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
91.6
98
80
95
90
83
February
91.5
95
83
93
86
90
March
89.4
85
77
89
87
April
89.6
85
88
91
88
May
90.0
83
80
92
92
June
91.0
89
83
94
89
July
90.8
84
85
93
89
August
91.3
84
83
93
94
September
92.9
88
89
98
94
October
91.5
87
85
95
95
November
87.5
89
81
93
92
December
87.4
84
75
94
93
Average
91.1
96.7
84.9
84.4
92.1
90.6
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
2021
January
30.3
29.6
30.8
30.8
28.0
28.3
February
29.5
28.1
33.3
28.3
30.5
27.8
March
29.0
32.1
28.3
26.3
28.1
April
25.9
26.1
27.3
23.3
28.1
May
24.4
26.8
24.1
22.5
23.6
June
21.6
20.6
22.8
19.6
21.3
July
21.6
23.3
20.8
21.6
19.8
August
24.8
26.1
24.8
24.1
24.0
September
28.6
28.1
29.0
28.6
28.5
October
30.2
30.1
30.8
31.1
27.8
November
30.9
31.3
32.0
27.6
31.6
December
30.6
32.2
31.6
28.6
27.3
Average
27.5
29.2
28.4
27.5
25.9
26.3
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
18.1
19.1
17.6
17.3
17.1
18.3
February
17.5
18.8
18.1
16.6
16.8
17.1
March
15.6
17.3
15.8
15.4
14.0
April
12.0
12.5
11.8
10.9
11.0
May
7.6
9.5
9.0
7.0
5.7
June
4.3
5.0
4.0
3.9
4.5
July
3.8
3.5
4.2
5.7
2.1
August
7.0
7.4
6.2
6.2
7.7
September
10.2
11.9
10.5
11.1
12.1
October
14.4
13.1
14.5
16.5
12.8
November
16.4
16.8
17.3
15.5
15.6
December
17.7
18.6
17.6
16.6
15.8
Average
12.8
19.0
12.6
12.0
11.7
11.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
1.8
5
1
0
2
4
February
3.6
6
0
4
0
8
March
1.8
0
0
4
0
April
1.8
1
0
5
0
May
0.3
0
0
1
0
June
0.3
0
0
1
2
July
0.1
0
0
1
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.6
0
1
1
0
November
1.3
3
1
3
0
December
2.4
2
2
2
2
Average
1.6
4.7
0.5
0.7
1.7
1.4
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
7.4
5
7
7
8
7
February
6.8
7
8
6
7
6
March
6.9
8
8
7
6
April
6.7
8
7
7
6
May
5.8
6
8
6
5
June
6.9
8
7
7
7
July
7.4
8
9
7
7
August
8.8
9
9
9
9
September
9.3
10
9
9
11
October
9.3
10
10
10
11
November
9.6
10
10
8
11
December
9.0
9
10
8
9
Average
7.6
5.1
8.4
8.2
7.8
8.1
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
025°
016°
040°
041°
047°
February
040°
009°
041°
033°
048°
March
012°
014°
032°
359°
April
022°
002°
030°
030°
May
035°
015°
023°
004°
June
028°
350°
049°
023°
July
332°
033°
030°
030°
August
013°
036°
021°
017°
September
002°
344°
023°
029°
October
020°
025°
025°
028°
November
011°
023°
014°
354°
December
006°
020°
021°
012°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.