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
95.6
98
97
96
89
98
February
96.3
98
98
97
96
97
March
97.7
99
95
98
99
98
April
97.8
100
92
100
99
May
97.0
99
96
97
97
June
97.0
100
95
95
95
July
97.2
94
97
100
98
August
97.3
97
98
99
99
September
96.0
95
97
94
100
October
96.7
98
96
97
98
November
96.9
92
98
100
95
December
96.3
92
99
90
98
Average
96.9
98.2
96.1
96.6
96.2
97.4
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
29.5
29.8
30.3
27.8
28.6
30.1
February
29.5
31.3
30.1
29.1
29.8
29.5
March
29.8
30.8
30.1
29.8
30.1
30.0
April
27.7
30.0
26.1
28.5
26.5
May
25.5
28.1
25.1
24.1
25.3
June
24.7
26.8
23.8
23.8
23.8
July
25.0
25.1
24.8
26.6
23.8
August
25.7
27.5
27.1
25.1
26.5
September
29.4
31.6
31.0
24.8
30.8
October
28.8
29.3
29.1
28.3
26.8
November
28.8
28.5
31.0
27.6
29.1
December
29.7
29.3
32.0
28.1
29.0
Average
28.1
30.7
28.9
28.0
27.1
27.6
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
19.8
20.3
20.3
19.6
20.1
20.3
February
19.8
21.1
20.8
20.1
19.8
17.6
March
19.5
20.3
20.8
19.8
20.8
19.8
April
17.6
19.6
17.3
18.1
16.6
May
15.2
17.5
15.3
14.1
14.8
June
14.3
15.1
13.1
14.0
14.0
July
13.3
14.3
13.9
14.5
11.3
August
14.4
14.1
16.0
14.0
15.0
September
17.0
18.3
18.3
14.8
16.8
October
18.1
18.5
19.1
17.8
17.1
November
17.9
18.8
20.0
16.3
17.8
December
19.4
20.0
20.6
19.3
19.0
Average
17.5
20.5
18.1
17.8
16.9
16.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
7.7
4
4
8
16
3
February
6.2
3
5
3
9
5
March
3.1
1
6
5
4
2
April
2.8
1
8
0
2
May
2.9
2
3
3
3
June
3.1
0
8
2
2
July
2.3
6
2
0
3
August
3.8
2
2
3
2
September
3.7
2
4
10
1
October
6.4
3
3
5
10
November
5.5
12
4
2
6
December
5.9
11
1
9
7
Average
4.5
2.8
4.7
4.0
5.3
3.9
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
7.2
7
8
8
7
7
February
7.0
7
6
7
7
7
March
6.8
7
7
6
7
6
April
7.1
6
7
8
8
May
6.8
7
7
7
7
June
6.7
7
6
7
6
July
7.1
6
7
7
7
August
8.5
7
9
9
9
September
8.4
8
8
10
9
October
8.7
9
9
8
9
November
8.8
8
9
10
9
December
7.6
8
8
8
8
Average
7.5
6.9
7.3
7.5
7.9
7.6
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
061°
135°
054°
012°
004°
February
030°
141°
348°
114°
131°
March
134°
143°
076°
021°
345°
April
095°
135°
124°
140°
May
039°
123°
033°
135°
June
041°
070°
100°
110°
July
123°
103°
050°
103°
August
074°
101°
119°
120°
September
111°
075°
134°
137°
October
131°
115°
101°
128°
November
111°
104°
136°
134°
December
327°
122°
077°
126°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.