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
95.8
96
96
92
92
0
February
94.6
97
97
96
93
100
March
90.8
93
95
90
89
0
April
85.6
93
82
83
0
May
78.3
89
80
77
81
0
June
81.7
87
90
80
74
0
July
77.6
76
83
84
0
August
83.2
81
89
74
67
September
90.1
90
92
85
0
October
93.1
91
94
92
0
November
94.0
93
93
92
50
December
95.3
97
93
97
100
Average
85.0
93.9
90.5
89.1
86.6
50.0
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
22.8
24.6
24.3
23.6
23.3
5.2
February
23.4
22.8
24.8
23.5
24.1
11.1
March
19.5
20.3
19.5
18.8
18.3
7.0
April
15.7
15.6
16.5
15.0
7.7
May
12.3
12.5
11.0
13.0
16.0
7.0
June
10.1
10.0
11.4
11.1
10.0
1.8
July
10.0
9.8
11.4
12.0
4.7
August
10.7
12.0
11.0
10.9
6.2
September
12.5
12.8
12.4
13.8
3.6
October
15.3
17.5
15.5
16.1
6.0
November
17.5
17.8
16.3
21.0
8.0
December
20.5
21.3
21.0
21.6
11.0
Average
15.2
18.0
16.5
16.1
16.6
6.2
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
10.9
8.5
9.0
9.3
9.5
5.2
February
11.1
9.4
8.6
9.3
9.3
11.1
March
8.6
7.9
7.2
7.5
7.2
7.0
April
6.9
5.2
8.0
5.5
7.0
May
5.1
4.4
1.1
4.9
2.7
6.2
June
4.1
3.1
6.0
3.7
1.1
1.1
July
3.7
1.6
4.2
2.7
4.0
August
4.0
2.2
3.5
2.5
6.2
September
4.5
3.9
4.2
3.3
3.5
October
6.7
5.5
5.0
5.2
5.7
November
8.9
7.7
6.2
8.4
8.0
December
10.4
6.2
8.3
8.9
9.6
Average
7.1
6.6
5.3
6.1
5.4
5.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
2.9
2
0
5
6
0
February
4.8
6
2
4
4
0
March
6.8
9
7
6
9
0
April
10.5
15
11
17
0
May
12.5
16
16
16
9
0
June
19.8
11
27
17
19
0
July
15.7
10
14
28
0
August
16.2
11
19
17
33
September
14.8
22
17
13
0
October
9.6
5
7
13
0
November
10.8
13
19
7
50
December
4.8
3
6
5
0
Average
10.6
6.9
10.0
11.0
11.8
20.0
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
6.0
6
6
5
6
0
February
6.0
6
6
6
7
7
March
5.7
6
6
5
7
0
April
4.7
6
4
5
0
May
4.5
6
5
5
4
1
June
5.5
5
7
6
5
0
July
5.4
5
7
6
0
August
5.6
6
6
5
9
September
6.2
7
6
6
0
October
6.5
5
7
7
0
November
6.6
7
7
6
4
December
6.0
6
6
6
0
Average
5.6
5.9
5.9
5.9
5.8
4.2
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
190°
183°
202°
255°
360°
February
221°
190°
190°
177°
189°
March
260°
298°
359°
230°
360°
April
346°
048°
339°
360°
May
006°
015°
010°
344°
360°
June
009°
014°
358°
017°
360°
July
051°
357°
007°
360°
August
007°
355°
322°
071°
September
345°
330°
297°
360°
October
186°
247°
250°
360°
November
320°
320°
195°
270°
December
180°
183°
299°
360°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.