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
January
98.8
100
98
100
99
February
96.2
93
100
94
98
March
87.0
77
95
96
80
April
96.1
100
96
92
May
97.7
97
99
97
99
June
97.5
98
98
97
98
July
96.9
97
95
99
August
99.3
99
99
100
September
97.1
98
95
98
October
92.7
88
95
94
November
97.1
94
100
97
December
95.7
97
99
88
Average
95.6
92.9
97.0
96.7
95.6
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
January
14.7
15.0
16.0
13.6
14.4
February
15.2
14.5
17.8
12.8
15.8
March
16.0
14.1
17.6
19.0
13.1
April
19.1
20.1
20.0
17.3
May
22.2
22.1
21.8
21.3
23.5
June
26.8
28.6
25.1
25.6
27.8
July
28.7
28.8
27.6
29.6
August
29.6
29.3
28.8
30.6
September
24.9
24.8
23.6
26.1
October
22.3
21.5
22.1
23.3
November
18.4
17.6
18.8
18.8
December
14.6
14.9
15.0
13.5
Average
20.6
18.9
21.3
20.8
21.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
January
4.3
4.7
6.5
3.3
2.6
February
5.2
5.7
7.2
2.6
5.4
March
7.6
7.7
7.9
7.7
7.2
April
9.0
8.8
9.6
8.5
May
12.0
12.0
12.1
11.8
12.1
June
17.3
18.5
16.3
16.8
17.6
July
19.5
19.8
18.8
19.8
August
19.4
19.6
18.8
19.8
September
15.7
16.5
13.9
16.8
October
13.1
12.5
12.8
14.1
November
9.1
9.1
8.0
10.0
December
5.5
5.7
4.5
6.7
Average
11.1
9.7
11.8
10.8
11.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
January
2.1
2
3
1
2
February
3.9
1
3
9
3
March
11.5
13
5
2
26
April
4.7
5
1
8
May
3.4
2
0
9
3
June
2.1
0
1
5
3
July
1.6
2
2
1
August
0.8
0
1
1
September
3.7
3
3
5
October
4.1
8
0
5
November
3.7
7
0
4
December
3.0
0
1
11
Average
3.7
3.4
2.9
3.0
5.6
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
January
5.9
6
6
6
6
February
5.6
5
7
5
5
March
7.8
8
8
6
9
April
7.7
7
7
9
May
6.7
7
7
7
6
June
6.4
6
7
6
6
July
6.7
7
7
6
August
7.1
7
8
7
September
6.1
6
6
6
October
5.9
6
6
5
November
6.0
5
7
6
December
5.4
6
6
4
Average
6.5
6.4
6.7
6.4
6.5
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
January
292°
246°
312°
045°
February
126°
296°
070°
130°
March
040°
188°
120°
051°
April
128°
115°
065°
May
109°
121°
104°
113°
June
111°
117°
116°
116°
July
116°
111°
124°
August
113°
112°
141°
September
121°
106°
113°
October
080°
182°
118°
November
043°
237°
178°
December
332°
298°
107°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.