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
92.9
91
93
96
94
90
February
93.9
93
93
95
95
94
March
92.5
95
94
92
88
93
April
93.8
96
94
93
95
May
96.6
95
99
96
96
96
June
94.8
93
98
94
95
94
July
96.9
99
98
97
97
August
97.3
99
97
97
98
September
98.6
98
99
99
100
October
98.2
99
99
96
100
November
93.7
96
96
93
93
December
94.5
94
97
96
92
Average
94.8
93.2
96.4
96.1
95.0
95.0
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
31.4
31.1
32.6
31.8
32.1
30.8
February
31.4
32.0
32.3
31.3
31.3
30.8
March
31.6
32.1
32.2
31.6
32.1
31.3
April
31.7
32.3
31.8
32.1
32.1
May
31.6
31.0
32.7
31.5
31.5
32.0
June
31.2
31.1
31.8
31.8
31.3
32.5
July
31.1
31.1
31.8
31.0
32.5
August
31.5
32.2
31.6
31.5
32.7
September
32.6
33.2
32.6
32.8
33.2
October
33.6
34.5
34.5
31.8
34.1
November
32.9
33.7
35.2
31.3
31.8
December
32.1
31.8
33.8
32.3
32.1
Average
31.5
31.4
32.5
32.4
31.7
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
24.1
23.8
25.1
22.3
24.6
23.6
February
24.3
25.0
25.1
21.6
24.6
24.3
March
24.6
24.3
25.5
23.8
24.8
23.8
April
25.0
26.0
24.3
24.3
24.8
May
24.8
25.3
24.6
24.3
25.3
24.3
June
24.6
24.8
24.8
24.3
24.3
24.3
July
23.1
23.1
23.1
23.0
23.3
August
22.7
21.8
22.5
23.0
24.0
September
23.4
22.3
22.6
24.1
24.3
October
24.9
25.5
25.0
24.6
25.1
November
24.5
24.8
23.5
23.8
24.8
December
24.9
24.3
25.6
25.0
24.1
Average
24.4
24.6
24.4
23.6
24.2
24.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
5.4
7
3
5
4
10
February
5.4
4
2
9
6
7
March
3.1
4
5
4
3
1
April
2.9
3
3
2
3
May
1.8
5
0
2
4
1
June
0.9
0
1
0
1
1
July
0.3
0
0
1
0
August
0.0
0
0
0
0
September
0.7
1
0
1
1
October
0.9
0
0
4
1
November
3.7
0
1
5
10
December
4.7
8
1
4
5
Average
3.9
3.9
1.9
1.9
2.7
3.1
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
7.8
7
7
8
9
7
February
8.3
8
6
10
8
10
March
6.7
7
8
6
6
7
April
6.1
6
6
6
7
May
6.8
6
7
7
7
7
June
6.8
6
7
7
6
7
July
7.2
7
7
7
7
August
8.2
8
9
8
8
September
8.1
8
9
7
8
October
7.6
8
9
6
7
November
6.4
7
7
5
6
December
6.4
7
6
5
6
Average
7.0
6.9
7.3
7.5
6.6
7.2
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
279°
288°
279°
277°
276°
February
281°
308°
271°
290°
274°
March
306°
309°
032°
344°
327°
April
072°
072°
071°
045°
May
072°
080°
076°
072°
076°
June
091°
078°
080°
074°
081°
July
078°
084°
080°
084°
August
076°
081°
076°
083°
September
074°
076°
074°
076°
October
078°
080°
065°
073°
November
061°
059°
057°
049°
December
278°
062°
057°
302°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.