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
95.5
97
99
97
97
95
February
97.6
97
98
95
93
100
March
96.1
94
96
98
97
96
April
97.7
98
97
97
98
May
98.2
100
99
93
99
100
June
98.2
98
99
100
100
99
July
98.0
97
99
98
100
August
97.3
99
98
98
100
September
98.4
100
100
99
99
October
97.4
100
92
100
100
November
98.7
99
100
99
98
December
98.6
96
100
99
100
Average
97.7
97.1
98.2
97.3
97.9
98.5
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
31.9
32.6
33.0
32.2
31.6
31.6
February
32.1
32.1
32.6
31.8
32.1
32.6
March
31.6
32.2
32.1
32.5
32.1
31.3
April
31.4
32.0
31.6
31.8
31.5
May
31.2
31.6
31.5
30.3
31.6
31.1
June
30.3
30.8
30.6
30.3
31.6
30.8
July
30.1
30.3
30.3
31.0
30.8
August
30.2
31.3
30.1
31.0
31.3
September
31.1
32.2
30.8
31.8
31.6
October
31.2
32.3
30.0
32.8
31.6
November
32.2
33.0
31.8
33.2
32.6
December
32.7
32.6
33.1
32.2
32.3
Average
31.4
31.8
31.9
31.2
31.9
31.6
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
22.8
22.6
23.6
22.1
23.8
22.3
February
22.9
24.1
23.6
23.8
22.6
19.5
March
22.9
23.3
22.1
23.6
23.0
23.5
April
22.3
24.8
23.0
21.1
19.5
May
23.8
22.8
23.8
24.1
23.6
23.8
June
23.2
23.8
22.8
23.5
23.5
23.6
July
21.6
23.3
21.3
22.5
23.6
August
20.9
24.0
22.0
23.6
23.8
September
23.5
24.3
23.6
24.1
23.6
October
23.3
23.8
24.1
23.6
24.3
November
23.7
24.8
23.6
22.8
23.5
December
23.9
24.6
23.6
23.1
23.5
Average
22.9
23.3
23.8
23.2
23.1
22.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
6.5
3
3
8
7
12
February
4.9
6
2
10
11
8
March
6.7
5
12
4
5
9
April
4.3
3
6
6
9
May
1.8
3
1
7
2
1
June
2.4
4
2
0
0
5
July
1.5
0
1
3
1
August
2.5
2
0
2
0
September
1.6
1
0
1
1
October
3.9
0
15
1
1
November
2.2
2
3
4
5
December
3.3
6
2
10
5
Average
3.5
4.0
2.8
4.5
4.1
4.6
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
10.0
8
9
10
10
11
February
10.9
9
9
11
10
11
March
9.6
8
8
10
10
10
April
9.5
9
9
9
9
May
10.8
8
10
10
10
12
June
12.0
9
12
12
10
12
July
13.0
12
12
13
12
August
13.7
12
16
13
13
September
13.5
12
15
11
13
October
11.9
12
13
11
11
November
11.3
10
11
11
11
December
10.4
8
10
10
11
Average
11.0
8.4
10.3
11.3
10.7
11.2
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
258°
286°
284°
293°
285°
February
298°
291°
298°
288°
300°
March
246°
280°
258°
268°
261°
April
182°
221°
223°
210°
May
174°
151°
168°
175°
160°
June
160°
152°
156°
168°
160°
July
154°
155°
158°
156°
August
153°
154°
161°
159°
September
157°
154°
173°
156°
October
162°
156°
183°
174°
November
169°
163°
187°
190°
December
255°
204°
227°
264°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.