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
95
99
100
February
99.0
100
99
100
97
98
March
97.3
91
100
100
94
April
99.2
100
94
100
100
May
99.7
99
100
100
100
June
98.7
100
97
97
97
July
99.1
98
96
100
99
August
99.4
100
100
100
100
September
99.2
100
99
97
100
October
99.2
100
100
99
99
November
99.2
100
100
99
100
December
99.2
100
99
100
100
Average
99.0
99.6
98.8
98.2
98.8
98.8
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
37.0
40.1
38.6
33.2
36.2
34.7
February
36.0
38.1
37.6
35.2
32.5
34.8
March
33.6
31.5
35.2
34.6
30.6
April
28.7
25.3
27.1
30.3
27.1
May
22.9
22.6
21.1
23.3
23.6
June
20.2
21.3
21.6
19.3
19.0
July
21.2
18.8
20.1
19.5
23.3
August
24.2
27.8
26.1
22.5
23.1
September
28.2
28.1
29.8
26.1
27.1
October
32.0
34.2
31.3
30.8
32.1
November
33.2
35.0
34.2
29.8
29.1
December
36.5
37.1
37.1
34.8
36.2
Average
30.5
39.1
29.8
29.3
28.1
28.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
23.5
22.5
24.8
21.6
23.1
22.0
February
21.2
22.5
23.6
19.6
17.3
21.1
March
18.8
21.0
18.8
17.3
18.5
April
12.9
9.0
13.4
14.1
10.0
May
7.1
7.0
4.2
9.3
7.4
June
4.5
6.2
7.2
4.9
4.7
July
4.1
3.1
5.2
1.1
7.2
August
6.6
9.9
7.0
5.5
5.2
September
11.4
12.5
10.5
10.9
11.6
October
16.2
17.1
12.4
16.3
17.1
November
18.9
20.6
19.8
16.5
16.3
December
21.4
22.6
19.6
19.5
20.5
Average
14.8
22.5
14.7
13.2
12.7
13.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.5
0
1
10
8
1
February
1.7
3
2
0
5
0
March
4.6
15
0
0
10
April
1.3
0
7
0
0
May
1.1
4
1
1
0
June
2.1
2
11
2
2
July
0.8
1
5
0
0
August
0.3
0
0
2
0
September
2.3
5
0
6
2
October
1.7
0
0
3
3
November
4.0
3
4
10
6
December
2.5
1
0
1
2
Average
2.1
1.6
2.7
3.2
3.2
2.2
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
9.8
11
6
10
10
11
February
10.8
12
12
12
9
11
March
9.9
10
10
9
9
April
9.8
11
10
9
10
May
9.5
10
10
9
9
June
8.3
7
7
9
8
July
8.5
9
8
9
9
August
9.4
9
9
10
10
September
10.6
11
10
11
11
October
10.6
11
11
12
11
November
9.9
11
9
10
9
December
9.9
10
10
9
10
Average
9.9
11.5
9.7
9.6
9.6
9.7
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
115°
146°
107°
115°
096°
February
113°
118°
098°
121°
086°
March
099°
101°
126°
110°
April
120°
110°
118°
119°
May
110°
119°
117°
107°
June
128°
105°
117°
145°
July
111°
114°
114°
295°
August
044°
100°
119°
116°
September
085°
103°
094°
106°
October
095°
122°
302°
073°
November
055°
068°
109°
142°
December
143°
142°
117°
113°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.