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
98.6
99
100
97
100
100
February
99.7
100
100
100
100
99
March
99.2
99
99
99
100
100
April
98.6
99
98
98
99
May
98.2
99
98
100
98
97
June
98.6
100
100
99
99
98
July
98.6
96
100
99
100
August
98.1
98
100
99
97
September
97.2
98
99
100
99
October
96.4
95
96
96
96
November
95.2
95
94
96
94
December
98.1
100
98
93
100
Average
98.2
99.1
98.1
98.2
98.1
98.0
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
30.8
30.0
31.8
30.0
31.6
30.3
February
32.3
31.8
33.7
31.6
32.0
32.7
March
33.8
33.0
35.1
33.1
32.8
33.5
April
34.4
37.0
35.6
33.1
33.3
May
33.6
33.1
35.3
34.7
32.8
33.1
June
33.0
32.7
33.7
33.7
32.6
32.8
July
32.8
32.7
33.1
32.7
32.7
August
32.6
32.8
32.8
32.3
32.5
September
32.0
31.8
31.8
31.6
32.1
October
31.8
32.2
33.0
31.1
32.2
November
30.6
30.1
29.6
30.8
29.8
December
29.9
29.5
30.5
28.3
29.8
Average
32.3
32.1
32.9
32.5
31.9
32.1
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
22.9
23.0
23.3
22.3
22.3
23.0
February
22.6
22.8
22.8
22.0
23.3
21.5
March
23.3
24.3
23.3
21.6
24.0
23.1
April
24.2
24.6
23.5
24.3
24.0
May
24.6
24.8
25.3
24.6
24.6
24.5
June
24.4
24.3
24.8
24.8
24.3
24.1
July
24.4
24.8
24.8
24.6
24.6
August
24.2
24.5
24.6
24.0
24.0
September
24.0
24.3
24.3
24.0
24.0
October
23.8
24.1
24.5
23.8
24.1
November
23.9
24.1
24.3
23.8
23.8
December
23.4
23.8
24.1
23.5
23.3
Average
23.8
23.8
24.2
23.8
23.9
23.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
8.5
8
6
14
5
7
February
3.1
5
0
4
12
0
March
2.1
4
1
1
5
2
April
3.4
1
2
4
5
May
5.4
8
2
6
8
5
June
4.6
5
5
5
4
3
July
6.1
5
6
4
8
August
6.1
7
4
5
5
September
11.8
18
15
10
11
October
10.1
7
4
18
8
November
18.5
23
23
15
22
December
14.7
11
21
34
14
Average
7.5
6.0
7.0
8.6
9.4
7.3
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
7.6
8
9
6
8
8
February
8.6
8
10
8
7
8
March
7.2
8
8
8
5
8
April
5.3
6
5
4
5
May
4.7
5
5
6
4
5
June
4.8
5
5
5
4
5
July
5.1
5
6
4
5
August
5.5
5
6
4
6
September
5.2
6
5
6
4
October
4.5
5
4
4
5
November
4.8
6
5
4
4
December
6.4
6
8
5
7
Average
5.9
6.7
6.2
6.1
4.9
5.7
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
050°
070°
057°
062°
067°
February
056°
067°
067°
066°
059°
March
054°
063°
067°
059°
062°
April
057°
059°
034°
229°
May
251°
213°
241°
256°
221°
June
230°
232°
242°
241°
238°
July
215°
244°
244°
242°
August
222°
241°
237°
242°
September
239°
233°
239°
238°
October
232°
237°
354°
252°
November
036°
036°
049°
044°
December
037°
061°
058°
052°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.