8
9
6
18
February
7.0
8
4
1
6
March
6.6
9
5
3
4
April
5.3
4
9
3
6
May
6.0
5
12
2
3
June
1.3
2
2
0
1
July
0.5
1
0
0
1
August
1.2
0
3
1
1
September
2.4
4
1
2
1
October
4.4
9
4
2
3
November
9.5
4
9
6
14
December
10.2
8
5
16
12
Average
4.7
4.6
5.0
2.8
5.0
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
2024
2023
2022
2021
January
6.4
6
6
6
8
February
6.7
7
5
8
6
March
7.3
9
8
6
6
April
6.7
7
7
7
7
May
6.4
7
6
6
8
June
6.4
7
6
7
6
July
6.6
7
7
7
8
August
6.3
7
7
7
7
September
6.1
7
6
8
6
October
6.1
6
8
5
7
November
6.0
5
7
6
6
December
6.3
6
6
7
7
Average
6.5
6.6
6.5
6.6
6.7
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
074°
026°
053°
160°
February
162°
026°
003°
200°
March
179°
208°
317°
299°
April
207°
235°
233°
211°
May
221°
246°
239°
221°
June
230°
247°
252°
239°
July
234°
209°
262°
222°
August
236°
224°
248°
229°
September
194°
295°
206°
248°
October
172°
187°
251°
045°
November
004°
196°
029°
132°
December
025°
096°
167°
107°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.