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
96.7
96
97
98
97
96
February
97.8
99
96
100
98
98
March
98.5
98
100
98
100
98
April
99.1
98
98
100
100
May
99.7
100
100
100
100
100
June
99.9
100
100
100
100
100
July
99.9
100
100
100
100
August
99.7
100
100
99
100
September
99.7
100
100
99
100
October
99.3
100
100
100
99
November
97.9
97
98
100
95
December
97.9
97
98
97
97
Average
99.0
98.7
98.8
99.1
99.2
98.7
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
11.8
14.6
12.4
14.1
10.3
13.4
February
13.0
9.9
15.3
12.3
13.0
14.0
March
15.7
18.3
17.3
15.5
10.8
13.5
April
20.3
23.1
18.6
20.6
18.6
May
25.4
25.8
24.8
23.8
26.1
25.6
June
30.5
32.7
33.7
29.8
29.8
28.8
July
33.0
34.6
34.5
32.7
32.7
August
33.0
34.3
33.1
32.1
33.2
September
28.6
29.5
29.8
27.6
27.6
October
23.5
24.3
24.8
22.8
21.6
November
18.6
17.1
19.8
19.6
18.5
December
14.2
14.3
16.3
16.1
13.0
Average
22.1
20.4
23.4
22.8
22.0
21.8
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
3.8
5.4
4.5
4.7
1.5
5.2
February
4.0
2.3
5.0
2.1
3.0
4.5
March
5.5
6.9
5.9
6.0
1.6
3.6
April
9.0
11.5
7.0
8.1
7.0
May
13.7
11.3
12.5
13.5
12.0
12.6
June
18.4
19.6
20.5
18.1
19.1
16.8
July
22.0
24.0
21.5
21.8
22.1
August
22.4
22.5
22.6
22.0
21.3
September
17.3
17.0
20.0
15.1
16.8
October
13.1
13.5
13.0
13.6
13.0
November
9.3
8.4
10.1
10.1
8.8
December
6.4
6.5
7.7
9.3
5.5
Average
11.8
9.1
12.6
12.3
11.6
11.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
9.7
3
6
9
7
14
February
6.4
11
3
1
10
6
March
5.2
2
6
6
8
9
April
3.9
1
6
3
4
May
2.3
5
1
1
1
1
June
0.7
0
0
1
1
2
July
0.1
0
0
0
0
August
0.0
0
0
0
0
September
0.5
0
0
1
0
October
1.2
0
1
0
2
November
6.4
7
9
6
7
December
10.7
14
7
10
13
Average
3.5
3.9
2.7
3.2
3.2
4.3
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
9.7
8
11
9
10
9
February
10.4
11
8
11
9
12
March
10.3
10
7
10
12
11
April
9.9
11
9
10
9
May
9.8
10
11
11
10
9
June
11.2
15
13
11
13
9
July
13.6
16
12
17
13
August
14.0
13
14
12
12
September
11.7
9
14
9
13
October
10.5
12
9
13
13
November
10.0
12
8
11
10
December
8.9
10
8
9
9
Average
10.9
10.7
11.2
10.6
11.4
10.8
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
073°
069°
083°
057°
144°
February
046°
074°
041°
068°
074°
March
045°
082°
070°
052°
064°
April
060°
329°
069°
060°
May
347°
057°
069°
050°
346°
June
056°
058°
061°
053°
046°
July
051°
052°
055°
049°
August
056°
065°
059°
057°
September
028°
058°
054°
054°
October
058°
053°
058°
059°
November
066°
203°
083°
076°
December
081°
075°
074°
083°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.