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
79.9
82
70
91
68
84
February
84.8
84
80
89
80
83
March
91.5
96
93
89
95
96
April
93.7
97
94
86
99
May
92.7
91
94
96
92
June
93.7
93
96
95
94
July
95.6
93
96
98
96
August
97.0
96
96
97
98
September
93.8
91
94
95
92
October
89.1
84
92
92
94
November
88.2
86
91
90
84
December
74.2
70
61
81
79
Average
90.3
87.9
88.4
91.2
90.8
91.6
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
10.3
10.9
10.9
10.3
9.9
9.4
February
13.5
14.3
13.4
12.5
13.9
14.5
March
15.6
15.5
16.1
16.3
16.1
15.6
April
18.6
18.8
18.3
17.6
18.0
May
21.8
19.8
22.6
25.1
19.3
June
25.7
24.6
27.5
27.1
25.3
July
27.9
27.5
27.1
30.6
25.3
August
28.3
28.3
28.3
31.3
25.6
September
25.0
21.6
28.1
25.3
25.1
October
20.6
20.1
23.0
23.1
20.1
November
14.6
16.5
14.8
16.1
12.0
December
11.4
11.0
11.5
9.0
12.5
Average
18.8
13.5
19.0
20.0
20.8
18.6
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
3.5
3.7
4.5
4.0
1.9
2.6
February
4.7
5.0
6.4
2.1
5.2
6.7
March
6.5
6.5
7.2
7.5
7.0
5.2
April
8.4
8.5
8.5
8.1
7.2
May
11.5
11.1
12.3
13.1
9.5
June
15.4
14.6
17.1
16.1
15.3
July
16.9
16.6
16.6
17.3
16.1
August
16.7
16.5
17.0
18.8
15.5
September
14.1
13.3
16.5
14.1
15.1
October
11.5
12.3
12.3
14.5
9.5
November
6.7
8.5
8.0
8.4
4.7
December
5.0
4.7
6.0
2.5
4.7
Average
9.6
5.1
10.4
10.7
10.9
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
29.0
38
23
23
16
31
February
23.4
26
30
11
24
27
March
25.9
19
34
29
20
13
April
20.9
25
26
22
11
May
24.2
45
26
8
30
June
18.5
27
16
17
17
July
9.1
9
16
4
17
August
10.1
11
13
12
12
September
19.3
37
13
20
24
October
23.3
30
28
14
17
November
30.2
25
48
31
22
December
34.3
29
39
16
32
Average
21.9
26.9
26.7
23.0
16.2
20.3
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
7.6
9
7
7
6
9
February
7.8
7
8
7
8
9
March
8.9
9
9
8
9
8
April
8.0
9
8
9
8
May
7.7
8
8
7
8
June
7.0
7
7
7
6
July
7.0
7
8
7
7
August
6.7
7
8
6
7
September
6.9
8
7
8
6
October
7.1
7
8
7
6
November
7.2
7
9
7
6
December
7.5
7
8
7
7
Average
7.5
8.6
7.6
7.7
7.2
7.3
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
217°
158°
265°
359°
274°
February
132°
242°
038°
263°
161°
March
085°
216°
250°
108°
005°
April
299°
317°
287°
062°
May
262°
004°
327°
282°
June
315°
345°
314°
285°
July
300°
295°
004°
296°
August
315°
297°
331°
334°
September
278°
165°
289°
302°
October
169°
212°
166°
191°
November
126°
263°
217°
354°
December
339°
238°
070°
230°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.